CVE-2022-49418

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

NFSv4: Fix free of uninitialized nfs4_label on referral lookup.

Send along the already-allocated fattr along with nfs4_fs_locations, and

drop the memcpy of fattr. We end up growing two more allocations, but this

fixes up a crash as:

PID: 790 TASK: ffff88811b43c000 CPU: 0 COMMAND: "ls"

#0 [ffffc90000857920] panic at ffffffff81b9bfde

#1 [ffffc900008579c0] do_trap at ffffffff81023a9b

#2 [ffffc90000857a10] do_error_trap at ffffffff81023b78

#3 [ffffc90000857a58] exc_stack_segment at ffffffff81be1f45

#4 [ffffc90000857a80] asm_exc_stack_segment at ffffffff81c009de

#5 [ffffc90000857b08] nfs_lookup at ffffffffa0302322 [nfs]

#6 [ffffc90000857b70] __lookup_slow at ffffffff813a4a5f

#7 [ffffc90000857c60] walk_component at ffffffff813a86c4

#8 [ffffc90000857cb8] path_lookupat at ffffffff813a9553

#9 [ffffc90000857cf0] filename_lookup at ffffffff813ab86b

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References