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CVE Record

CVE-2022-49360: f2fs: fix to do sanity check on total_data_blocks

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to do sanity check on total_data_blocks As Yanming reported in bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215916 The kernel message is shown below: kernel BUG at fs/f2fs/segment.c:2560! Call Trace: allocate_segment_by_default+0x228/0x440 f2fs_allocate_data_block+0x13d1/0x31f0 do_write_page+0x18d/0x710 f2fs_outplace_write_data+0x151/0x250 f2fs_do_write_data_page+0xef9/0x1980 move_data_page+0x6af/0xbc0 do_garbage_collect+0x312f/0x46f0 f2fs_gc+0x6b0/0x3bc0 f2fs_balance_fs+0x921/0x2260 f2fs_write_single_data_page+0x16be/0x2370 f2fs_write_cache_pages+0x428/0xd00 f2fs_write_data_pages+0x96e/0xd50 do_writepages+0x168/0x550 __writeback_single_inode+0x9f/0x870 writeback_sb_inodes+0x47d/0xb20 __writeback_inodes_wb+0xb2/0x200 wb_writeback+0x4bd/0x660 wb_workfn+0x5f3/0xab0 process_one_work+0x79f/0x13e0 worker_thread+0x89/0xf60 kthread+0x26a/0x300 ret_from_fork+0x22/0x30 RIP: 0010:new_curseg+0xe8d/0x15f0 The root cause is: ckpt.valid_block_count is inconsistent with SIT table, stat info indicates filesystem has free blocks, but SIT table indicates filesystem has no free segment. So that during garbage colloection, it triggers panic when LFS allocator fails to find free segment. This patch tries to fix this issue by checking consistency in between ckpt.valid_block_count and block accounted from SIT.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue can cause a system panic when the F2FS filesystem has inconsistent block accounting. In business terms, exposed systems may crash or become unavailable if they use affected F2FS kernel code and encounter the inconsistent filesystem state described by the kernel maintainers.

Executive priority

Treat as a targeted availability risk for F2FS users, not a broad enterprise emergency based on the supplied evidence. Patch through normal kernel maintenance unless critical systems rely on F2FS.

Technical view

The F2FS fix adds a sanity check between ckpt.valid_block_count and blocks accounted from the SIT table. Without that consistency check, garbage collection can reach the LFS allocator with no free segment available and trigger a kernel BUG in new_curseg.

Likely exposure

Likely limited to Linux systems using F2FS on affected kernel versions or vendor kernels lacking the referenced stable fixes. The source bundle does not identify specific distributions, appliances, or cloud images.

Exploitation context

The bundle cites a kernel bug report and stable kernel fixes. It does not cite active exploitation, public exploit code, KEV inclusion, or a remote attack path.

Researcher notes

Evidence supports a kernel panic caused by inconsistent F2FS metadata accounting during garbage collection. Missing data includes CVSS, CWE, privilege requirements, attacker control assumptions, and distribution-specific affected ranges.

Mitigation direction

  • Update to a kernel containing the referenced F2FS stable fixes.
  • Check Linux distribution or appliance vendor advisories for backported fixes.
  • Prioritize systems that actively mount or write to F2FS filesystems.
  • If patching is delayed, reduce exposure to untrusted or suspect F2FS media.

Validation and detection

  • Inventory Linux systems that use F2FS filesystems.
  • Confirm kernel versions include a referenced stable fix or vendor backport.
  • Review kernel logs for F2FS garbage-collection BUG or panic traces.
  • Track vendor advisories because distribution versioning may differ from upstream Linux.
Prepared
Confidence
medium
Sources
7

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
6Source 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, 98e4da8ca301e062d79ae168c67e56f3c3de3ce4unaffected
LinuxLinux3.8, 0, 5.10.121, 5.15.46, 5.17.14, 5.18.3, 5.19affected
Weakness

CWE details

No CWE listed

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