#VU102218 Race condition in Linux kernel - CVE-2024-56686
Vulnerability identifier: #VU102218
Vulnerability risk: Low
CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID:
CWE-ID:
CWE-362
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
Linux kernel
Operating systems & Components /
Operating system
Vendor: Linux Foundation
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition within the MODULE_ALIAS(), __ext4_read_bh(), ext4_read_bh_nowait(), ext4_read_bh(), ext4_read_bh_lock() and ext4_sb_breadahead_unmovable() functions in fs/ext4/super.c, within the ext4_get_bitmap() function in fs/ext4/resize.c, within the mext_page_mkuptodate() function in fs/ext4/move_extent.c, within the read_mmp_block() function in fs/ext4/mmp.c, within the trace_ext4_load_inode() function in fs/ext4/inode.c, within the ext4_get_branch() function in fs/ext4/indirect.c, within the ext4_read_inode_bitmap() function in fs/ext4/ialloc.c, within the __read_extent_tree_block() function in fs/ext4/extents.c, within the ext4_read_block_bitmap_nowait() and ext4_wait_block_bitmap() functions in fs/ext4/balloc.c. A local user can escalate privileges on the system.
Mitigation
Install update from vendor's website.
Vulnerable software versions
Linux kernel: 6.6, 6.6 rc1, 6.6 rc2, 6.6 rc3, 6.6 rc4, 6.6 rc5, 6.6 rc6, 6.6.1, 6.6.2, 6.6.3, 6.6.4, 6.6.5, 6.6.6, 6.6.7, 6.6.8, 6.6.9, 6.6.10, 6.6.11, 6.6.12, 6.6.13, 6.6.14, 6.6.15, 6.6.16, 6.6.17, 6.6.18, 6.6.19, 6.6.20, 6.6.21, 6.6.22, 6.6.23, 6.6.24, 6.6.25, 6.6.26, 6.6.27, 6.6.28, 6.6.29, 6.6.30, 6.6.31, 6.6.32, 6.6.33, 6.6.34, 6.6.35, 6.6.36, 6.6.37, 6.6.38, 6.6.39, 6.6.40, 6.6.41, 6.6.42, 6.6.43, 6.6.44, 6.6.45, 6.6.46, 6.6.47, 6.6.48, 6.6.49, 6.6.50, 6.6.51, 6.6.52, 6.6.53, 6.6.54, 6.6.55, 6.6.56, 6.6.57, 6.6.58, 6.6.59, 6.6.60, 6.6.61, 6.6.62, 6.6.63
External links
https://git.kernel.org/stable/c/25a5acf88fed59e060405bbb48098f4a3a2c2adc
https://git.kernel.org/stable/c/2f3d93e210b9c2866c8b3662adae427d5bf511ec
https://git.kernel.org/stable/c/61832ee7fa2fbd569d129379e795038abfb0d128
https://git.kernel.org/stable/c/77035e4d27e15f87ea55929c8bb8fb1970129e2f
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.64
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
