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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade perf-debuginfoUpgrade python3-perfUpgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade kernel-modules-extraUpgrade kernelUpgrade bpftool-debuginfoUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade kernel-develUpgrade kernel-toolsUpgrade python3-perf-debuginfoUpgrade kernel-tools-develUpgrade bpftoolUpgrade kernel-livepatch-6.1.188-233.385Upgrade kernel-modules-extra-common | Oct 13, 2026 | Sep 11, 2026 |
| Debian | — | Upgrade linux-6.12Upgrade linux | Sep 30, 2026 | Sep 11, 2026 |
| Redhat_linux | — | No solution exists | Sep 16, 2026 | Sep 11, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 21, 2026 | Sep 11, 2026 |
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