CVE-2026-72098 (GCVE-0-2026-72098)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-10-30 12:28
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: a739ff3f543afbb4a041c16cd0182c8e8d366e70
Version: a739ff3f543afbb4a041c16cd0182c8e8d366e70
Version: a739ff3f543afbb4a041c16cd0182c8e8d366e70
Version: a739ff3f543afbb4a041c16cd0182c8e8d366e70
Version: a739ff3f543afbb4a041c16cd0182c8e8d366e70
Version: a739ff3f543afbb4a041c16cd0182c8e8d366e70
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