Answer in brief
CVE-2026-89525 records a Unknown severity vulnerability in udf: reject VAT indexes equal to the entry count. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9193368408d792cec2057628d87862140fb1ce1c || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b95c33a4e743874f1b0a45bf2aaa4da553552bd1 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1bd7947f1463c21edafa256d0fbec5b99215e2b6 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cac0cb07f29ccfb373fd4a36c81e908ef3ce608c | 9193368408d792cec2057628d87862140fb1ce1c, b95c33a4e743874f1b0a45bf2aaa4da553552bd1, 1bd7947f1463c21edafa256d0fbec5b99215e2b6, cac0cb07f29ccfb373fd4a36c81e908ef3ce608c |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.