CVE-2026-72098
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.
CSIRTS triage
- What
- Buffer overflow in dm-verity FEC calculation enables memory corruption.
- Who is affected
- Systems using dm-verity with forward error correction enabled.
- Urgency
- Moderate priority; buffer overflow can cause denial of service or code execution if exploited.
- Action
- Apply kernel patch addressing the buffer overflow in dm-verity FEC calculation.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2026-72098
Get an email if CVE-2026-72098 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Low exploitation risk0.65% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 48% of all EPSS-scored CVEs.
Advisory coverage (2)
- criticalCVE-2026-72098: In the Linux kernel, the following vulnerability has been resolved: dm-verity: fix buffer over…nvd · 2026-08-15
- mediumCVE-2026-72098: dm-verity: fix buffer overflow in FEC calculationmsrc · 2026-08-11
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-72098)