CVE-2026-43139

HIGHNVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-05-06. NVD baseline CVSS 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.6Exploit: 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:

xfrm6: fix uninitialized saddr in xfrm6_get_saddr()

xfrm6_get_saddr() does not check the return value of ipv6_dev_get_saddr(). When ipv6_dev_get_saddr() fails to find a suitable source address (returns -EADDRNOTAVAIL), saddr->in6 is left uninitialized, but xfrm6_get_saddr() still returns 0 (success).

This causes the caller xfrm_tmpl_resolve_one() to use the uninitialized address in xfrm_state_find(), triggering KMSAN warning:

===================================================== BUG: KMSAN: uninit-value in xfrm_state_find+0x2424/0xa940 xfrm_state_find+0x2424/0xa940 xfrm_resolve_and_create_bundle+0x906/0x5a20 xfrm_lookup_with_ifid+0xcc0/0x3770 xfrm_lookup_route+0x63/0x2b0 ip_route_output_flow+0x1ce/0x270 udp_sendmsg+0x2ce1/0x3400 inet_sendmsg+0x1ef/0x2a0 __sock_sendmsg+0x278/0x3d0 __sys_sendto+0x593/0x720 __x64_sys_sendto+0x130/0x200 x64_sys_call+0x332b/0x3e70 do_syscall_64+0xd3/0xf80 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable tmp.i.i created at: xfrm_resolve_and_create_bundle+0x3e3/0x5a20 xfrm_lookup_with_ifid+0xcc0/0x3770 =====================================================

Fix by checking the return value of ipv6_dev_get_saddr() and propagating the error.

CVSS v3
8.6
EG Score
8.6(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity86% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
30.0%
KEV
Not listed

Published

May 6, 2026

Last Modified

May 13, 2026

Advisory Details (8)

Auto-updated May 13, 2026
No patch confirmed yet.
generic

xfrm6: fix uninitialized saddr in xfrm6_get_saddr() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/eb2ee15290af14c60b45cf2b73f5687d1d077d9b
generic

xfrm6: fix uninitialized saddr in xfrm6_get_saddr() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dc0abce055134cb83b0d981d31ceb20dda419787
generic

xfrm6: fix uninitialized saddr in xfrm6_get_saddr() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c7221e7bd8fc2ef38a0b27be580d9d202281306b
generic

xfrm6: fix uninitialized saddr in xfrm6_get_saddr() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/719918fc88df6da023dfff370cd965151a5afd7f
generic

xfrm6: fix uninitialized saddr in xfrm6_get_saddr() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6535867673bf301d52aa00593a4d1d18cc3922fa
generic

xfrm6: fix uninitialized saddr in xfrm6_get_saddr() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4f28141786e1fe884ce42a5197ba9beed540f0ea
generic

xfrm6: fix uninitialized saddr in xfrm6_get_saddr() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3dcd1664ac15eee6a690daec7c4ffc59190406f7
generic

xfrm6: fix uninitialized saddr in xfrm6_get_saddr() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1799d8abeabc68ec05679292aaf6cba93b343c05

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 5.10.252—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.

Data Freshness Timeline

(refreshed 10× in last 7d / 31× 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 105 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-43139?
CVE-2026-43139 is a high vulnerability published on May 6, 2026. In the Linux kernel, the following vulnerability has been resolved: xfrm6: fix uninitialized saddr in xfrm6getsaddr() xfrm6getsaddr() does not check the return value of ipv6devgetsaddr(). When ipv6devgetsaddr() fails to find a suitable source address (returns -EADDRNOTAVAIL), saddr->in6 is left…
When was CVE-2026-43139 disclosed?
CVE-2026-43139 was first published in the National Vulnerability Database on May 6, 2026, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43139 actively exploited?
CVE-2026-43139 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 30.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43139?
CVE-2026-43139 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-43139?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43139, 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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