CVE-2026-80843
xfrm: fix xfrm_state_construct() auth-trunc leak
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 4, 2026 |
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Affected Versions
Linux / Linux
4447bb33f09444920a8f1d89e1540137429351b6 < 958ae9f261319e1cdc44879886bcda2263258cca 4447bb33f09444920a8f1d89e1540137429351b6 < fb7f3e74789a3c89647f4eb768f6dfaf4a751e72 4447bb33f09444920a8f1d89e1540137429351b6 < ba0c110c205855b3f1e3130d8c0fdb484d704c8c 4447bb33f09444920a8f1d89e1540137429351b6 < c8837bbe792257af547fd1c0252553ce13148795 4447bb33f09444920a8f1d89e1540137429351b6 < 71d42da01740ec6557837bebec0bc48cfc3b4c39 4447bb33f09444920a8f1d89e1540137429351b6 < cf67361e78dca488d6e4df8396a53e6745a3a80e 4447bb33f09444920a8f1d89e1540137429351b6 < 37426395cb90ef217beec8407a14bd82153793d3 4447bb33f09444920a8f1d89e1540137429351b6 < be19d20e53a239572bb2a28efcc1cd2b069b1ef9 4447bb33f09444920a8f1d89e1540137429351b6 < c12cbf56320fb633484ee0ca1fb7d68d6b64b213
Linux / Linux
2.6.33
References
git.kernel.org: https://git.kernel.org/stable/c/958ae9f261319e1cdc44879886bcda2263258cca git.kernel.org: https://git.kernel.org/stable/c/fb7f3e74789a3c89647f4eb768f6dfaf4a751e72 git.kernel.org: https://git.kernel.org/stable/c/ba0c110c205855b3f1e3130d8c0fdb484d704c8c git.kernel.org: https://git.kernel.org/stable/c/c8837bbe792257af547fd1c0252553ce13148795 git.kernel.org: https://git.kernel.org/stable/c/71d42da01740ec6557837bebec0bc48cfc3b4c39 git.kernel.org: https://git.kernel.org/stable/c/cf67361e78dca488d6e4df8396a53e6745a3a80e git.kernel.org: https://git.kernel.org/stable/c/37426395cb90ef217beec8407a14bd82153793d3 git.kernel.org: https://git.kernel.org/stable/c/be19d20e53a239572bb2a28efcc1cd2b069b1ef9 git.kernel.org: https://git.kernel.org/stable/c/c12cbf56320fb633484ee0ca1fb7d68d6b64b213