CVE-2026-46104

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxd1d991efaf34606d500dcbd28bedc0666eeec8e2 < d350fef4bc2467fe1bce15f7a20fe60e01ce41adaffected
LinuxLinuxd1d991efaf34606d500dcbd28bedc0666eeec8e2 < 7eca71f57f194c1638ebb7f4097d6be8fd04c101affected
LinuxLinuxd1d991efaf34606d500dcbd28bedc0666eeec8e2 < 032e70aff025d7c519af9ab791cd084380619263affected
LinuxLinux6.13affected
LinuxLinux0 < 6.13unaffected
LinuxLinux6.18.30 <= 6.18.*unaffected
LinuxLinux7.0.7 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References