CVE-2021-47353: udf: Fix NULL pointer dereference in udf_symlink function
First published: Tue May 21 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <4.4.276 | 4.4.276 |
| redhat/kernel | <4.9.276 | 4.9.276 |
| redhat/kernel | <4.14.240 | 4.14.240 |
| redhat/kernel | <4.19.198 | 4.19.198 |
| redhat/kernel | <5.4.133 | 5.4.133 |
| redhat/kernel | <5.10.51 | 5.10.51 |
| redhat/kernel | <5.12.18 | 5.12.18 |
| redhat/kernel | <5.13.3 | 5.13.3 |
| redhat/kernel | <5.14 | 5.14 |
| Linux Kernel | <4.4.276 | |
| Linux Kernel | >=4.5<4.9.276 | |
| Linux Kernel | >=4.10<4.14.240 | |
| Linux Kernel | >=4.15<4.19.198 | |
| Linux Kernel | >=4.20<5.4.133 | |
| Linux Kernel | >=5.5<5.10.51 | |
| Linux Kernel | >=5.11<5.12.18 | |
| Linux Kernel | >=5.13<5.13.3 | |
| IBM Security Verify Governance - Identity Manager | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Software Stack | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Virtual Appliance | <=ISVG 10.0.2 | |
| IBM Security Verify Governance Identity Manager Container | <=ISVG 10.0.2 |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2021-47353
- https://lore.kernel.org/linux-cve-announce/2024052141-CVE-2021-47353-8d3a@gregkh/T
- https://access.redhat.com/errata/RHSA-2024:4211
- https://access.redhat.com/errata/RHSA-2024:4352
- https://bugzilla.redhat.com/show_bug.cgi?id=2282400
- https://git.kernel.org/stable/c/2f3d9ddd32a28803baa547e6274983b67d5e287c
- https://git.kernel.org/stable/c/371566f63cbd0bb6fbb25b8fe9d5798268d35af9
- https://git.kernel.org/stable/c/baea588a42d675e35daeaddd10fbc9700550bc4d
- https://git.kernel.org/stable/c/3638705ecd5ad2785e996f820121c0ad15ce64b5
- https://git.kernel.org/stable/c/80d505aee6398cf8beb72475c7edcf1733c1c68b
- https://git.kernel.org/stable/c/21bf1414580c36ffc8d8de043beb3508cf812238
- https://git.kernel.org/stable/c/aebed6b19e51a34003d998da5ebb1dfdd2cb1d02
- https://git.kernel.org/stable/c/5150877e4d99f85057a458daac7cd7c01005d5c6
- https://git.kernel.org/stable/c/fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43
- https://www.ibm.com/support/pages/node/7230443 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2021-47353?
CVE-2021-47353 has a medium severity level as it involves a NULL pointer dereference in the Linux kernel.
How do I fix CVE-2021-47353?
To fix CVE-2021-47353, update the Linux kernel to versions 4.4.276, 4.9.276, 4.14.240, 4.19.198, 5.4.133, 5.10.51, 5.12.18, 5.13.3, or 5.14.
What software is affected by CVE-2021-47353?
CVE-2021-47353 affects various Linux kernel versions prior to the mentioned patched versions.
Is CVE-2021-47353 publicly known?
Yes, CVE-2021-47353 is publicly disclosed and information regarding it can be found in security advisories.
What is the potential impact of CVE-2021-47353?
The potential impact of CVE-2021-47353 includes system crashes or denial of service due to unexpected behavior from the NULL pointer dereference.
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