CVE-2021-47353

MEDIUM
Published May 21, 2024 Modified Dec 24, 2024 CWE-476

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.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2021-47353? +
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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2021-47353? +
CVE-2021-47353 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2021-47353? +
CVE-2021-47353 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2021-47353? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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