GHSA-383P-4F3R-Q68W
Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32In 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.
{
"affected": [],
"aliases": [
"CVE-2026-89525"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-11T20:19:35Z",
"severity": null
},
"details": "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": "GHSA-383p-4f3r-q68w",
"modified": "2026-09-14T15:32:27Z",
"published": "2026-09-11T21:31:30Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89525"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1bd7947f1463c21edafa256d0fbec5b99215e2b6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8a8c1c42a34349a0626d910abbad5a29136446b7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9193368408d792cec2057628d87862140fb1ce1c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b77b83f5529a26d084d64ece98abd6f0cc86e053"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b95c33a4e743874f1b0a45bf2aaa4da553552bd1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cac0cb07f29ccfb373fd4a36c81e908ef3ce608c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f64e01a90326bb85a3cc8aa0199931dc2f15b589"
}
],
"schema_version": "1.4.0",
"severity": []
}
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