Bug 2536357 (CVE-2026-93055)

Summary: CVE-2026-93055 kernel: UDF symlink pathComponent header OOB read
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel. When processing Universal Disk Format (UDF) symlink data, a specially crafted input could cause an out-of-bounds read. This occurs because the `udf_symlink_filler()` function may process a partial `pathComponent` header, leading to the `udf_pc_to_char()` function attempting to read beyond its allocated buffer. This vulnerability could potentially lead to information disclosure or a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description OSIDB Bzimport 2026-09-17 17:33:08 UTC 
In the Linux kernel, the following vulnerability has been resolved:

UDF symlink pathComponent header OOB read

udf_symlink_filler() can enter udf_pc_to_char() with a partial pathComponent header.

Validate that enough input remains for a complete pathComponent header
before accessing it. Reject malformed symlink data that would otherwise
make udf_pc_to_char() perform an out-of-bounds read.
Comment 1 gkamathe 2026-09-19 20:46:43 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93055.mbox