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CVE Record

CVE-2023-53301: f2fs: fix kernel crash due to null io->bio

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix kernel crash due to null io->bio We should return when io->bio is null before doing anything. Otherwise, panic. BUG: kernel NULL pointer dereference, address: 0000000000000010 RIP: 0010:__submit_merged_write_cond+0x164/0x240 [f2fs] Call Trace: <TASK> f2fs_submit_merged_write+0x1d/0x30 [f2fs] commit_checkpoint+0x110/0x1e0 [f2fs] f2fs_write_checkpoint+0x9f7/0xf00 [f2fs] ? __pfx_issue_checkpoint_thread+0x10/0x10 [f2fs] __checkpoint_and_complete_reqs+0x84/0x190 [f2fs] ? preempt_count_add+0x82/0xc0 ? __pfx_issue_checkpoint_thread+0x10/0x10 [f2fs] issue_checkpoint_thread+0x4c/0xf0 [f2fs] ? __pfx_autoremove_wake_function+0x10/0x10 kthread+0xff/0x130 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2c/0x50 </TASK>

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2023-53301 is a Linux kernel f2fs filesystem bug that can trigger a kernel crash when checkpoint write handling encounters a missing bio object. The documented impact is availability: affected systems may panic and reboot. The source bundle does not show data theft, privilege escalation, or confirmed real-world exploitation.

Executive priority

Treat as a planned availability-risk kernel update, higher priority for systems using f2fs or requiring strong uptime. There is no source-backed evidence here for emergency response due to active exploitation.

Technical view

The flaw is a NULL pointer dereference in f2fs __submit_merged_write_cond, reached through f2fs_submit_merged_write and checkpoint paths. The fix returns early when io->bio is null. Public data lists Linux kernel f2fs versions around 5.18 with fixes referenced for stable kernel lines including 6.1.16, 6.2.3, and 6.3.

Likely exposure

Exposure is most likely on Linux systems using or supporting f2fs on affected kernel builds. Systems not using f2fs may have lower practical exposure, but package-level status depends on distribution backports and kernel configuration.

Exploitation context

The bundle marks KEV as false and provides no evidence of active exploitation. It documents a crash trace and kernel fix, but not attacker prerequisites, remote reachability, or exploitability beyond denial-of-service behavior.

Researcher notes

Evidence is limited to the CVE description and upstream stable references. The crash path is clear, but source data does not establish attack vector, required privileges, CVSS, CWE, or exploit availability. Validate distro backports before declaring systems vulnerable.

Mitigation direction

  • Check vendor or distribution advisories for fixed kernel packages.
  • Prioritize updating kernels containing the referenced stable f2fs fix.
  • Confirm whether f2fs is enabled, loaded, or used on production systems.
  • Apply normal kernel reboot planning after patch installation.

Validation and detection

  • Inventory kernel versions and map them to vendor fixed builds.
  • Check whether f2fs filesystems are mounted or supported by the running kernel.
  • Review crash logs for f2fs checkpoint or NULL pointer traces.
  • Verify the vendor kernel includes the referenced upstream fix commits.
Prepared
Confidence
medium
Sources
5

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

Conservative CVE-to-ATT&CK context

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CVE-2023-53301 mapping review

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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
4Source 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

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux64bf0eef0171912f7c2f3ea30ee6ad7a2ad0a511, 64bf0eef0171912f7c2f3ea30ee6ad7a2ad0a511, 64bf0eef0171912f7c2f3ea30ee6ad7a2ad0a511unaffected
LinuxLinux5.18, 0, 6.1.16, 6.2.3, 6.3affected
Weakness

CWE details

No CWE listed

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