xfrm: account XFRMA_IF_ID in aevent size calculation

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Summary

CVECVE-2026-43107
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 10:16:24 UTC
Updated2026-05-11 17:30:05 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-131

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7e6526404adedf079279aa7aa11722deaca8fe2e 2c41283d94af943a05f7f2cc1a01f0c872f3cf43 git Not specified
CNA Linux Linux affected 7e6526404adedf079279aa7aa11722deaca8fe2e e62e322ea20be78e346e4b49f9a6b9f03313af4c git Not specified
CNA Linux Linux affected 7e6526404adedf079279aa7aa11722deaca8fe2e 58e5735d1a5373652f405a0c16e54ac04aaab0ad git Not specified
CNA Linux Linux affected 7e6526404adedf079279aa7aa11722deaca8fe2e 7081d46d32312f1a31f0e0e99c6835a394037599 git Not specified
CNA Linux Linux affected 4.19 Not specified
CNA Linux Linux unaffected 4.19 semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e62e322ea20be78e346e4b49f9a6b9f03313af4c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/58e5735d1a5373652f405a0c16e54ac04aaab0ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7081d46d32312f1a31f0e0e99c6835a394037599 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2c41283d94af943a05f7f2cc1a01f0c872f3cf43 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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