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Test your applicationsUpgrade Rocky-Linux:9 kernel to version 0:5.14.0-687.47.1.el9_8 or higher.
This issue was patched in RLSA-2026:67150.
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by Rocky-Linux.
See How to fix? for Rocky-Linux:9 relevant fixed versions and status.
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.