dm-verity: fix buffer overflow in FEC calculation
CVE-2026-72098 · published 15 Aug 2026
How serious is it
- Severity: critical, CVSS score 9.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-72098?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: a739ff3f543afbb4a041c16cd0182c8e8d366e70 to < 374775626c327aec2425c16b4d36706e5f8718b8, a739ff3f543afbb4a041c16cd0182c8e8d366e70 to < dc662eed1c432cc2fd4e9314f58d30b3a8cca7cc, a739ff3f543afbb4a041c16cd0182c8e8d366e70 to < 5488d3a69d205e28f74f18857b853aa12e778e66, a739ff3f543afbb4a041c16cd0182c8e8d366e70 to < f7990c2b0f08b8841fcd2652d1d7002f5994a7a7
- Linux Linux: 4.5
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/374775626c327aec2425c16b4d36706e5f8718b8
- git.kernel.org/stable/c/dc662eed1c432cc2fd4e9314f58d30b3a8cca7cc
- git.kernel.org/stable/c/5488d3a69d205e28f74f18857b853aa12e778e66
- git.kernel.org/stable/c/f7990c2b0f08b8841fcd2652d1d7002f5994a7a7
- git.kernel.org/stable/c/31d6e6c0ba8d5a7bd59660035a089307100c5e8e
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON