CVE-2023-52572

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2024-03-03. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

cifs: Fix UAF in cifs_demultiplex_thread()

There is a UAF when xfstests on cifs:

BUG: KASAN: use-after-free in smb2_is_network_name_deleted+0x27/0x160 Read of size 4 at addr ffff88810103fc08 by task cifsd/923

CPU: 1 PID: 923 Comm: cifsd Not tainted 6.1.0-rc4+ #45 ... Call Trace: dump_stack_lvl+0x34/0x44 print_report+0x171/0x472 kasan_report+0xad/0x130 kasan_check_range+0x145/0x1a0 smb2_is_network_name_deleted+0x27/0x160 cifs_demultiplex_thread.cold+0x172/0x5a4 kthread+0x165/0x1a0 ret_from_fork+0x1f/0x30

Allocated by task 923: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_slab_alloc+0x54/0x60 kmem_cache_alloc+0x147/0x320 mempool_alloc+0xe1/0x260 cifs_small_buf_get+0x24/0x60 allocate_buffers+0xa1/0x1c0 cifs_demultiplex_thread+0x199/0x10d0 kthread+0x165/0x1a0 ret_from_fork+0x1f/0x30

Freed by task 921: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x2a/0x40 ____kasan_slab_free+0x143/0x1b0 kmem_cache_free+0xe3/0x4d0 cifs_small_buf_release+0x29/0x90 SMB2_negotiate+0x8b7/0x1c60 smb2_negotiate+0x51/0x70 cifs_negotiate_protocol+0xf0/0x160 cifs_get_smb_ses+0x5fa/0x13c0 mount_get_conns+0x7a/0x750 cifs_mount+0x103/0xd00 cifs_smb3_do_mount+0x1dd/0xcb0 smb3_get_tree+0x1d5/0x300 vfs_get_tree+0x41/0xf0 path_mount+0x9b3/0xdd0 __x64_sys_mount+0x190/0x1d0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0

The UAF is because:

mount(pid: 921) | cifsd(pid: 923) -------------------------------|------------------------------- | cifs_demultiplex_thread SMB2_negotiate | cifs_send_recv | compound_send_recv | smb_send_rqst | wait_for_response | wait_event_state [1] | | standard_receive3 | cifs_handle_standard | handle_mid | mid->resp_buf = buf; [2] | dequeue_mid [3] KILL the process [4] | resp_iov[i].iov_base = buf | free_rsp_buf [5] | | is_network_name_deleted [6] | callback

  • After send request to server, wait the response until
mid->mid_state != SUBMITTED;
  • Receive response from server, and set it to mid;
  • Set the mid state to RECEIVED;
  • Kill the process, the mid state already RECEIVED, get 0;
  • Handle and release the negotiate response;
  • UAF.

It can be easily reproduce with add some delay in [3] - [6].

Only sync call has the problem since async call's callback is executed in cifsd process.

Add an extra state to mark the mid state to READY before wakeup the waitter, then it can get the resp safely.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

March 2, 2024

Last Modified

August 5, 2026

Advisory Details (7)

Auto-updated Aug 4, 2026
Patch available.
generic Patch Available

[SECURITY] [DLA 4178-1] linux security update

https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
generic

cifs: Fix UAF in cifs_demultiplex_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d527f51331cace562393a8038d870b3e9916686f
generic

cifs: Fix UAF in cifs_demultiplex_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/908b3b5e97d25e879de3d1f172a255665491c2c3
generic

cifs: Fix UAF in cifs_demultiplex_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/76569e3819e0bb59fc19b1b8688b017e627c268a
generic

cifs: Fix UAF in cifs_demultiplex_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fe87e2d0e6265859c659a3ef1e2559a83c5e8e68
generic

cifs: Fix UAF in cifs_demultiplex_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ed3b36f351d97dacb62cd0f399e8cf79f73bd30a
generic

cifs: Fix UAF in cifs_demultiplex_thread() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/99960d282fba6634fa758df4124cb73ef8a77d8a

Patch Availability(10)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-azure-lts-22.04 (5.15.0.1075.73) @ jammy2026-05-24ubuntu
ubuntulinux-tools-kvm-5.15 (5.15.0.1084.80) @ jammy2026-05-24ubuntu
ubuntulinux-tools-azure-edge (5.15.0.1078.87~20.04.1) @ focal2026-05-24ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.144.141) @ jammy2026-05-24ubuntu
ubuntulinux-tools-intel-iotg-edge (5.15.0.1083.89~20.04.1) @ focal2026-05-24ubuntu
ubuntulinux-tools-gcp-fips-5.15 (5.15.0.1087.77) @ jammy2026-05-24ubuntu
ubuntulinux-tools-realtime-5.15 (5.15.0.1088.92) @ jammy2026-05-24ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1083.81) @ jammy2026-05-24ubuntu
ubuntulinux-xilinx-zynqmp-tools-host (5.15.0-1052.56) @ jammy2026-05-24ubuntu
linuxKernel @ 5.4.297—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.

Weakness Classification(1)

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

All Vendor Advisories

(10)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 17× in last 7d / 51× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 127 total refreshes for this CVE.

  1. 2026-08-07 16:25 UTCEPSS rescore
  2. 2026-08-06 13:45 UTCEPSS rescore
  3. 2026-08-05 19:15 UTCEPSS rescore
  4. 2026-08-05 19:15 UTCEPSS rescore
  5. 2026-08-05 09:43 UTCEG score recompute
  6. 2026-08-05 09:43 UTCVendor advisory
  7. 2026-08-05 09:43 UTCGHSA enrichment
  8. 2026-08-04 12:21 UTCEG score recompute
  9. 2026-08-04 12:21 UTCVendor advisory
  10. 2026-08-04 12:21 UTCGHSA enrichment
  11. 2026-08-04 10:36 UTCEPSS rescore
  12. 2026-08-04 09:53 UTCEG score recompute
  13. 2026-08-04 09:53 UTCVendor advisory
  14. 2026-08-04 09:53 UTCGHSA enrichment
  15. 2026-08-03 10:34 UTCEPSS rescore
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  1. 2026-07-24 14:16 UTCEPSS rescore
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  3. 2026-07-23 02:29 UTCEG score recompute
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  5. 2026-07-22 14:07 UTCEPSS rescore
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  19. 2026-07-14 17:55 UTCOSV refresh
  20. 2026-07-13 22:28 UTCEPSS rescore
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  25. 2026-07-11 08:26 UTCEPSS rescore
  26. 2026-07-09 19:08 UTCEPSS rescore
  27. 2026-07-08 15:13 UTCEPSS rescore
  28. 2026-07-07 13:45 UTCEPSS rescore
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  30. 2026-07-06 16:26 UTCEPSS rescore
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  44. 2026-06-26 18:39 UTCOSV refresh
  45. 2026-06-25 13:48 UTCEPSS rescore
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  71. 2026-06-09 03:00 UTCOSV refresh
  72. 2026-06-08 14:16 UTCEPSS rescore
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  74. 2026-06-07 15:24 UTCEPSS rescore
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Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-52572?
CVE-2023-52572 is a high vulnerability published on March 2, 2024. In the Linux kernel, the following vulnerability has been resolved: cifs: Fix UAF in cifsdemultiplexthread() There is a UAF when xfstests on cifs: BUG: KASAN: use-after-free in smb2isnetworknamedeleted+0x27/0x160 Read of size 4 at addr ffff88810103fc08 by task cifsd/923 CPU: 1 PID: 923 Comm: cifsd…
When was CVE-2023-52572 disclosed?
CVE-2023-52572 was first published in the National Vulnerability Database on March 2, 2024, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-52572 actively exploited?
CVE-2023-52572 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 86.0% of all scored CVEs.
What is the CVSS score of CVE-2023-52572?
CVE-2023-52572 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2023-52572?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-52572, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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