SB20260912259 - Heap-based buffer overflow in Linux kernel sunrpc xprtrdma

Description

This security bulletin contains information about 1 vulnerability.

1) Heap-based buffer overflow (CVE-ID: CVE-2026-89530)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to corrupt adjacent slab memory.

The vulnerability exists due to a heap-based buffer overflow in svc_rdma_xb_linearize() when processing oversized inline RPC-over-RDMA replies without a Write list or Reply chunk. A remote attacker can request an oversized inline reply without providing a Write list or Reply chunk to corrupt adjacent slab memory.

The posted scatter/gather entry length can cause the device to read beyond the mapped region.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0fbe20dfe74b783d255bf389a6ea77aa25dc7860
• https://git.kernel.org/stable/c/1949dd1576f7a8aa161b1330c6125df9d53046d5
• https://git.kernel.org/stable/c/8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf
• https://git.kernel.org/stable/c/fcd91b9957462d398792201c239dffaeff1cc8b2