AZL-100397
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-100397.json
- JSON Data
- https://api.osv.dev/v1/vulns/AZL-100397
- Upstream
- Published
- 2026-09-11T20:19:35Z
- Modified
- 2026-09-12T14:15:21Z
- Summary
- CVE-2026-89525 affecting package kernel 6.6.150.1-1
- Details
-
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.
- References