SB2026100798 - Use of uninitialized resource in Linux kernel core

Description

This security bulletin contains information about 1 vulnerability.

1) Use of uninitialized resource (CVE-ID: CVE-2026-98271)

CWE-ID: CWE-908 - Use of Uninitialized Resource

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 a denial of service.

The vulnerability exists due to stale header offsets referencing uninitialized packet-buffer data in pskb_carve_inside_header() and pskb_carve_inside_nonlinear() when removing initial packet bytes and reallocating the skb head. A local user can trigger RDS-over-TCP packet processing that leaves these stale offsets to cause a denial of service.

The observed kernel BUG occurs when drop_monitor processes packet buffers freed with SKB_DROP_REASON_QUEUE_PURGE during RDS incoming-message cleanup.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/12929ed66a5166177ef5f06d3da81e4f99993e90
• https://git.kernel.org/stable/c/75e4a3e62531738c124c8555a626426fca29d392
• https://git.kernel.org/stable/c/a5117e1eccac6ee3bd4aed7cacf8ebcb6b3eb309
• https://git.kernel.org/stable/c/bff8a8e53a6d290bc2777bde36d3cb6317b8463d