CVE-2024-53066 nfs: Fix KMSAN warning in decode_getfattr_attrs()
An uninitialized pointer in the Linux kernel NFS client can cause a crash when processing file attributes, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-53066?
CVE-2024-53066 is a critical vulnerability in Linux kernel, published on 19 Nov 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
nfs: Fix KMSAN warning in decode_getfattr_attrs()
Fix the following KMSAN warning:
CPU: 1 UID: 0 PID: 7651 Comm: cp Tainted: G B Tainted: [B]=BAD_PAGE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009) ===================================================== ===================================================== BUG: KMSAN: uninit-value in decode_getfattr_attrs+0x2d6d/0x2f90 decode_getfattr_attrs+0x2d6d/0x2f90 decode_getfattr_generic+0x806/0xb00 nfs4_xdr_dec_getattr+0x1de/0x240 rpcauth_unwrap_resp_decode+0xab/0x100 rpcauth_unwrap_resp+0x95/0xc0 call_decode+0x4ff/0xb50 __rpc_execute+0x57b/0x19d0 rpc_execute+0x368/0x5e0 rpc_run_task+0xcfe/0xee0 nfs4_proc_getattr+0x5b5/0x990 __nfs_revalidate_inode+0x477/0xd00 nfs_access_get_cached+0x1021/0x1cc0 nfs_do_access+0x9f/0xae0 nfs_permission+0x1e4/0x8c0 inode_permission+0x356/0x6c0 link_path_walk+0x958/0x1330 path_lookupat+0xce/0x6b0 filename_lookup+0x23e/0x770 vfs_statx+0xe7/0x970 vfs_fstatat+0x1f2/0x2c0 __se_sys_newfstatat+0x67/0x880 __x64_sys_newfstatat+0xbd/0x120 x64_sys_call+0x1826/0x3cf0 do_syscall_64+0xd0/0x1b0 entry_SYSCALL_64_after_hwframe+0x77/0x7f
The KMSAN warning is triggered in decode_getfattr_attrs(), when calling decode_attr_mdsthreshold(). It appears that fattr->mdsthreshold is not initialized.
Fix the issue by initializing fattr->mdsthreshold to NULL in nfs_fattr_init().
Weakness: CWE-908
Which versions are affected by CVE-2024-53066?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-53066?
Apply the vendor's patch.
Is CVE-2024-53066 being exploited?
There is no known exploitation of CVE-2024-53066 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-53909, AZL-53915, BELL-CVE-2024-53066, DEBIAN-CVE-2024-53066, GHSA-fc6c-wh46-2q9r, UBUNTU-CVE-2024-53066.