Description
In the Linux kernel, the following vulnerability has been resolved: udf: fix partition descriptor append bookkeeping Mounting a crafted UDF image with repeated partition descriptors can trigger a heap out-of-bounds write in part_descs_loc[]. handle_partition_descriptor() deduplicates entries by partition number, but appended slots never record partnum. As a result duplicate Partition Descriptors are appended repeatedly and num_part_descs keeps growing. Once the table is full, the growth path still sizes the allocation from partnum even though inserts are indexed by num_part_descs. If partnum is already aligned to PART_DESC_ALLOC_STEP, ALIGN(partnum, step) can keep the old capacity and the next append writes past the end of the table. Store partnum in the appended slot and size growth from the next append count so deduplication and capacity tracking follow the same model.
Affected products
linux: linux kernel
References9
- git.kernel.org/stable/c/058b451b1039f056d1362c4fec2229e522366ab0 Patch
- git.kernel.org/stable/c/08841b06fa64d8edbd1a21ca6e613420c90cc4b8 Patch
- git.kernel.org/stable/c/08fa5d818e5bf53c7ca234d88ba334f32004e9b6 Patch
- git.kernel.org/stable/c/b5597bb83fc37b5b5da74a4453fa920b932cf39a Patch
- git.kernel.org/stable/c/68013a9bd4c01acd42073715f00e1a1992f089ee
- git.kernel.org/stable/c/73df74544b55241dca5dd788523e6f5f10bd2b9b
- git.kernel.org/stable/c/ad3c0c4400686f6f37b382aaa48fac2b9aefccbe
- git.kernel.org/stable/c/e8474cfbac9ada2cdaa4eaedec22aadfa0f58559
- cert-portal.siemens.com/productcert/html/ssa-784472.html
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 7 · as of 14 November 2026
- CWE
- CWE-787
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