SB2026040688 - Use-after-free in Linux kernel intel igc driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-23445)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to a use-after-free in the igc driver XDP TX timestamp handling when shutting down an XDP application with TX timestamping while the interface link remains up. A local user can trigger TX ring shutdown and concurrent IRQ handling to cause a denial of service.

The issue occurs because stale xsk_meta pointers remain after TX ring shutdown and are later accessed by the interrupt handler, leading to a kernel page fault. TX timestamps on other queues remain unaffected.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/31521c124e6488c4a81658e35199feb75a988d86
• https://git.kernel.org/stable/c/45b33e805bd39f615d9353a7194b2da5281332df
• https://git.kernel.org/stable/c/5e4c90c94eb766d70e30694b7fe66862aabaf24b
• https://git.kernel.org/stable/c/b02fa17d1744d19cd3820bdbf6ec5d85547977bf