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 |
|---|---|---|
| Linux Linux kernel | <=5.18.19 | |
| redhat/Kernel | <5.19 | 5.19 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.6-1 6.12.9-1 |
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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
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