CVE-2022-50753

f2fs: fix to do sanity check on summary info

State: Published
Severity: 7.8 High
Published: Dec 24, 2025
Updated: Aug 5, 2026
Reserved: Dec 24, 2025

Description

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

f2fs: fix to do sanity check on summary info

As Wenqing Liu reported in bugzilla:

https://bugzilla.kernel.org/show_bug.cgi?id=216456

BUG: KASAN: use-after-free in recover_data+0x63ae/0x6ae0 [f2fs] Read of size 4 at addr ffff8881464dcd80 by task mount/1013

CPU: 3 PID: 1013 Comm: mount Tainted: G W 6.0.0-rc4 #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 Call Trace: dump_stack_lvl+0x45/0x5e print_report.cold+0xf3/0x68d kasan_report+0xa8/0x130 recover_data+0x63ae/0x6ae0 [f2fs] f2fs_recover_fsync_data+0x120d/0x1fc0 [f2fs] f2fs_fill_super+0x4665/0x61e0 [f2fs] mount_bdev+0x2cf/0x3b0 legacy_get_tree+0xed/0x1d0 vfs_get_tree+0x81/0x2b0 path_mount+0x47e/0x19d0 do_mount+0xce/0xf0 __x64_sys_mount+0x12c/0x1a0 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The root cause is: in fuzzed image, SSA table is corrupted: ofs_in_node is larger than ADDRS_PER_PAGE(), result in out-of-range access on 4k-size page.

- recover_data - do_recover_data - check_index_in_prev_nodes - f2fs_data_blkaddr

This patch adds sanity check on summary info in recovery and GC flow in where the flows rely on them.

After patch: [ 29.310883] F2FS-fs (loop0): Inconsistent ofs_in_node:65286 in summary, ino:0, nid:6, max:1018

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	b292dcab068e141d8a820b77cbcc88d98c610eb4 to before c99860f9a75079f339ed7670425b1ac58f26e2ffAffected b292dcab068e141d8a820b77cbcc88d98c610eb4 to before 4a8e8bf280703e04e0b9d91f101e1fdd9a5bd09eAffected b292dcab068e141d8a820b77cbcc88d98c610eb4 to before 73687c53919f49dff3852155621dab7a35c52854Affected b292dcab068e141d8a820b77cbcc88d98c610eb4 to before e168f819bfa42459b14f479e55ebd550bcc78899Affected b292dcab068e141d8a820b77cbcc88d98c610eb4 to before 0922ad64ccefa3e483e84355942b86e13c8fea68Affected b292dcab068e141d8a820b77cbcc88d98c610eb4 to before c6ad7fd16657ebd34a87a97d9588195aae87597dAffected
LinuxLinux	3.11Affected before 3.11Not affected 5.4.220 through 5.4.Not affected 5.10.150 through 5.10.Not affected 5.15.75 through 5.15.Not affected 5.19.17 through 5.19.Not affected 6.0.3 through 6.0.*Not affected 6.1 and laterNot affected

Product

Versions

LinuxLinux

b292dcab068e141d8a820b77cbcc88d98c610eb4 to before c99860f9a75079f339ed7670425b1ac58f26e2ffAffected
b292dcab068e141d8a820b77cbcc88d98c610eb4 to before 4a8e8bf280703e04e0b9d91f101e1fdd9a5bd09eAffected
b292dcab068e141d8a820b77cbcc88d98c610eb4 to before 73687c53919f49dff3852155621dab7a35c52854Affected
b292dcab068e141d8a820b77cbcc88d98c610eb4 to before e168f819bfa42459b14f479e55ebd550bcc78899Affected
b292dcab068e141d8a820b77cbcc88d98c610eb4 to before 0922ad64ccefa3e483e84355942b86e13c8fea68Affected
b292dcab068e141d8a820b77cbcc88d98c610eb4 to before c6ad7fd16657ebd34a87a97d9588195aae87597dAffected

LinuxLinux

3.11Affected
before 3.11Not affected
5.4.220 through 5.4.*Not affected
5.10.150 through 5.10.*Not affected
5.15.75 through 5.15.*Not affected
5.19.17 through 5.19.*Not affected
6.0.3 through 6.0.*Not affected
6.1 and laterNot affected

References

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