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 Linux kernel | <4.4.276 | |
| Linux Linux kernel | >=4.5<4.9.276 | |
| Linux Linux kernel | >=4.10<4.14.240 | |
| Linux Linux kernel | >=4.15<4.19.198 | |
| Linux Linux kernel | >=4.20<5.4.133 | |
| Linux Linux kernel | >=5.5<5.10.51 | |
| Linux Linux kernel | >=5.11<5.12.18 | |
| Linux Linux kernel | >=5.13<5.13.3 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- 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://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
- agent/title
- agent/weakness
- agent/first-publish-date
- agent/type
- agent/author
- agent/event
- agent/description
- agent/references
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2021-47353
- agent/software-canonical-lookup
- collector/mitre-cve
- source/MITRE
- collector/nvd-api
- source/NVD
- agent/remedy
- agent/softwarecombine
- agent/severity
- agent/last-modified-date
- agent/tags
- package-manager/redhat
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/4.5
- version/linux linux kernel/4.10
- version/linux linux kernel/4.15
- version/linux linux kernel/4.20
- version/linux linux kernel/5.5
- version/linux linux kernel/5.11
- version/linux linux kernel/5.13