SB20261022420 - Use-after-free in Linux kernel core

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-98804)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause memory corruption that may result in a denial of service.

The vulnerability exists due to a use-after-free in page_pool_recycle_ring_bulk() when updating recycle statistics after releasing the producer lock. A local user can potentially trigger concurrent bulk recycling and page pool destruction to cause a statistics update to access freed pool memory, potentially crashing the kernel.

The vulnerability requires CONFIG_PAGE_POOL_STATS=y and recycling the last inflight netmems of a pool being destroyed.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0b105f4eb78e5ee39e5a74c47c9efd69b6ac849c
• https://git.kernel.org/stable/c/bdea4980182e3badac74f04df6c07492b91c569e
• https://git.kernel.org/stable/c/f78d45d5f1ac4141a03f033141368671da4293e4