CVE-2026-43090

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-05-06. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 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: fix refcount leak in xfrm_migrate_policy_find

syzkaller reported a memory leak in xfrm_policy_alloc:

BUG: memory leak unreferenced object 0xffff888114d79000 (size 1024): comm "syz.1.17", pid 931 ... xfrm_policy_alloc+0xb3/0x4b0 net/xfrm/xfrm_policy.c:432

The root cause is a double call to xfrm_pol_hold_rcu() in xfrm_migrate_policy_find(). The lookup function already returns a policy with held reference, making the second call redundant.

Remove the redundant xfrm_pol_hold_rcu() call to fix the refcount imbalance and prevent the memory leak.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

May 6, 2026

Last Modified

May 19, 2026

Advisory Details (4)

Auto-updated Jun 14, 2026
No patch confirmed yet.
generic

xfrm: fix refcount leak in xfrm_migrate_policy_find - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/836ee1b0426ea3db31531e9581cc32f513d24e32
generic

xfrm: fix refcount leak in xfrm_migrate_policy_find - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/83317cce60a032c49480dcdabe146435bd689d03
generic

xfrm: fix refcount leak in xfrm_migrate_policy_find - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/70c2a89a3bc207c3bfbf6f21bb439809e0a4a27a
generic

xfrm: fix refcount leak in xfrm_migrate_policy_find - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/21e235a36cfb6d145cefb10728f12f5dc5412f54

Vendor Advisories for CVE-2026-43090(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.12.83—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

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (126 versions)6.19.14-1—

Data Freshness Timeline

(refreshed 5× in last 7d / 46× 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 160 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-43090?
CVE-2026-43090 is a medium vulnerability published on May 6, 2026. In the Linux kernel, the following vulnerability has been resolved: xfrm: fix refcount leak in xfrmmigratepolicy_find syzkaller reported a memory leak in xfrmpolicyalloc: BUG: memory leak unreferenced object 0xffff888114d79000 (size 1024): comm "syz.1.17", pid 931 ... xfrmpolicyalloc+0xb3/0x4b0…
When was CVE-2026-43090 disclosed?
CVE-2026-43090 was first published in the National Vulnerability Database on May 6, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43090 actively exploited?
CVE-2026-43090 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 97.8% of all scored CVEs.
What is the CVSS score of CVE-2026-43090?
CVE-2026-43090 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-43090?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43090, 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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