CVE-2026-45991udf: fix partition descriptor append bookkeeping
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ee4af50ca94f58afc3532662779b9cf80bbe27c8 before ad3c0c4400686f6f37b382aaa48fac2b9aefccbe; from ee4af50ca94f58afc3532662779b9cf80bbe27c8 before 68013a9bd4c01acd42073715f00e1a1992f089ee; from ee4af50ca94f58afc3532662779b9cf80bbe27c8 before e8474cfbac9ada2cdaa4eaedec22aadfa0f58559; from ee4af50ca94f58afc3532662779b9cf80bbe27c8 before 058b451b1039f056d1362c4fec2229e522366ab0; from ee4af50ca94f58afc3532662779b9cf80bbe27c8 before b5597bb83fc37b5b5da74a4453fa920b932cf39a; from ee4af50ca94f58afc3532662779b9cf80bbe27c8 before 73df74544b55241dca5dd788523e6f5f10bd2b9b; from ee4af50ca94f58afc3532662779b9cf80bbe27c8 before 08fa5d818e5bf53c7ca234d88ba334f32004e9b6; from ee4af50ca94f58afc3532662779b9cf80bbe27c8 before 08841b06fa64d8edbd1a21ca6e613420c90cc4b8; and 2 more ranges | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 4.18.7 before 4.19; from 4.19.1 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 7.0.4; 4.19; 4.19; 4.19; 4.19; and 4 more ranges | NVD |
References
- https://git.kernel.org/stable/c/ad3c0c4400686f6f37b382aaa48fac2b9aefccbe
- https://git.kernel.org/stable/c/68013a9bd4c01acd42073715f00e1a1992f089ee
- https://git.kernel.org/stable/c/e8474cfbac9ada2cdaa4eaedec22aadfa0f58559
- https://git.kernel.org/stable/c/058b451b1039f056d1362c4fec2229e522366ab0patch
- https://git.kernel.org/stable/c/b5597bb83fc37b5b5da74a4453fa920b932cf39apatch
- https://git.kernel.org/stable/c/73df74544b55241dca5dd788523e6f5f10bd2b9b
- https://git.kernel.org/stable/c/08fa5d818e5bf53c7ca234d88ba334f32004e9b6patch
- https://git.kernel.org/stable/c/08841b06fa64d8edbd1a21ca6e613420c90cc4b8patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.