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CVE Record

CVE-2024-44941: f2fs: fix to cover read extent cache access with lock

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to cover read extent cache access with lock syzbot reports a f2fs bug as below: BUG: KASAN: slab-use-after-free in sanity_check_extent_cache+0x370/0x410 fs/f2fs/extent_cache.c:46 Read of size 4 at addr ffff8880739ab220 by task syz-executor200/5097 CPU: 0 PID: 5097 Comm: syz-executor200 Not tainted 6.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 sanity_check_extent_cache+0x370/0x410 fs/f2fs/extent_cache.c:46 do_read_inode fs/f2fs/inode.c:509 [inline] f2fs_iget+0x33e1/0x46e0 fs/f2fs/inode.c:560 f2fs_nfs_get_inode+0x74/0x100 fs/f2fs/super.c:3237 generic_fh_to_dentry+0x9f/0xf0 fs/libfs.c:1413 exportfs_decode_fh_raw+0x152/0x5f0 fs/exportfs/expfs.c:444 exportfs_decode_fh+0x3c/0x80 fs/exportfs/expfs.c:584 do_handle_to_path fs/fhandle.c:155 [inline] handle_to_path fs/fhandle.c:210 [inline] do_handle_open+0x495/0x650 fs/fhandle.c:226 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f We missed to cover sanity_check_extent_cache() w/ extent cache lock, so, below race case may happen, result in use after free issue. - f2fs_iget - do_read_inode - f2fs_init_read_extent_tree : add largest extent entry in to cache - shrink - f2fs_shrink_read_extent_tree - __shrink_extent_tree - __detach_extent_node : drop largest extent entry - sanity_check_extent_cache : access et->largest w/o lock let's refactor sanity_check_extent_cache() to avoid extent cache access and call it before f2fs_init_read_extent_tree() to fix this issue.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2024-44941 is a Linux kernel bug in F2FS, the Flash-Friendly File System. A race condition can make the kernel read freed memory while loading an inode, causing a kernel memory-safety failure and likely system instability. The source bundle gives no CVSS score or confirmed real-world impact.

Executive priority

Treat this as a targeted kernel maintenance item, not an emergency based on current evidence. Patch during normal kernel update cycles, with higher priority for systems using F2FS or processing untrusted storage media.

Technical view

The issue is a use-after-free in F2FS extent cache handling. sanity_check_extent_cache() accessed read extent cache state without the required lock while another path could shrink and detach the largest extent entry. The fix refactors the check to avoid unlocked extent-cache access and calls it before initializing the read extent tree.

Likely exposure

Exposure is most likely on Linux systems that mount or process F2FS filesystems on affected kernel versions. The bundle does not prove remote reachability, privilege requirements, or whether common distributions shipped the vulnerable code unchanged.

Exploitation context

The report came from syzbot with a KASAN slab-use-after-free trace. The bundle marks KEV as false and provides no cited evidence of active exploitation, public exploit use, or weaponized attack paths.

Researcher notes

The available evidence supports a race-triggered memory-safety bug in fs/f2fs extent cache logic. Impact beyond kernel crash or instability is not established in the bundle. Do not assume remote exploitation, privilege escalation, or affected distro package ranges without vendor confirmation.

Mitigation direction

  • Apply Linux stable updates containing the referenced F2FS fixes.
  • Use your distribution's kernel advisory to identify the corrected package version.
  • Prioritize systems that mount F2FS filesystems or handle untrusted removable storage.
  • If no package fix is available, follow vendor kernel guidance before changing filesystem usage.

Validation and detection

  • Inventory Linux hosts and identify kernels with F2FS enabled or mounted.
  • Compare running kernel versions against vendor advisories and the referenced stable commits.
  • Check kernel changelogs for the F2FS extent cache locking fix.
  • Review crash logs for F2FS KASAN or use-after-free traces.
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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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
1ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

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.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux98e4da8ca301e062d79ae168c67e56f3c3de3ce4, 98e4da8ca301e062d79ae168c67e56f3c3de3ce4, 98e4da8ca301e062d79ae168c67e56f3c3de3ce4unaffected
LinuxLinux3.8, 0, 6.6.47, 6.10.6, 6.11affected
Weakness

CWE details

No CWE listed

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