CVE-2026-89525
CVE CVE-2026-89525EUVD EUVD-2026-76431Published 2026-09-11T19:44:06.000ZLast changed 2026-09-14T12:00:41.000Z
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 6.6.157; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1bd7947f1463c21edafa256d0fbec5b99215e2b6; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b77b83f5529a26d084d64ece98abd6f0cc86e053; 2.6.12; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9193368408d792cec2057628d87862140fb1ce1c; patch: 6.18.50; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f64e01a90326bb85a3cc8aa0199931dc2f15b589; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8a8c1c42a34349a0626d910abbad5a29136446b7; patch: 5.10.270; patch: 7.2.4; patch: 5.15.221; patch: 6.12.109; patch: 6.1.188; patch: 7.3-rc1; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b95c33a4e743874f1b0a45bf2aaa4da553552bd1; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cac0cb07f29ccfb373fd4a36c81e908ef3ce608c; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4; patch: 0
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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