Bugzilla – Bug 1220252
VUL-0: CVE-2024-26590: kernel-source,kernel-source-azure,kernel-source-rt: erofs: fix inconsistent per-file compression format
Last modified: 2024-05-15 16:55:03 UTC
In the Linux kernel, the following vulnerability has been resolved: erofs: fix inconsistent per-file compression format EROFS can select compression algorithms on a per-file basis, and each per-file compression algorithm needs to be marked in the on-disk superblock for initialization. However, syzkaller can generate inconsistent crafted images that use an unsupported algorithmtype for specific inodes, e.g. use MicroLZMA algorithmtype even it's not set in `sbi->available_compr_algs`. This can lead to an unexpected "BUG: kernel NULL pointer dereference" if the corresponding decompressor isn't built-in. Fix this by checking against `sbi->available_compr_algs` for each m_algorithmformat request. Incorrect !erofs_sb_has_compr_cfgs preset bitmap is now fixed together since it was harmless previously. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-26590 https://www.cve.org/CVERecord?id=CVE-2024-26590 https://lore.kernel.org/linux-cve-announce/2024022259-CVE-2024-26590-85a4@gregkh/T/#u Patch: https://git.kernel.org/stable/c/118a8cf504d7dfa519562d000f423ee3ca75d2c4
Tracking as affected: - SLE15-SP6