SB20260816447 - Use-after-free in Linux kernel resctrl

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-72080)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in event file handling for the default resctrl resource group when reading a monitoring event file during unmount or teardown. A local user can read a monitoring event file concurrently with unmount to cause a denial of service.

The issue occurs because the default resource group is not marked deleted, allowing a waiting reader to resume after kernfs node teardown and dereference already-freed file private data.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/52fce648607e0d6a76eeb443d78708c49df1c554
• https://git.kernel.org/stable/c/7b7bb07efe41bb646a93c4624aa2bb35df190342
• https://git.kernel.org/stable/c/7d330a1d663381579b9d5dafa642b1b3158a0ce2