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CVE Record

CVE-2022-50273: f2fs: fix to do sanity check on destination blkaddr during recovery

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to do sanity check on destination blkaddr during recovery As Wenqing Liu reported in bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=216456 loop5: detected capacity change from 0 to 131072 F2FS-fs (loop5): recover_inode: ino = 6, name = hln, inline = 1 F2FS-fs (loop5): recover_data: ino = 6 (i_size: recover) err = 0 F2FS-fs (loop5): recover_inode: ino = 6, name = hln, inline = 1 F2FS-fs (loop5): recover_data: ino = 6 (i_size: recover) err = 0 F2FS-fs (loop5): recover_inode: ino = 6, name = hln, inline = 1 F2FS-fs (loop5): recover_data: ino = 6 (i_size: recover) err = 0 F2FS-fs (loop5): Bitmap was wrongly set, blk:5634 ------------[ cut here ]------------ WARNING: CPU: 3 PID: 1013 at fs/f2fs/segment.c:2198 RIP: 0010:update_sit_entry+0xa55/0x10b0 [f2fs] Call Trace: <TASK> f2fs_do_replace_block+0xa98/0x1890 [f2fs] f2fs_replace_block+0xeb/0x180 [f2fs] recover_data+0x1a69/0x6ae0 [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 If we enable CONFIG_F2FS_CHECK_FS config, it will trigger a kernel panic instead of warning. The root cause is: in fuzzed image, SIT table is inconsistent with inode mapping table, result in triggering such warning during SIT table update. This patch introduces a new flag DATA_GENERIC_ENHANCE_UPDATE, w/ this flag, data block recovery flow can check destination blkaddr's validation in SIT table, and skip f2fs_replace_block() to avoid inconsistent status.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-50273 is a Linux kernel F2FS recovery flaw. A malformed F2FS image can leave filesystem metadata inconsistent, causing a kernel warning or panic when recovery updates block state. The main business risk is availability on systems that mount untrusted or corrupted F2FS filesystems.

Executive priority

Treat this as a targeted availability risk, not a broadly proven internet-facing emergency. Prioritize patching where F2FS is used with removable, user-supplied, or automated image mounting workflows.

Technical view

During F2FS fsync data recovery, the kernel could call f2fs_replace_block() with a destination block address whose SIT state did not match inode mapping metadata. The fix adds DATA_GENERIC_ENHANCE_UPDATE validation so recovery checks the destination block in the SIT table and skips replacement when inconsistent.

Likely exposure

Exposure is most plausible where Linux systems mount F2FS media, disk images, mobile/embedded storage, or test artifacts from untrusted sources. Systems not using F2FS, or not mounting attacker-controlled F2FS filesystems, have much lower practical exposure.

Exploitation context

The source describes a fuzzed image triggering warnings and, with CONFIG_F2FS_CHECK_FS, a kernel panic. It does not cite active exploitation, public weaponization, privilege escalation, or remote reachability. KEV status is false in the provided bundle.

Researcher notes

The evidence points to malformed filesystem recovery handling, not a network attack path. The bundle lacks CVSS, CWE, exploit status, and detailed affected range semantics beyond Linux kernel version markers and stable commit references.

Mitigation direction

  • Inventory Linux systems that enable or mount F2FS filesystems.
  • Apply the relevant Linux stable kernel update containing the referenced fixes.
  • Restrict mounting of untrusted F2FS media or disk images.
  • Check vendor or distribution advisories for packaged kernel availability.
  • Prioritize systems where kernel panics affect production availability.

Validation and detection

  • Confirm whether F2FS is enabled and used on affected Linux hosts.
  • Compare running kernel versions against vendor fixed kernel packages.
  • Review kernel logs for F2FS recovery warnings or panic reports.
  • Check whether CONFIG_F2FS_CHECK_FS is enabled in deployed kernels.
  • Verify update status using distribution-supported kernel metadata.
Prepared
Confidence
medium
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
7Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

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Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux98e4da8ca301e062d79ae168c67e56f3c3de3ce4, 98e4da8ca301e062d79ae168c67e56f3c3de3ce4, 98e4da8ca301e062d79ae168c67e56f3c3de3ce4, 98e4da8ca301e062d79ae168c67e56f3c3de3ce4, 98e4da8ca301e062d79ae168c67e56f3c3de3ce4, 98e4da8ca301e062d79ae168c67e56f3c3de3ce4unaffected
LinuxLinux3.8, 0, 5.4.220, 5.10.150, 5.15.75, 5.19.17, 6.0.3, 6.1affected
Weakness

CWE details

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