FKIE_CVE-2026-72098
Vulnerability from fkie_nvd - Published: 2026-08-15 06:21 - Updated: 2026-10-21 13:19
Severity
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 |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/md/dm-verity-fec.c",
"drivers/md/dm-verity-fec.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "374775626c327aec2425c16b4d36706e5f8718b8",
"status": "affected",
"version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70",
"versionType": "git"
},
{
"lessThan": "dc662eed1c432cc2fd4e9314f58d30b3a8cca7cc",
"status": "affected",
"version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70",
"versionType": "git"
},
{
"lessThan": "5488d3a69d205e28f74f18857b853aa12e778e66",
"status": "affected",
"version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70",
"versionType": "git"
},
{
"lessThan": "f7990c2b0f08b8841fcd2652d1d7002f5994a7a7",
"status": "affected",
"version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70",
"versionType": "git"
},
{
"lessThan": "31d6e6c0ba8d5a7bd59660035a089307100c5e8e",
"status": "affected",
"version": "a739ff3f543afbb4a041c16cd0182c8e8d366e70",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/md/dm-verity-fec.c",
"drivers/md/dm-verity-fec.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.5"
},
{
"lessThan": "4.5",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-verity: fix buffer overflow in FEC calculation\n\nThere\u0027s a buffer overflow in dm-verity-fec:\n\nif (neras \u0026\u0026 *neras \u003c= v-\u003efec-\u003eroots)\n\tfio-\u003eerasures[(*neras)++] = i;\n\nThis allows *neras to reach roots + 1 (the post-increment pushes it past\nroots). This value is then passed as no_eras to decode_rs8(). Inside the\nRS decoder (lib/reed_solomon/decode_rs.c:113-121), the erasure locator\npolynomial loop writes lambda[j] where j can reach nroots + 1 \u2014 one\nelement past the end of lambda[] (which is sized nroots + 1, valid\nindices 0..nroots). The out-of-bounds write lands on syn[0], corrupting\nthe syndrome buffer."
}
],
"id": "CVE-2026-72098",
"lastModified": "2026-10-21T13:19:32.710",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-72098",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:51:49.534768Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-08-15T06:21:23.897",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/31d6e6c0ba8d5a7bd59660035a089307100c5e8e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/374775626c327aec2425c16b4d36706e5f8718b8"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/5488d3a69d205e28f74f18857b853aa12e778e66"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/dc662eed1c432cc2fd4e9314f58d30b3a8cca7cc"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f7990c2b0f08b8841fcd2652d1d7002f5994a7a7"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-787"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
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Nomenclature
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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