CVE-2026-93055: UDF symlink pathComponent header OOB read

CVE-2026-93055: UDF symlink pathComponent header OOB read

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

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.

The Linux kernel CVE team has assigned CVE-2026-93055 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.10.270 with commit d9f49c8b55debf1512f912077b6c759cc8b6d2e0
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.15.221 with commit 48b2a74317e15f93983c74a5a07245bc94a00d39
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.1.188 with commit f44f5f795f1a56249821a05183347ea025855e31
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.6.157 with commit 57371e743398e0d485f0f7beede1ade41f812324
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.12.110 with commit ee264227b656218bc1b257d8e4f83467f5f17723
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.18.52 with commit 8da8fd3df9fc14cf79ca3a3978d27ba067985111
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 7.2.6 with commit b21cb958292ee1e02eb305ff9de09f2f7edd551a
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 7.3-rc1 with commit d23eb7380d1594cda31a5dc8487dd2a5c8def8c7

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-93055
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	fs/udf/symlink.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/d9f49c8b55debf1512f912077b6c759cc8b6d2e0
	https://git.kernel.org/stable/c/48b2a74317e15f93983c74a5a07245bc94a00d39
	https://git.kernel.org/stable/c/f44f5f795f1a56249821a05183347ea025855e31
	https://git.kernel.org/stable/c/57371e743398e0d485f0f7beede1ade41f812324
	https://git.kernel.org/stable/c/ee264227b656218bc1b257d8e4f83467f5f17723
	https://git.kernel.org/stable/c/8da8fd3df9fc14cf79ca3a3978d27ba067985111
	https://git.kernel.org/stable/c/b21cb958292ee1e02eb305ff9de09f2f7edd551a
	https://git.kernel.org/stable/c/d23eb7380d1594cda31a5dc8487dd2a5c8def8c7