CVE-2021-47353

udf: Fix NULL pointer dereference in udf_symlink function

Description

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.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.01%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/2f3d9ddd32a28803baa547e6274983b67d5e287c patch
https://git.kernel.org/stable/c/371566f63cbd0bb6fbb25b8fe9d5798268d35af9 patch
https://git.kernel.org/stable/c/baea588a42d675e35daeaddd10fbc9700550bc4d patch
https://git.kernel.org/stable/c/3638705ecd5ad2785e996f820121c0ad15ce64b5 patch
https://git.kernel.org/stable/c/80d505aee6398cf8beb72475c7edcf1733c1c68b patch
https://git.kernel.org/stable/c/21bf1414580c36ffc8d8de043beb3508cf812238 patch
https://git.kernel.org/stable/c/aebed6b19e51a34003d998da5ebb1dfdd2cb1d02 patch
https://git.kernel.org/stable/c/5150877e4d99f85057a458daac7cd7c01005d5c6 patch
https://git.kernel.org/stable/c/fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43 patch

Frequently Asked Questions

What is the severity of CVE-2021-47353?
CVE-2021-47353 has been scored as a medium severity vulnerability.
How to fix CVE-2021-47353?
To fix CVE-2021-47353, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47353 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47353 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47353?
CVE-2021-47353 affects Linux Linux, Linux Linux.
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