CVE-2026-43107 (GCVE-0-2026-43107)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-10-30 12:24
VLAI
Title
xfrm: account XFRMA_IF_ID in aevent size calculation
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: account XFRMA_IF_ID in aevent size calculation xfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then build_aevent() appends attributes including XFRMA_IF_ID when x->if_id is set. xfrm_aevent_msgsize() does not include space for XFRMA_IF_ID. For states with if_id, build_aevent() can fail with -EMSGSIZE and hit BUG_ON(err < 0) in xfrm_get_ae(), turning a malformed netlink interaction into a kernel panic. Account XFRMA_IF_ID in the size calculation unconditionally and replace the BUG_ON with normal error unwinding.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7e6526404adedf079279aa7aa11722deaca8fe2e , < b7dbdc34d22f743abb2c460dfae0d69cd8a45e69 (git)
Affected: 7e6526404adedf079279aa7aa11722deaca8fe2e , < f8f3bb89ab677db15f9f5250c77af728f9afe995 (git)
Affected: 7e6526404adedf079279aa7aa11722deaca8fe2e , < 2c41283d94af943a05f7f2cc1a01f0c872f3cf43 (git)
Affected: 7e6526404adedf079279aa7aa11722deaca8fe2e , < e62e322ea20be78e346e4b49f9a6b9f03313af4c (git)
Affected: 7e6526404adedf079279aa7aa11722deaca8fe2e , < 58e5735d1a5373652f405a0c16e54ac04aaab0ad (git)
Affected: 7e6526404adedf079279aa7aa11722deaca8fe2e , < 7081d46d32312f1a31f0e0e99c6835a394037599 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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      "title": "kernel: xfrm: account XFRMA_IF_ID in aevent size calculation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43107.json",
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}



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