CVE-2026-80843xfrm: fix xfrm_state_construct() auth-trunc leak
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: xfrm: fix xfrm_state_construct() auth-trunc leak attach_auth_trunc() can allocate x->aalg while leaving x->props.aalgo at zero when the selected auth algorithm has no sadb_alg_id. One real case is cmac(aes). xfrm_state_construct() then treats !x->props.aalgo as "no auth algorithm attached yet" and calls attach_auth(). That overwrites x->aalg and loses the first allocation. Any later failure or teardown only frees the replacement pointer. Check whether x->aalg is already attached instead of inferring that state from x->props.aalgo.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 4, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 4447bb33f09444920a8f1d89e1540137429351b6 builds before 958ae9f261319e1cdc44879886bcda2263258cca; from 4447bb33f09444920a8f1d89e1540137429351b6 before fb7f3e74789a3c89647f4eb768f6dfaf4a751e72; from 4447bb33f09444920a8f1d89e1540137429351b6 before ba0c110c205855b3f1e3130d8c0fdb484d704c8c; from 4447bb33f09444920a8f1d89e1540137429351b6 before c8837bbe792257af547fd1c0252553ce13148795; 4447bb33f09444920a8f1d89e1540137429351b6 builds before 71d42da01740ec6557837bebec0bc48cfc3b4c39; from 4447bb33f09444920a8f1d89e1540137429351b6 before cf67361e78dca488d6e4df8396a53e6745a3a80e; from 4447bb33f09444920a8f1d89e1540137429351b6 before 37426395cb90ef217beec8407a14bd82153793d3; from 4447bb33f09444920a8f1d89e1540137429351b6 before be19d20e53a239572bb2a28efcc1cd2b069b1ef9; and 1 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/958ae9f261319e1cdc44879886bcda2263258cca
- https://git.kernel.org/stable/c/fb7f3e74789a3c89647f4eb768f6dfaf4a751e72
- https://git.kernel.org/stable/c/ba0c110c205855b3f1e3130d8c0fdb484d704c8c
- https://git.kernel.org/stable/c/c8837bbe792257af547fd1c0252553ce13148795
- https://git.kernel.org/stable/c/71d42da01740ec6557837bebec0bc48cfc3b4c39
- https://git.kernel.org/stable/c/cf67361e78dca488d6e4df8396a53e6745a3a80e
- https://git.kernel.org/stable/c/37426395cb90ef217beec8407a14bd82153793d3
- https://git.kernel.org/stable/c/be19d20e53a239572bb2a28efcc1cd2b069b1ef9
- https://git.kernel.org/stable/c/c12cbf56320fb633484ee0ca1fb7d68d6b64b213
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.