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CVE Record

CVE-2024-27070: f2fs: fix to avoid use-after-free issue in f2fs_filemap_fault

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid use-after-free issue in f2fs_filemap_fault syzbot reports a f2fs bug as below: BUG: KASAN: slab-use-after-free in f2fs_filemap_fault+0xd1/0x2c0 fs/f2fs/file.c:49 Read of size 8 at addr ffff88807bb22680 by task syz-executor184/5058 CPU: 0 PID: 5058 Comm: syz-executor184 Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x163/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x170 mm/kasan/report.c:601 f2fs_filemap_fault+0xd1/0x2c0 fs/f2fs/file.c:49 __do_fault+0x131/0x450 mm/memory.c:4376 do_shared_fault mm/memory.c:4798 [inline] do_fault mm/memory.c:4872 [inline] do_pte_missing mm/memory.c:3745 [inline] handle_pte_fault mm/memory.c:5144 [inline] __handle_mm_fault+0x23b7/0x72b0 mm/memory.c:5285 handle_mm_fault+0x27e/0x770 mm/memory.c:5450 do_user_addr_fault arch/x86/mm/fault.c:1364 [inline] handle_page_fault arch/x86/mm/fault.c:1507 [inline] exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1563 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 The root cause is: in f2fs_filemap_fault(), vmf->vma may be not alive after filemap_fault(), so it may cause use-after-free issue when accessing vmf->vma->vm_flags in trace_f2fs_filemap_fault(). So it needs to keep vm_flags in separated temporary variable for tracepoint use.

HighCVSS 7.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux kernel flaw in the F2FS filesystem can access memory after it has been freed during a file-backed page fault. A local, low-privileged user may be able to expose sensitive memory or crash an affected system. The supplied CVSS score is 7.1, high severity.

Executive priority

Prioritize normal high-severity patching, escalating systems that combine F2FS with untrusted local users. Internet-only exposure is not indicated. There is no supplied evidence of active exploitation, but confidentiality and availability impacts justify timely remediation.

Technical view

In f2fs_filemap_fault(), filemap_fault() may invalidate vmf->vma before trace_f2fs_filemap_fault() reads vmf->vma->vm_flags, causing a slab use-after-free. The stable fixes preserve vm_flags in a temporary variable before the potentially invalidating call. The issue was reproduced by syzbot with KASAN.

Likely exposure

Exposure requires an affected Linux kernel, use of F2FS, and local low-privileged access. Systems without F2FS usage are unlikely to reach this code path. The bundle lists affected 6.8-series kernel versions, but distribution-specific backports require vendor confirmation.

Exploitation context

The CVSS vector indicates local access, low complexity, low privileges, no user interaction, and potential high confidentiality and availability impact. The source bundle marks this CVE as absent from KEV and provides no evidence of active exploitation or a public exploit.

Researcher notes

The fault occurs after filemap_fault() may make vmf->vma unsafe to dereference. The fix snapshots vm_flags for later tracepoint use. The bundle provides no CWE, exploit evidence, or detailed distribution package mapping; affected status should therefore be verified against vendor advisories and backport records.

Mitigation direction

  • Install a vendor-supported kernel containing the referenced stable fix.
  • Prioritize multi-user systems where untrusted local users can access F2FS-backed files.
  • Consult distribution advisories to identify backported fixes and corrected package versions.
  • If immediate updating is impossible, reduce untrusted local access to systems using F2FS.

Validation and detection

  • Inventory running kernel versions and identify systems mounting or otherwise using F2FS.
  • Check vendor package changelogs for CVE-2024-27070 or the referenced stable commits.
  • After updating and rebooting, confirm the corrected kernel is running.
  • Review kernel crash and KASAN reports for f2fs_filemap_fault use-after-free signatures.
Prepared
Confidence
high
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-2024-27070 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

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.

1CVSS vectors
3Timeline events
2ADP providers
4Source links

SSVC decision data

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

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.1CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H1.85.2Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.1High
CVSS 3.1 vector shape for CVE-2024-27070Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxb43c3050d21196e5e7024872e3048dba83e31751, 87f3afd366f7c668be0269efda8a89741a3ea6b3, 87f3afd366f7c668be0269efda8a89741a3ea6b3unaffected
LinuxLinux6.8, 0, 6.8.2, 6.9affected
Weakness

CWE details

No CWE listed

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