CVE-2026-72098

Summary

In the Linux kernel, the following vulnerability has been resolved:

dm-verity: fix buffer overflow in FEC calculation

There's a buffer overflow in dm-verity-fec:

if (neras && *neras <= v->fec->roots) fio->erasures[(*neras)++] = i;

This allows *neras to reach roots + 1 (the post-increment pushes it past roots). This value is then passed as no_eras to decode_rs8(). Inside the RS decoder (lib/reed_solomon/decode_rs.c:113-121), the erasure locator polynomial loop writes lambda[j] where j can reach nroots + 1 — one element past the end of lambda[] (which is sized nroots + 1, valid indices 0..nroots). The out-of-bounds write lands on syn[0], corrupting the syndrome buffer.

Affected Software

Weaknesses

References

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

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