CVE-2026-89525

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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4
https://git.kernel.org/stable/c/1bd7947f1463c21edafa256d0fbec5b99215e2b6
https://git.kernel.org/stable/c/8a8c1c42a34349a0626d910abbad5a29136446b7
https://git.kernel.org/stable/c/9193368408d792cec2057628d87862140fb1ce1c
https://git.kernel.org/stable/c/b77b83f5529a26d084d64ece98abd6f0cc86e053
https://git.kernel.org/stable/c/b95c33a4e743874f1b0a45bf2aaa4da553552bd1
https://git.kernel.org/stable/c/cac0cb07f29ccfb373fd4a36c81e908ef3ce608c
https://git.kernel.org/stable/c/f64e01a90326bb85a3cc8aa0199931dc2f15b589

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-11 20:19

Updated : 2026-09-14 13:19

NVD link : CVE-2026-89525

Mitre link : CVE-2026-89525

CVE.ORG link : CVE-2026-89525

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-89525", "cveTags": [], "metrics": {}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "f64e01a90326bb85a3cc8aa0199931dc2f15b589", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "8a8c1c42a34349a0626d910abbad5a29136446b7", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b77b83f5529a26d084d64ece98abd6f0cc86e053", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "9193368408d792cec2057628d87862140fb1ce1c", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b95c33a4e743874f1b0a45bf2aaa4da553552bd1", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "1bd7947f1463c21edafa256d0fbec5b99215e2b6", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "cac0cb07f29ccfb373fd4a36c81e908ef3ce608c", "versionType": "git"}], "programFiles": ["fs/udf/partition.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.270", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.221", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.188", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.109", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.50", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.4", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/udf/partition.c"], "defaultStatus": "affected"}]}], "published": "2026-09-11T20:19:35.263", "references": [{"url": "https://git.kernel.org/stable/c/19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1bd7947f1463c21edafa256d0fbec5b99215e2b6", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8a8c1c42a34349a0626d910abbad5a29136446b7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9193368408d792cec2057628d87862140fb1ce1c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b77b83f5529a26d084d64ece98abd6f0cc86e053", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b95c33a4e743874f1b0a45bf2aaa4da553552bd1", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cac0cb07f29ccfb373fd4a36c81e908ef3ce608c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f64e01a90326bb85a3cc8aa0199931dc2f15b589", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "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 >= 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."}], "lastModified": "2026-09-14T13:19:08.273", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}