CVE-2024-53066

nfs: Fix KMSAN warning in decode_getfattr_attrs()

State: Published
Severity: 9.8 Critical
Published: Nov 19, 2024
Updated: Aug 5, 2026
Reserved: Nov 19, 2024

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().

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-908 Use of Uninitialized Resource

Affected Products

Product	Versions
LinuxLinux	88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before 25ffd294fef81a7f3cd9528adf21560c04d98747Affected 88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before bbfcd261cc068fe1cd02a4e871275074a0daa4e2Affected 88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before 8fc5ea9231af9122d227c9c13f5e578fca48d2e3Affected 88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before 9b453e8b108a5a93a6e348cf2ba4c9c138314a00Affected 88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before f6b2b2b981af8e7d7c62d34143acefa4e1edfe8bAffected 88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before f749cb60a01f8391c760a1d6ecd938cadacf9549Affected 88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before 9be0a21ae52b3b822d0eec4d14e909ab394f8a92Affected 88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before dc270d7159699ad6d11decadfce9633f0f71c1dbAffected
LinuxLinux	3.5Affected before 3.5Not affected 4.19.324 through 4.19.Not affected 5.4.286 through 5.4.Not affected 5.10.230 through 5.10.Not affected 5.15.172 through 5.15.Not affected 6.1.117 through 6.1.Not affected 6.6.61 through 6.6.Not affected 6.11.8 through 6.11.*Not affected 6.12 and laterNot affected

Product

Versions

LinuxLinux

88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before 25ffd294fef81a7f3cd9528adf21560c04d98747Affected
88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before bbfcd261cc068fe1cd02a4e871275074a0daa4e2Affected
88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before 8fc5ea9231af9122d227c9c13f5e578fca48d2e3Affected
88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before 9b453e8b108a5a93a6e348cf2ba4c9c138314a00Affected
88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before f6b2b2b981af8e7d7c62d34143acefa4e1edfe8bAffected
88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before f749cb60a01f8391c760a1d6ecd938cadacf9549Affected
88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before 9be0a21ae52b3b822d0eec4d14e909ab394f8a92Affected
88034c3d88c2c48b215f2cc5eb22e564aa817f9c to before dc270d7159699ad6d11decadfce9633f0f71c1dbAffected

LinuxLinux

3.5Affected
before 3.5Not affected
4.19.324 through 4.19.*Not affected
5.4.286 through 5.4.*Not affected
5.10.230 through 5.10.*Not affected
5.15.172 through 5.15.*Not affected
6.1.117 through 6.1.*Not affected
6.6.61 through 6.6.*Not affected
6.11.8 through 6.11.*Not affected
6.12 and laterNot affected

References

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