SB20260816439 - Out-of-bounds write in Linux kernel md driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-72098)

CWE-ID: CWE-787 - Out-of-bounds write

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 memory corruption.

The vulnerability exists due to an out-of-bounds write in dm-verity fec calculation when processing erasure data during FEC decoding. A local user can trigger crafted corruption conditions to cause memory corruption.

The out-of-bounds write can occur when the erasure count exceeds the intended Reed-Solomon roots limit and the decoder writes past the end of the lambda array into the syndrome buffer.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/31d6e6c0ba8d5a7bd59660035a089307100c5e8e
• https://git.kernel.org/stable/c/5488d3a69d205e28f74f18857b853aa12e778e66
• https://git.kernel.org/stable/c/f7990c2b0f08b8841fcd2652d1d7002f5994a7a7