CVE-2026-53239

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH 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
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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(high)
EPSS
3.3%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 30, 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.

Data Freshness Timeline

(refreshed 47× in last 7d / 69× 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.

  1. 2026-07-07 00:14 UTCEG score recompute
  2. 2026-07-07 00:14 UTCVendor advisory
  3. 2026-07-07 00:14 UTCGHSA enrichment
  4. 2026-07-06 11:30 UTCEG score recompute
  5. 2026-07-06 11:30 UTCVendor advisory
  6. 2026-07-06 11:30 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 22:46 UTCEG score recompute
  10. 2026-07-05 22:46 UTCVendor advisory
  11. 2026-07-05 22:46 UTCGHSA enrichment
  12. 2026-07-05 10:00 UTCEG score recompute
  13. 2026-07-05 10:00 UTCVendor advisory
  14. 2026-07-05 10:00 UTCGHSA enrichment
  15. 2026-07-05 02:31 UTCEPSS rescore
  16. 2026-07-05 02:30 UTCEPSS rescore
  17. 2026-07-04 21:15 UTCEG score recompute
  18. 2026-07-04 21:15 UTCVendor advisory
  19. 2026-07-04 21:15 UTCGHSA enrichment
  20. 2026-07-04 08:31 UTCEG score recompute
  21. 2026-07-04 08:31 UTCVendor advisory
  22. 2026-07-04 08:31 UTCGHSA enrichment
  23. 2026-07-04 06:31 UTCEPSS rescore
  24. 2026-07-04 06:31 UTCEPSS rescore
  25. 2026-07-03 19:44 UTCEG score recompute
Show 44 more
  1. 2026-07-03 19:44 UTCVendor advisory
  2. 2026-07-03 19:44 UTCGHSA enrichment
  3. 2026-07-03 07:00 UTCEG score recompute
  4. 2026-07-03 07:00 UTCVendor advisory
  5. 2026-07-03 07:00 UTCGHSA enrichment
  6. 2026-07-02 18:08 UTCEG score recompute
  7. 2026-07-02 18:08 UTCVendor advisory
  8. 2026-07-02 18:08 UTCGHSA enrichment
  9. 2026-07-02 05:24 UTCEG score recompute
  10. 2026-07-02 05:24 UTCVendor advisory
  11. 2026-07-02 05:24 UTCGHSA enrichment
  12. 2026-07-01 16:39 UTCEG score recompute
  13. 2026-07-01 16:39 UTCVendor advisory
  14. 2026-07-01 16:38 UTCGHSA enrichment
  15. 2026-07-01 15:07 UTCEPSS rescore
  16. 2026-07-01 03:55 UTCEG score recompute
  17. 2026-07-01 03:55 UTCVendor advisory
  18. 2026-07-01 03:55 UTCGHSA enrichment
  19. 2026-06-30 23:22 UTCEPSS rescore
  20. 2026-06-30 15:11 UTCEG score recompute
  21. 2026-06-30 15:11 UTCVendor advisory
  22. 2026-06-30 15:10 UTCGHSA enrichment
  23. 2026-06-30 02:20 UTCEG score recompute
  24. 2026-06-30 02:20 UTCVendor advisory
  25. 2026-06-30 02:20 UTCGHSA enrichment
  26. 2026-06-29 14:06 UTCEPSS rescore
  27. 2026-06-29 14:06 UTCEPSS rescore
  28. 2026-06-29 13:36 UTCEG score recompute
  29. 2026-06-29 13:36 UTCVendor advisory
  30. 2026-06-29 13:36 UTCGHSA enrichment
  31. 2026-06-29 00:52 UTCEG score recompute
  32. 2026-06-29 00:52 UTCVendor advisory
  33. 2026-06-29 00:52 UTCGHSA enrichment
  34. 2026-06-28 14:07 UTCEPSS rescore
  35. 2026-06-28 12:08 UTCEG score recompute▲ 7.80
  36. 2026-06-28 12:08 UTCVendor advisory
  37. 2026-06-28 12:08 UTCGHSA enrichment
  38. 2026-06-28 07:52 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  39. 2026-06-28 04:56 UTCEPSS rescore
  40. 2026-06-28 04:56 UTCEPSS rescore
  41. 2026-06-27 03:08 UTCEPSS rescore
  42. 2026-06-25 13:49 UTCEPSS rescore
  43. 2026-06-25 10:05 UTCEG score recompute
  44. 2026-06-25 10:05 UTCGHSA enrichment

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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 June 30, 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 3.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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.

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