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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
4447bb33f09444920a8f1d89e1540137429351b6 affected < 958ae9f261319e1cdc44879886bcda2263258cca
4447bb33f09444920a8f1d89e1540137429351b6 affected < fb7f3e74789a3c89647f4eb768f6dfaf4a751e72
4447bb33f09444920a8f1d89e1540137429351b6 affected < ba0c110c205855b3f1e3130d8c0fdb484d704c8c
4447bb33f09444920a8f1d89e1540137429351b6 affected < c8837bbe792257af547fd1c0252553ce13148795
4447bb33f09444920a8f1d89e1540137429351b6 affected < 71d42da01740ec6557837bebec0bc48cfc3b4c39
4447bb33f09444920a8f1d89e1540137429351b6 affected < cf67361e78dca488d6e4df8396a53e6745a3a80e
4447bb33f09444920a8f1d89e1540137429351b6 affected < 37426395cb90ef217beec8407a14bd82153793d3
4447bb33f09444920a8f1d89e1540137429351b6 affected < be19d20e53a239572bb2a28efcc1cd2b069b1ef9
4447bb33f09444920a8f1d89e1540137429351b6 affected < c12cbf56320fb633484ee0ca1fb7d68d6b64b213
Linux Linux affected
Version Status Constraints
2.6.33 affected —
0 unaffected < 2.6.33
5.10.269 unaffected ≤ 5.10.*
5.15.220 unaffected ≤ 5.15.*
6.1.187 unaffected ≤ 6.1.*
6.6.156 unaffected ≤ 6.6.*
6.12.108 unaffected ≤ 6.12.*
6.18.49 unaffected ≤ 6.18.*
7.1.13 unaffected ≤ 7.1.*
7.2.3 unaffected ≤ 7.2.*
7.3-rc1 unaffected ≤ *

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

No data.

Project Subscriptions

Vendors Products
Linux Subscribe
Linux Kernel Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/37426395cb90ef217beec8407a14bd82153793d3 cve-icon cve-icon
https://git.kernel.org/stable/c/71d42da01740ec6557837bebec0bc48cfc3b4c39 cve-icon cve-icon
https://git.kernel.org/stable/c/958ae9f261319e1cdc44879886bcda2263258cca cve-icon cve-icon
https://git.kernel.org/stable/c/ba0c110c205855b3f1e3130d8c0fdb484d704c8c cve-icon cve-icon
https://git.kernel.org/stable/c/be19d20e53a239572bb2a28efcc1cd2b069b1ef9 cve-icon cve-icon
https://git.kernel.org/stable/c/c12cbf56320fb633484ee0ca1fb7d68d6b64b213 cve-icon cve-icon
https://git.kernel.org/stable/c/c8837bbe792257af547fd1c0252553ce13148795 cve-icon cve-icon
https://git.kernel.org/stable/c/cf67361e78dca488d6e4df8396a53e6745a3a80e cve-icon cve-icon
https://git.kernel.org/stable/c/fb7f3e74789a3c89647f4eb768f6dfaf4a751e72 cve-icon cve-icon
History

Fri, 04 Sep 2026 19:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-362

Fri, 04 Sep 2026 16:00:00 +0000

Type Values Removed Values Added
Description 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.
Title xfrm: fix xfrm_state_construct() auth-trunc leak
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-09-04T15:54:53.328Z

Reserved: 2026-08-26T14:34:25.796Z

Link: CVE-2026-80843

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-04T16:18:12.877

Modified: 2026-09-04T16:18:12.877

Link: CVE-2026-80843

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-04T18:45:03Z

Weaknesses