SB20260928184 - Mismatched Memory Management Routines in Linux kernel s390 net driver

Description

This security bulletin contains information about 1 vulnerability.

1) Mismatched Memory Management Routines (CVE-ID: CVE-2026-98024)

CWE-ID: CWE-762 - Mismatched Memory Management Routines

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause slab allocator corruption.

The vulnerability exists due to incorrect memory deallocation in ism_alloc_dmb() when handling an error after allocating dmb->cpu_addr with folio_alloc(). A local user can trigger the error exit to cause slab allocator corruption.

The dmb->cpu_addr pointer may be used by future callers after the associated folio has been released.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/60983356fab0c1171c5cb1b56a36349ebadc608e
• https://git.kernel.org/stable/c/890e2ef726904d1d8328e4b9f5090eeb8761b9d1
• https://git.kernel.org/stable/c/907a56ab3eb8a58500a58daa76087f17bb2b6826
• https://git.kernel.org/stable/c/eebb6a9017b55ac05be770cf7b89f9da49505ae7