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CVE-2026-45991 is a heap out-of-bounds write vulnerability in the Linux kernel UDF filesystem implementation. Mounting a crafted UDF image containing repeated partition descriptors can corrupt the partition descriptor table. The handle_partition_descriptor() function deduplicates entries by partition number, but newly appended slots fail to record partnum, allowing duplicate descriptors to be appended repeatedly and increasing num_part_descs. Allocation growth incorrectly uses partnum rather than the insertion count. When partnum is already aligned to PART_DESC_ALLOC_STEP, growth can retain the existing capacity, allowing the next append to write beyond the table.
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A partition-descriptor append bookkeeping flaw in the Linux kernel UDF filesystem implementation. The advisory does not describe its specific exploitation impact. A patched kernel is available through RHSA-2026:77216 and requires a reboot.
A vulnerability involving partition-descriptor append bookkeeping in the Linux kernel UDF filesystem. The advisory does not specify the exploitation conditions or impact. A kernel patch is available through RHSA-2026:77217 and requires a reboot.
A partition-descriptor append bookkeeping vulnerability in the Linux kernel UDF filesystem implementation. The content does not specify the precise security impact.
A Linux kernel UDF partition-descriptor bookkeeping flaw causes duplicate descriptors to be appended repeatedly while allocation growth uses the partition number rather than the append count. Mounting a crafted UDF image can consequently cause a heap out-of-bounds write. The reference assigns a CVSS v3 base score of 7.8, with local access and low privileges required.
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Cross-references every affected SKU, including bundled OEM variants.
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