SB20261022410 - Out-of-bounds read in Linux kernel sched

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-98797)

CWE-ID: CWE-125 - Out-of-bounds read

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 by triggering an out-of-bounds kernel memory access that may crash the system.

The vulnerability exists due to an out-of-bounds read in the Linux kernel's transmit queue handling and taprio_enqueue() when nested packet transmissions leak the skip_txqueue flag into an outer transmission, causing a stale queue mapping to index beyond taprio's child array. A local user can configure skbedit and mirred actions with CAP_NET_ADMIN in a network namespace and redirect traffic between devices with different queue counts to trigger an invalid queue pointer dereference and potentially cause a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2f581814e4e3ea6a5e98f49813dc4c68444a0c4a
• https://git.kernel.org/stable/c/c6ec35c8267c84c2094cb485db20c06384fc2bcc
• https://git.kernel.org/stable/c/ea4d4b5dddb5121e64f56fd8e0720bd8b447b63d
• https://git.kernel.org/stable/c/f99de42f5c6f8d088063817dad82c3334e87c570