CVE-2026-53239

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-25. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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:

xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()

Fix the race by pruning the bin while still holding xfrm_policy_lock, before dropping it. Use __xfrm_policy_inexact_prune_bin() directly since the lock is already held. The wrapper xfrm_policy_inexact_prune_bin() becomes unused and is removed.

Race:

CPU0 (XFRM_MSG_DELPOLICY) CPU1 (XFRM_MSG_NEWSPDINFO) ========================== ========================== xfrm_policy_bysel_ctx(): spin_lock_bh(xfrm_policy_lock) bin = xfrm_policy_inexact_lookup() __xfrm_policy_unlink(pol) spin_unlock_bh(xfrm_policy_lock) xfrm_policy_kill(ret) // wide window, lock not held xfrm_hash_rebuild(): spin_lock_bh(xfrm_policy_lock) __xfrm_policy_inexact_flush(): kfree_rcu(bin) // bin freed spin_unlock_bh(xfrm_policy_lock) xfrm_policy_inexact_prune_bin(bin) // UAF: bin is freed

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

June 25, 2026

Last Modified

September 8, 2026

Advisory Details (8)

Auto-updated Jun 28, 2026
No patch confirmed yet.
generic

xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ec82ea4eb220164d854f8734ca5a35e23e577b94
generic

xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c4c1ea36d83bf3c4569468ca5b8b614fda1bf821
generic

xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b5316e2b8614a87d8736941972441cb47bfd4491
generic

xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8fc536e9f6856230f19c7d13e71af064b6a77b22
generic

xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/88697cf980222d5906a37bf47662dac0732e2a0f
generic

xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7f2d76c9c03257c0782afef9d95321fa04096f60
generic

xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/42827d03f8009a6a218bacab153e21f39d6a121c
generic

xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/25c8c7fb3b0b9668c7d05e209f58c158d2b020c7

Vendor Advisories for CVE-2026-53239(2)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-08ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-08ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-08ubuntu

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

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)5.10.259-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)6.1.176-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)6.12.94-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (145 versions)7.0.13-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(3)

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 11× in last 7d / 85× 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 292 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-53239?
CVE-2026-53239 is a high vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: xfrm: policy: fix use-after-free on inexact bin in xfrmpolicybysel_ctx() Fix the race by pruning the bin while still holding xfrmpolicylock, before dropping it. Use xfrmpolicyinexactprunebin() directly since the lock is already…
When was CVE-2026-53239 disclosed?
CVE-2026-53239 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53239 actively exploited?
CVE-2026-53239 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 93.0% of all scored CVEs.
What is the CVSS score of CVE-2026-53239?
CVE-2026-53239 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-53239?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53239, 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.

Dependency Blast Radius

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