Paper/Archive/CVE-2022-49418

CVE-2022-49418

Linux Linux — NFSv4: Fix free of uninitialized nfs4_label on referral lookup.

CVSS 9.8 (CNA)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 44.9.449 × 209.0 No public exploit+100.0 SSVC exploitation: unknown+100.0

Description · from the CVE record

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

Affected

ProductAffectedFixed inSource

Linux9558a007dbc383d48e7f5a123d0b5ff656c71068 – < 6015292653d95ba9f72906e2b65e536aa5807d646015292653d95ba9f72906e2b65e536aa5807d64CNA

Linux9558a007dbc383d48e7f5a123d0b5ff656c71068 – < c3ed222745d9ad7b69299b349a64ba533c64a34fc3ed222745d9ad7b69299b349a64ba533c64a34fCNA

Linux5.165.18.3CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

refgit.kernel.org/stable/c/6015292653d95ba9f72906e2b65e536aa5807d64 refgit.kernel.org/stable/c/c3ed222745d9ad7b69299b349a64ba533c64a34f