CVE-2026-89525udf: reject VAT indexes equal to the entry count
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No exploitation reported and no EPSS estimate yet.
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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
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f64e01a90326bb85a3cc8aa0199931dc2f15b589; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8a8c1c42a34349a0626d910abbad5a29136446b7; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before b77b83f5529a26d084d64ece98abd6f0cc86e053; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9193368408d792cec2057628d87862140fb1ce1c; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before b95c33a4e743874f1b0a45bf2aaa4da553552bd1; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 builds before 1bd7947f1463c21edafa256d0fbec5b99215e2b6; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before cac0cb07f29ccfb373fd4a36c81e908ef3ce608c | CNA record |
References
- https://git.kernel.org/stable/c/f64e01a90326bb85a3cc8aa0199931dc2f15b589
- https://git.kernel.org/stable/c/8a8c1c42a34349a0626d910abbad5a29136446b7
- https://git.kernel.org/stable/c/19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4
- https://git.kernel.org/stable/c/b77b83f5529a26d084d64ece98abd6f0cc86e053
- https://git.kernel.org/stable/c/9193368408d792cec2057628d87862140fb1ce1c
- https://git.kernel.org/stable/c/b95c33a4e743874f1b0a45bf2aaa4da553552bd1
- https://git.kernel.org/stable/c/1bd7947f1463c21edafa256d0fbec5b99215e2b6
- https://git.kernel.org/stable/c/cac0cb07f29ccfb373fd4a36c81e908ef3ce608c
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.