VulnerabilityPublished 6 May 2026Updated 21 Oct 2026

CVE-2026-43107: Linux kernel · xfrm: account XFRMA_IF_ID in aevent size calculation

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f8f3bb89ab677db15f9f5250c77af728f9afe995 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f8f3bb89ab677db15f9f5250c77af728f9afe995, e62e322ea20be78e346e4b49f9a6b9f03313af4c, 7081d46d32312f1a31f0e0e99c6835a394037599 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 6 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7e6526404adedf079279aa7aa11722deaca8fe2e, < f8f3bb89ab677db15f9f5250c77af728f9afe995	Fixed in f8f3bb89ab677db15f9f5250c77af728f9afe995
LinuxLinux	Affected ≥ 7e6526404adedf079279aa7aa11722deaca8fe2e, < e62e322ea20be78e346e4b49f9a6b9f03313af4c	Fixed in e62e322ea20be78e346e4b49f9a6b9f03313af4c
LinuxLinux	Affected ≥ 7e6526404adedf079279aa7aa11722deaca8fe2e, < 7081d46d32312f1a31f0e0e99c6835a394037599	Fixed in 7081d46d32312f1a31f0e0e99c6835a394037599
LinuxLinux	Affected ≥ 7e6526404adedf079279aa7aa11722deaca8fe2e, < 58e5735d1a5373652f405a0c16e54ac04aaab0ad	Fixed in 58e5735d1a5373652f405a0c16e54ac04aaab0ad
LinuxLinux	Affected ≥ 7e6526404adedf079279aa7aa11722deaca8fe2e, < 2c41283d94af943a05f7f2cc1a01f0c872f3cf43	Fixed in 2c41283d94af943a05f7f2cc1a01f0c872f3cf43
LinuxLinux	Affected =4.19	Fixed in–

Description

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.

References

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