CVE-2023-52885

HIGHNVD 7.87.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2024-07-14. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 5 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

SUNRPC: Fix UAF in svc_tcp_listen_data_ready()

After the listener svc_sock is freed, and before invoking svc_tcp_accept() for the established child sock, there is a window that the newsock retaining a freed listener svc_sock in sk_user_data which cloning from parent. In the race window, if data is received on the newsock, we will observe use-after-free report in svc_tcp_listen_data_ready().

Reproduce by two tasks:

  • while :; do rpc.nfsd 0 ; rpc.nfsd; done
  • while :; do echo "" | ncat -4 127.0.0.1 2049 ; done

KASAN report:

================================================================== BUG: KASAN: slab-use-after-free in svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc] Read of size 8 at addr ffff888139d96228 by task nc/102553 CPU: 7 PID: 102553 Comm: nc Not tainted 6.3.0+ #18 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020 Call Trace: dump_stack_lvl+0x33/0x50 print_address_description.constprop.0+0x27/0x310 print_report+0x3e/0x70 kasan_report+0xae/0xe0 svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc] tcp_data_queue+0x9f4/0x20e0 tcp_rcv_established+0x666/0x1f60 tcp_v4_do_rcv+0x51c/0x850 tcp_v4_rcv+0x23fc/0x2e80 ip_protocol_deliver_rcu+0x62/0x300 ip_local_deliver_finish+0x267/0x350 ip_local_deliver+0x18b/0x2d0 ip_rcv+0x2fb/0x370 __netif_receive_skb_one_core+0x166/0x1b0 process_backlog+0x24c/0x5e0 __napi_poll+0xa2/0x500 net_rx_action+0x854/0xc90 __do_softirq+0x1bb/0x5de do_softirq+0xcb/0x100 ...

Allocated by task 102371: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x7b/0x90 svc_setup_socket+0x52/0x4f0 [sunrpc] svc_addsock+0x20d/0x400 [sunrpc] __write_ports_addfd+0x209/0x390 [nfsd] write_ports+0x239/0x2c0 [nfsd] nfsctl_transaction_write+0xac/0x110 [nfsd] vfs_write+0x1c3/0xae0 ksys_write+0xed/0x1c0 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc

Freed by task 102551: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x2a/0x50 __kasan_slab_free+0x106/0x190 __kmem_cache_free+0x133/0x270 svc_xprt_free+0x1e2/0x350 [sunrpc] svc_xprt_destroy_all+0x25a/0x440 [sunrpc] nfsd_put+0x125/0x240 [nfsd] nfsd_svc+0x2cb/0x3c0 [nfsd] write_threads+0x1ac/0x2a0 [nfsd] nfsctl_transaction_write+0xac/0x110 [nfsd] vfs_write+0x1c3/0xae0 ksys_write+0xed/0x1c0 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc

Fix the UAF by simply doing nothing in svc_tcp_listen_data_ready() if state != TCP_LISTEN, that will avoid dereferencing svsk for all child socket.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity78% × 45%
Impact severity (EG Severity): CVSS 7.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
45th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.8): severity, escalated by confirmed exploitation. This CVE's 7.8 is its impact severity (EG Severity), not escalated.

EG Severity
7.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-20). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 14, 2024

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Aug 4, 2026
Patch available.
Web page

SUNRPC: Fix UAF in svc_tcp_listen_data_ready() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fc80fc2d4e39137869da3150ee169b40bf879287
Web page

SUNRPC: Fix UAF in svc_tcp_listen_data_ready() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7e1f989055622fd086c5dfb291fc72adf5660b6f
Web page

SUNRPC: Fix UAF in svc_tcp_listen_data_ready() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ef047411887ff0845afd642d6a687819308e1a4e
Web page

SUNRPC: Fix UAF in svc_tcp_listen_data_ready() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fbf4ace39b2e4f3833236afbb2336edbafd75eee
Web page

SUNRPC: Fix UAF in svc_tcp_listen_data_ready() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cd5ec3ee52ce4b7e283cc11facfa420c297c8065
Web page

SUNRPC: Fix UAF in svc_tcp_listen_data_ready() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/42725e5c1b181b757ba11d804443922982334d9b
Web page

SUNRPC: Fix UAF in svc_tcp_listen_data_ready() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dfc896c4a75cb8cd7cb2dfd9b469cf1e3f004254
Web page

SUNRPC: Fix UAF in svc_tcp_listen_data_ready() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c7b8c2d06e437639694abe76978e915cfb73f428

Vendor Advisories for CVE-2023-52885(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(10)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-virtual-hwe-16.04-edge (4.15.0.240.252~16.04.1) @ xenial2026-05-23ubuntu
ubuntulinux-tools-oracle (4.15.0.1145.156~16.04.1) @ xenial2026-05-23ubuntu
ubuntulinux-tools-gcp-fips-4.15 (4.15.0.2084.82) @ bionic2026-05-23ubuntu
ubuntulinux-tools-oracle-lts-18.04 (4.15.0.1145.150) @ bionic2026-05-23ubuntu
ubuntulinux-tools-azure (4.15.0.1191.206~14.04.1) @ trusty2026-05-23ubuntu
ubuntulowlatency-4.4 (4.4.0-243) @ xenial2026-05-23ubuntu
redhatkernel-0:4.18.0-372.118.1.el8_62024-08-13redhat
redhatkernel-0:5.14.0-284.77.1.el9_22024-08-07redhat
redhatkernel-rt-0:5.14.0-284.77.1.rt14.362.el9_22024-08-07redhat
linuxKernel @ 4.14.322 (fixes >=4.8.0)—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.103-1 ... 5.10.92-2 (33 versions)
  • every version up to 5.10.191-1: fixed in 5.10.191-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.27-1 ... 6.1.38-4~bpo11+1 (8 versions)
  • every version up to 6.1.52-1: fixed in 6.1.52-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.4.4-1: fixed in 6.4.4-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.4.4-1: fixed in 6.4.4-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(6)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 36× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 92 of 202 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 8 repeat rows among the latest 100 are merged into the row they repeat. The 110 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-23 16:29 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  2. 2026-10-22 16:31 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  3. 2026-10-21 16:29 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  4. 2026-10-20 21:18 UTCEG score recompute
  5. 2026-10-20 21:18 UTCVendor advisory
  6. 2026-10-20 21:18 UTCGHSA enrichmentGHSA-p7rj-mgww-3q4f · GitHub severity HIGH · GitHub CVSS 7.8
  7. 2026-10-20 16:30 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  8. 2026-10-19 16:29 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  9. 2026-10-19 14:55 UTCOSV refresh
  10. 2026-10-18 16:29 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  11. 2026-10-18 07:42 UTCEG score recompute
  12. 2026-10-17 16:30 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  13. 2026-10-16 16:36 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  14. 2026-10-15 16:29 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  15. 2026-10-14 16:30 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  16. 2026-10-13 16:30 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  17. 2026-10-12 18:13 UTCEG score recompute
  18. 2026-10-12 16:31 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  19. 2026-10-11 21:38 UTCEG score recompute
  20. 2026-10-11 13:45 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  21. 2026-10-10 19:58 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  22. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  23. 2026-10-08 17:06 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  24. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  25. 2026-10-06 15:15 UTCEPSS rescoreEPSS 0.6% · 44th percentile
Show 67 more
  1. 2026-10-05 17:41 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  2. 2026-10-04 23:20 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  3. 2026-10-03 14:23 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  4. 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  5. 2026-09-30 16:37 UTCEG score recompute
  6. 2026-09-30 15:01 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  7. 2026-09-29 15:17 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  8. 2026-09-28 13:49 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  9. 2026-09-26 21:11 UTCOSV refresh
  10. 2026-09-26 00:22 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  11. 2026-09-24 14:01 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  12. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  13. 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  14. 2026-09-18 19:26 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  15. 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  16. 2026-09-16 05:11 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  17. 2026-09-15 03:08 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  18. 2026-09-13 16:45 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  19. 2026-09-12 14:58 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  20. 2026-09-11 14:51 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  21. 2026-09-11 09:34 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  22. 2026-09-08 21:58 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  23. 2026-09-07 15:59 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  24. 2026-09-07 06:48 UTCOSV refresh
  25. 2026-09-06 13:46 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  26. 2026-09-05 15:26 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  27. 2026-09-04 13:58 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  28. 2026-09-04 05:04 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  29. 2026-09-02 14:10 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  30. 2026-09-01 13:52 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  31. 2026-09-01 04:36 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  32. 2026-08-30 19:15 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  33. 2026-08-30 01:20 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  34. 2026-08-28 21:39 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  35. 2026-08-27 14:23 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  36. 2026-08-26 14:44 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  37. 2026-08-25 13:47 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  38. 2026-08-23 00:17 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  39. 2026-08-21 23:47 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  40. 2026-08-20 22:53 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  41. 2026-08-20 16:31 UTCOSV refresh
  42. 2026-08-19 17:02 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  43. 2026-08-18 13:46 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  44. 2026-08-16 14:54 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  45. 2026-08-16 02:12 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  46. 2026-08-15 01:28 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  47. 2026-08-13 21:58 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  48. 2026-08-12 13:49 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  49. 2026-08-11 13:40 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  50. 2026-08-10 23:58 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  51. 2026-08-09 13:44 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  52. 2026-08-08 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  53. 2026-08-07 16:25 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  54. 2026-08-06 13:45 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  55. 2026-08-05 19:15 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  56. 2026-08-05 10:24 UTCEG score recompute
  57. 2026-08-05 10:24 UTCVendor advisory
  58. 2026-08-05 10:23 UTCGHSA enrichmentGHSA-p7rj-mgww-3q4f · GitHub severity HIGH · GitHub CVSS 7.8
  59. 2026-08-04 12:01 UTCEG score recompute
  60. 2026-08-04 12:01 UTCVendor advisory
  61. 2026-08-04 12:01 UTCGHSA enrichmentGHSA-p7rj-mgww-3q4f · GitHub severity HIGH · GitHub CVSS 7.8
  62. 2026-08-04 10:36 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  63. 2026-08-04 09:49 UTCEG score recompute
  64. 2026-08-04 09:49 UTCVendor advisory
  65. 2026-08-04 09:49 UTCGHSA enrichmentGHSA-p7rj-mgww-3q4f · GitHub severity HIGH · GitHub CVSS 7.8
  66. 2026-08-03 10:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  67. 2026-08-02 02:25 UTCEPSS rescoreEPSS 0.2% · 12th percentile

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-52885?
CVE-2023-52885 is a high-severity vulnerability; its CVE record was published on July 14, 2024. In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Fix UAF in svctcplistendataready() After the listener svcsock is freed, and before invoking svctcp_accept() for the established child sock, there is a window that the newsock retaining a freed listener svcsock in…
When was the CVE record for CVE-2023-52885 published?
The CVE record for CVE-2023-52885 was published on July 14, 2024. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 5, 2026; the record at its source may have been updated since.
Is CVE-2023-52885 actively exploited?
CVE-2023-52885 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-52885?
CVE-2023-52885 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2023-52885?
A fix for CVE-2023-52885 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2023-52885 are linked in the Vendor Advisories panel on this page.

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