SB2026050595 - SUSE update for the Linux Kernel RT (Live Patch 7 for SUSE Linux Enterprise 15 SP7)

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

1) Use-after-free (CVE-ID: CVE-2025-39977)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the function in kernel/futex/requeue.c. A local user can escalate privileges on the system.

2) Use-after-free (CVE-ID: CVE-2025-71066)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the ets_qdisc_change() function in net/sched/sch_ets.c. A local user can escalate privileges on the system.

3) Use-after-free (CVE-ID: CVE-2026-23004)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the rt6_uncached_list_add() function in net/ipv6/route.c. A local user can escalate privileges on the system.

4) Out-of-bounds read (CVE-ID: CVE-2026-23204)

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to an out-of-bounds read error within the u32_classify() function in net/sched/cls_u32.c. A local user can perform a denial of service (DoS) attack.

5) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-31431)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to improper memory handling within the authencesn cryptographic template in algif_aead when processing AEAD operations. A local user can trigger the vulnerable code path to execute arbitrary code on the system.

Note, this vulnerability was dubbed "Copy Fail". 

Remediation

Install update from vendor's website.

References

• https://www.suse.com/support/update/announcement/2026/suse-su-20261686-1/