CVE-2023-4385: Kernel: jfs: null pointer dereference in dbfree()
First published: Mon Jul 03 2023(Updated: )
A NULL pointer dereference flaw was found in dbFree in fs/jfs/jfs_dmap.c in journaling file system (JFS) in the Linux Kernel. In this flaw, a local attacker may crash the system due to a missing sanity check. In our fault-injection testing, the variable "nblocks" in dbFree() can be zero when kmalloc_array() fails in dtSearch(). In this case, the variable "mp" in dbFree() would be NULL and then it is dereferenced in "write_metapage(mp)". References: <a href="https://github.com/torvalds/linux/commit/0d4837fdb796f99369cf7691d33de1b856bcaf1f">https://github.com/torvalds/linux/commit/0d4837fdb796f99369cf7691d33de1b856bcaf1f</a>
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/Kernel | <5.19 | 5.19 |
| Linux Kernel | <=5.18.19 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.17-1 |
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://access.redhat.com/security/cve/CVE-2023-4385
- https://bugzilla.redhat.com/show_bug.cgi?id=2219272
- https://github.com/torvalds/linux/commit/0d4837fdb796f99369cf7691d33de1b856bcaf1f
- https://launchpad.net/bugs/cve/CVE-2023-4385
- https://access.redhat.com/security/cve/cve-2023-4385
- https://git.kernel.org/linus/0d4837fdb796f99369cf7691d33de1b856bcaf1f
- https://security-tracker.debian.org/tracker/CVE-2023-4385
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4385
- https://nvd.nist.gov/vuln/detail/CVE-2023-4385
- https://ubuntu.com/security/CVE-2023-4385
Frequently Asked Questions
What is the severity of CVE-2023-4385?
CVE-2023-4385 is classified as a high-severity vulnerability due to its potential to crash the system.
How do I fix CVE-2023-4385?
To fix CVE-2023-4385, update the Linux kernel to version 5.19 or later.
What software is affected by CVE-2023-4385?
CVE-2023-4385 affects multiple versions of the Linux kernel, specifically versions up to 5.18.19 and certain specified versions in the 5.10 and 6.1 series.
Who can exploit CVE-2023-4385?
CVE-2023-4385 can be exploited by a local attacker who can trigger a NULL pointer dereference.
What does CVE-2023-4385 exploit in the Linux kernel?
CVE-2023-4385 exploits a NULL pointer dereference in the dbFree function of the journaling file system (JFS) in the Linux kernel.
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- agent/author
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2023-4385
- agent/software-canonical-lookup
- agent/weakness
- agent/severity
- agent/title
- collector/mitre-cve
- source/MITRE
- agent/remedy
- agent/references
- collector/usn-cve
- source/Ubuntu
- agent/description
- agent/last-modified-date
- agent/event
- agent/trending
- agent/source
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup-request
- collector/nvd-cve
- collector/nvd-index
- agent/softwarecombine
- agent/tags
- collector/security-tracker-debian
- source/Debian
- package-manager/redhat
- vendor/linux
- canonical/linux kernel
- version/linux kernel/5.18.19
- package-manager/debian