CVE-2026-46104: selinux: use sk blob accessor in socket permission helpers

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-28 · updated 2026-06-25

Description

In the Linux kernel, the following vulnerability has been resolved: selinux: use sk blob accessor in socket permission helpers SELinux socket state lives in the composite LSM socket blob. sock_has_perm() and nlmsg_sock_has_extended_perms() currently dereference sk->sk_security directly, which assumes the SELinux socket blob is at offset zero. In stacked configurations that assumption does not hold. If another LSM allocates socket blob storage before SELinux, these helpers may read the wrong blob and feed invalid SID and class values into AVC checks. Use selinux_sock() instead of accessing sk->sk_security directly.

Affected products

Linux kernel: from 6.13 before 6.18.30; from 6.19 before 7.0.7; 7.1-rc1 — fixed in 6.18.30, 7.0.7

How to fix

Upgrade to a fixed version: Linux kernel 6.18.30, 7.0.7. Check the vendor advisory for mitigations.

References

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