SB2026091212 - Out-of-bounds write in Linux kernel apparmor include

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-89761)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause memory corruption.

The vulnerability exists due to an out-of-bounds write in the AppArmor label vector setup used by aa_label_strn_parse() when parsing label names containing multiple "//&"-separated components. A local user can supply a crafted label name to cause memory corruption.

Every label component must resolve to a loaded profile.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/28069434aef66b9d084f0609b7a29c171846815e
• https://git.kernel.org/stable/c/36bdd0b45ec3f4822832a56e9db8674c8450dfce
• https://git.kernel.org/stable/c/9124e078ea2250d8d01d2162a550acb01ef5bf48
• https://git.kernel.org/stable/c/9f1e40193eef7f047e6b77cfb4b4cafdecd7a123