CVE-2026-89525 (GCVE-0-2026-89525)
Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-10-19 08:48
VLAI
EPSS
VEX
Title
udf: reject VAT indexes equal to the entry count
Summary
In the Linux kernel, the following vulnerability has been resolved:
udf: reject VAT indexes equal to the entry count
UDF 1.50 virtual partition mapping uses the VAT as an array of physical
block mappings. s_num_entries stores the number of entries in that array,
not the highest valid index. The valid VAT indexes are therefore below
s_num_entries.
udf_get_pblock_virt15() currently rejects only indexes greater than
s_num_entries. A crafted image can request index s_num_entries, pass the
bounds check, and make the kernel read one entry past the allocated VAT table.
Change the check to reject block >= s_num_entries, so the count is handled as
an exclusive upper bound.
A crafted UDF image reproduced this on origin/master commit
0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53 with a KASAN slab-out-of-bounds
report in udf_get_pblock_virt15().
Trail of Bits has a reproducer that triggers kernel panic demonstrating the bug, and can share it if needed.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f64e01a90326bb85a3cc8aa0199931dc2f15b589
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8a8c1c42a34349a0626d910abbad5a29136446b7 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b77b83f5529a26d084d64ece98abd6f0cc86e053 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9193368408d792cec2057628d87862140fb1ce1c (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b95c33a4e743874f1b0a45bf2aaa4da553552bd1 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1bd7947f1463c21edafa256d0fbec5b99215e2b6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cac0cb07f29ccfb373fd4a36c81e908ef3ce608c (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
{
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},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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{
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"versionEndExcluding": "5.10.270",
"versionStartIncluding": "2.6.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.221",
"versionStartIncluding": "2.6.12",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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}
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudf: reject VAT indexes equal to the entry count\n\nUDF 1.50 virtual partition mapping uses the VAT as an array of physical\nblock mappings. s_num_entries stores the number of entries in that array,\nnot the highest valid index. The valid VAT indexes are therefore below\ns_num_entries.\n\nudf_get_pblock_virt15() currently rejects only indexes greater than\ns_num_entries. A crafted image can request index s_num_entries, pass the\nbounds check, and make the kernel read one entry past the allocated VAT table.\n\nChange the check to reject block \u003e= s_num_entries, so the count is handled as\nan exclusive upper bound.\n\nA crafted UDF image reproduced this on origin/master commit\n0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53 with a KASAN slab-out-of-bounds\nreport in udf_get_pblock_virt15().\n\nTrail of Bits has a reproducer that triggers kernel panic demonstrating the bug, and can share it if needed."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-19T08:48:16.507Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/f64e01a90326bb85a3cc8aa0199931dc2f15b589"
},
{
"url": "https://git.kernel.org/stable/c/8a8c1c42a34349a0626d910abbad5a29136446b7"
},
{
"url": "https://git.kernel.org/stable/c/19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4"
},
{
"url": "https://git.kernel.org/stable/c/b77b83f5529a26d084d64ece98abd6f0cc86e053"
},
{
"url": "https://git.kernel.org/stable/c/9193368408d792cec2057628d87862140fb1ce1c"
},
{
"url": "https://git.kernel.org/stable/c/b95c33a4e743874f1b0a45bf2aaa4da553552bd1"
},
{
"url": "https://git.kernel.org/stable/c/1bd7947f1463c21edafa256d0fbec5b99215e2b6"
},
{
"url": "https://git.kernel.org/stable/c/cac0cb07f29ccfb373fd4a36c81e908ef3ce608c"
}
],
"title": "udf: reject VAT indexes equal to the entry count",
"x_generator": {
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}
}
},
"cveMetadata": {
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"cveId": "CVE-2026-89525",
"datePublished": "2026-09-11T19:44:06.296Z",
"dateReserved": "2026-09-11T19:38:34.719Z",
"dateUpdated": "2026-10-19T08:48:16.507Z",
"state": "PUBLISHED"
},
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"date": "2026-11-15",
"epss": "0.00184",
"percentile": "0.08109"
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{
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{
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},
{
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudf: reject VAT indexes equal to the entry count\n\nUDF 1.50 virtual partition mapping uses the VAT as an array of physical\nblock mappings. s_num_entries stores the number of entries in that array,\nnot the highest valid index. The valid VAT indexes are therefore below\ns_num_entries.\n\nudf_get_pblock_virt15() currently rejects only indexes greater than\ns_num_entries. A crafted image can request index s_num_entries, pass the\nbounds check, and make the kernel read one entry past the allocated VAT table.\n\nChange the check to reject block \u003e= s_num_entries, so the count is handled as\nan exclusive upper bound.\n\nA crafted UDF image reproduced this on origin/master commit\n0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53 with a KASAN slab-out-of-bounds\nreport in udf_get_pblock_virt15().\n\nTrail of Bits has a reproducer that triggers kernel panic demonstrating the bug, and can share it if needed."
}
],
"id": "CVE-2026-89525",
"lastModified": "2026-10-19T09:17:47.013",
"metrics": {},
"published": "2026-09-11T20:19:35.263",
"references": [
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"url": "https://git.kernel.org/stable/c/9193368408d792cec2057628d87862140fb1ce1c"
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-06T01:17:06+00:00",
"cve": "CVE-2026-89525",
"id": "CVE-2026-89525",
"initial_release_date": "2026-09-11T00:00:00+00:00",
"product_status:known_affected": "203",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: udf: reject VAT indexes equal to the entry count",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89525.json",
"version": "3"
}
}
}
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