CVE-2024-53221 f2fs: fix null-ptr-deref in f2fs_submit_page_bio()
A null pointer dereference in the Linux kernel f2fs module can cause a system crash during concurrent module installation and filesystem mounting.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-53221?
CVE-2024-53221 is a medium-severity vulnerability in Linux kernel, published on 27 Dec 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix null-ptr-deref in f2fs_submit_page_bio()
There's issue as follows when concurrently installing the f2fs.ko module and mounting the f2fs file system: KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] RIP: 0010:__bio_alloc+0x2fb/0x6c0 [f2fs] Call Trace: <TASK> f2fs_submit_page_bio+0x126/0x8b0 [f2fs] __get_meta_page+0x1d4/0x920 [f2fs] get_checkpoint_version.constprop.0+0x2b/0x3c0 [f2fs] validate_checkpoint+0xac/0x290 [f2fs] f2fs_get_valid_checkpoint+0x207/0x950 [f2fs] f2fs_fill_super+0x1007/0x39b0 [f2fs] mount_bdev+0x183/0x250 legacy_get_tree+0xf4/0x1e0 vfs_get_tree+0x88/0x340 do_new_mount+0x283/0x5e0 path_mount+0x2b2/0x15b0 __x64_sys_mount+0x1fe/0x270 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e
Above issue happens as the biset of the f2fs file system is not initialized before register "f2fs_fs_type". To address above issue just register "f2fs_fs_type" at the last in init_f2fs_fs(). Ensure that all f2fs file system resources are initialized.
Weakness: CWE-476
Which versions are affected by CVE-2024-53221?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-53221?
Apply the vendor's patch.
Is CVE-2024-53221 being exploited?
There is no known exploitation of CVE-2024-53221 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-53221, DEBIAN-CVE-2024-53221, GHSA-376g-f56r-v5h4, ROOT-OS-DEBIAN-11-CVE-2024-53221, ROOT-OS-DEBIAN-12-CVE-2024-53221, ROOT-OS-UBUNTU-2204-CVE-2024-53221 and 1 more.