dm-verity: fix buffer overflow in FEC calculation
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.
CVE-2026-72098
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-72098
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70",
"lessThan": "374775626c327aec2425c16b4d36706e5f8718b8",
"versionType": "git"
},
{
"status": "affected",
"version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70",
"lessThan": "dc662eed1c432cc2fd4e9314f58d30b3a8cca7cc",
"versionType": "git"
},
{
"status": "affected",
"version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70",
"lessThan": "5488d3a69d205e28f74f18857b853aa12e778e66",
"versionType": "git"
},
{
"status": "affected",
"version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70",
"lessThan": "f7990c2b0f08b8841fcd2652d1d7002f5994a7a7",
"versionType": "git"
},
{
"status": "affected",
"version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70",
"lessThan": "31d6e6c0ba8d5a7bd59660035a089307100c5e8e",
"versionType": "git"
}
],
"programFiles": [
"drivers/md/dm-verity-fec.c",
"drivers/md/dm-verity-fec.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/md/dm-verity-fec.c",
"drivers/md/dm-verity-fec.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-72098
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #46490 · Revision 1
- Added to Heist Feed
- Publisher date