CVE-2026-80843 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20506507
- published5 Oct 2026
- disclosed4 Sept 2026
Introduced: 4 Sep 2026
CVE-2026-80843 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-80843
- https://git.kernel.org/stable/c/37426395cb90ef217beec8407a14bd82153793d3
- https://git.kernel.org/stable/c/71d42da01740ec6557837bebec0bc48cfc3b4c39
- https://git.kernel.org/stable/c/958ae9f261319e1cdc44879886bcda2263258cca
- https://git.kernel.org/stable/c/ba0c110c205855b3f1e3130d8c0fdb484d704c8c
- https://git.kernel.org/stable/c/be19d20e53a239572bb2a28efcc1cd2b069b1ef9
- https://git.kernel.org/stable/c/c12cbf56320fb633484ee0ca1fb7d68d6b64b213
- https://git.kernel.org/stable/c/c8837bbe792257af547fd1c0252553ce13148795
- https://git.kernel.org/stable/c/cf67361e78dca488d6e4df8396a53e6745a3a80e
- https://git.kernel.org/stable/c/fb7f3e74789a3c89647f4eb768f6dfaf4a751e72