CVE-2021-47353

low-risk

Published 2024-05-21

In the Linux kernel, the following vulnerability has been resolved: udf: Fix NULL pointer dereference in udf_symlink function In function udf_symlink, epos.bh is assigned with the value returned by udf_tgetblk. The function udf_tgetblk is defined in udf/misc.c and returns the value of sb_getblk function that could be NULL. Then, epos.bh is used without any check, causing a possible NULL pointer dereference when sb_getblk fails. This fix adds a check to validate the value of epos.bh.

Do I need to act?

0.01% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.5/10 Medium

LOCAL / LOW complexity

Affected Products (1)

Linux Kernel

Affected Vendors

Linux

References (18)

Patch https://git.kernel.org/stable/c/21bf1414580c36ffc8d8de043beb3508cf812238

Patch https://git.kernel.org/stable/c/2f3d9ddd32a28803baa547e6274983b67d5e287c

Patch https://git.kernel.org/stable/c/3638705ecd5ad2785e996f820121c0ad15ce64b5

Patch https://git.kernel.org/stable/c/371566f63cbd0bb6fbb25b8fe9d5798268d35af9

Patch https://git.kernel.org/stable/c/5150877e4d99f85057a458daac7cd7c01005d5c6

Patch https://git.kernel.org/stable/c/80d505aee6398cf8beb72475c7edcf1733c1c68b

Patch https://git.kernel.org/stable/c/aebed6b19e51a34003d998da5ebb1dfdd2cb1d02

Patch https://git.kernel.org/stable/c/baea588a42d675e35daeaddd10fbc9700550bc4d

Patch https://git.kernel.org/stable/c/fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43