CVE-2026-89525 (GCVE-0-2026-89525)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-10-19 08:48
VLAI
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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6638 records in the last 180 days details
References
Impacted 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 Create a notification for this product.
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 Create a notification for this product.
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      "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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