CVE-2026-74436

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-15. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

rxrpc: serialize kernel accept preallocation with socket teardown

rxrpc_kernel_charge_accept() reads rx->backlog without any socket/backlog synchronization and passes that raw pointer into rxrpc_service_prealloc_one(). A concurrent rxrpc_discard_prealloc() sets rx->backlog = NULL and frees the backlog rings, so a kernel preallocation worker can keep using a freed struct rxrpc_backlog while updating *_backlog_head/tail and array slots.

Serialize the state check and backlog lookup with the socket lock, and reject kernel preallocation once teardown has disabled listening or discarded the service backlog.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.8%
EPSS %ILE
53rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 15, 2026

Last Modified

August 23, 2026

Advisory Details (8)

Auto-updated Oct 4, 2026
Patch available.
generic

rxrpc: serialize kernel accept preallocation with socket teardown - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5
generic

rxrpc: serialize kernel accept preallocation with socket teardown - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dc175389b18c29a5303ee83169ec653adfae3e17
generic

rxrpc: serialize kernel accept preallocation with socket teardown - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d6207326b4ca0ae1041281b6af9df53f8080669a
generic

rxrpc: serialize kernel accept preallocation with socket teardown - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c20d983968f239574290cf804a58cde18ad1c559
generic

rxrpc: serialize kernel accept preallocation with socket teardown - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/35a967ff8b24db09ee429c39c5b5e6571639997d
generic

rxrpc: serialize kernel accept preallocation with socket teardown - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1741378a7a83dfd8e53a9196730df709b903cd33
generic

rxrpc: serialize kernel accept preallocation with socket teardown - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/11b429b84c87cb5a0152f14e7d6cb649ed363901
generic

rxrpc: serialize kernel accept preallocation with socket teardown - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0337cdba0c477f176c0459bed012109453184573

Vendor Advisories for CVE-2026-74436(1)

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

Patch Availability(5)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1035.38) @ noble2026-10-05ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-34.34) @ resolute2026-10-05ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1014.14) @ resolute2026-10-05ubuntu
ubuntulinux-tools-oracle-edge (7.0.0-1012.12~24.04.1) @ noble2026-10-05ubuntu
ubuntulinux-tools-gke-hwe-26.04 (7.0.0-1007.8) @ resolute2026-10-05ubuntu

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 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (56 versions)
  • every version up to 6.1.187-1: fixed in 6.1.187-1
—
linux-6.126.12.100-1~deb12u1
  • every version up to 6.12.101-1~deb12u1: fixed in 6.12.101-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.12.96-1 (32 versions)
  • every version up to 6.12.101-1: fixed in 6.12.101-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (160 versions)
  • every version up to 7.1.5-1: fixed in 7.1.5-1
—

All Vendor Advisories

(5)

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 55× in last 7d / 236× 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 392 total refreshes for this CVE.

  1. 2026-10-05 06:47 UTCVendor advisory
  2. 2026-10-05 06:47 UTCGHSA enrichment
  3. 2026-10-05 02:23 UTCEG score recompute
  4. 2026-10-05 02:23 UTCVendor advisory
  5. 2026-10-05 02:23 UTCGHSA enrichment
  6. 2026-10-04 23:22 UTCEPSS rescore
  7. 2026-10-04 21:57 UTCVendor advisory
  8. 2026-10-04 21:57 UTCGHSA enrichment
  9. 2026-10-04 16:36 UTCVendor advisory
  10. 2026-10-04 16:36 UTCGHSA enrichment
  11. 2026-10-04 12:12 UTCVendor advisory
  12. 2026-10-04 12:11 UTCGHSA enrichment
  13. 2026-10-04 07:49 UTCVendor advisory
  14. 2026-10-04 07:48 UTCGHSA enrichment
  15. 2026-10-04 03:25 UTCVendor advisory
  16. 2026-10-04 03:25 UTCGHSA enrichment
  17. 2026-10-03 19:30 UTCEG score recompute
  18. 2026-10-03 19:30 UTCVendor advisory
  19. 2026-10-03 19:30 UTCGHSA enrichment
  20. 2026-10-03 14:26 UTCEPSS rescore
  21. 2026-10-03 02:09 UTCVendor advisory
  22. 2026-10-03 02:09 UTCGHSA enrichment
  23. 2026-10-02 21:45 UTCEG score recompute
  24. 2026-10-02 21:45 UTCVendor advisory
  25. 2026-10-02 21:45 UTCGHSA enrichment
Show 75 more
  1. 2026-10-02 15:51 UTCVendor advisory
  2. 2026-10-02 15:51 UTCGHSA enrichment
  3. 2026-10-02 07:03 UTCVendor advisory
  4. 2026-10-02 07:02 UTCGHSA enrichment
  5. 2026-10-02 02:01 UTCEG score recompute
  6. 2026-10-02 02:01 UTCVendor advisory
  7. 2026-10-02 02:00 UTCGHSA enrichment
  8. 2026-10-01 19:50 UTCEPSS rescore
  9. 2026-10-01 14:44 UTCVendor advisory
  10. 2026-10-01 14:43 UTCGHSA enrichment
  11. 2026-10-01 10:19 UTCVendor advisory
  12. 2026-10-01 10:19 UTCGHSA enrichment
  13. 2026-10-01 05:56 UTCVendor advisory
  14. 2026-10-01 05:56 UTCGHSA enrichment
  15. 2026-10-01 01:33 UTCVendor advisory
  16. 2026-10-01 01:33 UTCGHSA enrichment
  17. 2026-09-30 20:58 UTCEG score recompute
  18. 2026-09-30 20:58 UTCVendor advisory
  19. 2026-09-30 20:58 UTCGHSA enrichment
  20. 2026-09-29 15:24 UTCEPSS rescore
  21. 2026-09-29 08:35 UTCVendor advisory
  22. 2026-09-29 08:34 UTCGHSA enrichment
  23. 2026-09-29 04:08 UTCVendor advisory
  24. 2026-09-29 04:08 UTCGHSA enrichment
  25. 2026-09-28 23:44 UTCEG score recompute
  26. 2026-09-28 23:44 UTCVendor advisory
  27. 2026-09-28 23:44 UTCGHSA enrichment
  28. 2026-09-28 13:52 UTCEPSS rescore
  29. 2026-09-28 11:57 UTCVendor advisory
  30. 2026-09-28 11:56 UTCGHSA enrichment
  31. 2026-09-28 07:31 UTCVendor advisory
  32. 2026-09-28 07:31 UTCGHSA enrichment
  33. 2026-09-28 03:07 UTCVendor advisory
  34. 2026-09-28 03:06 UTCGHSA enrichment
  35. 2026-09-27 22:41 UTCVendor advisory
  36. 2026-09-27 22:41 UTCGHSA enrichment
  37. 2026-09-27 17:13 UTCEG score recompute
  38. 2026-09-27 17:13 UTCVendor advisory
  39. 2026-09-27 17:12 UTCGHSA enrichment
  40. 2026-09-27 13:48 UTCEPSS rescore
  41. 2026-09-27 12:49 UTCVendor advisory
  42. 2026-09-27 12:49 UTCGHSA enrichment
  43. 2026-09-27 08:26 UTCEG score recompute
  44. 2026-09-27 08:26 UTCVendor advisory
  45. 2026-09-27 08:26 UTCGHSA enrichment
  46. 2026-09-26 15:59 UTCEPSS rescore
  47. 2026-09-26 00:28 UTCEPSS rescore
  48. 2026-09-25 11:53 UTCVendor advisory
  49. 2026-09-25 11:53 UTCGHSA enrichment
  50. 2026-09-25 06:53 UTCVendor advisory
  51. 2026-09-25 06:53 UTCGHSA enrichment
  52. 2026-09-25 02:30 UTCVendor advisory
  53. 2026-09-25 02:30 UTCGHSA enrichment
  54. 2026-09-24 16:26 UTCEG score recompute
  55. 2026-09-24 16:26 UTCVendor advisory
  56. 2026-09-24 16:26 UTCGHSA enrichment
  57. 2026-09-24 14:04 UTCEPSS rescore
  58. 2026-09-24 09:42 UTCVendor advisory
  59. 2026-09-24 09:42 UTCGHSA enrichment
  60. 2026-09-24 05:19 UTCVendor advisory
  61. 2026-09-24 05:19 UTCGHSA enrichment
  62. 2026-09-24 00:55 UTCVendor advisory
  63. 2026-09-24 00:55 UTCGHSA enrichment
  64. 2026-09-23 20:32 UTCEG score recompute
  65. 2026-09-23 20:32 UTCVendor advisory
  66. 2026-09-23 20:32 UTCGHSA enrichment
  67. 2026-09-23 17:54 UTCEPSS rescore
  68. 2026-09-23 14:22 UTCVendor advisory
  69. 2026-09-23 14:22 UTCGHSA enrichment
  70. 2026-09-23 09:58 UTCVendor advisory
  71. 2026-09-23 09:58 UTCGHSA enrichment
  72. 2026-09-23 05:34 UTCVendor advisory
  73. 2026-09-23 05:34 UTCGHSA enrichment
  74. 2026-09-23 01:10 UTCVendor advisory
  75. 2026-09-23 01:10 UTCGHSA enrichment

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2026-74436?
CVE-2026-74436 is a critical vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: rxrpc: serialize kernel accept preallocation with socket teardown rxrpckernelcharge_accept() reads rx->backlog without any socket/backlog synchronization and passes that raw pointer into rxrpcservicepreallocone(). A concurrent…
When was CVE-2026-74436 disclosed?
CVE-2026-74436 was first published on August 15, 2026, with the most recent update on August 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74436 actively exploited?
CVE-2026-74436 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (53rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74436?
CVE-2026-74436 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-74436?
A fix for CVE-2026-74436 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-74436 are linked in the Vendor Advisories panel on this page.

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