🛡️ CVE-2024-27070 — kernel

🟠 CVSS 7.1 — High ✅ No Known Exploit NVD
7.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability high.

Affected software

CVE-2024-27070 is recorded against 2 packages.

  • kernel (from 6.8.0 up to 6.8.2)
  • linux-kernel (from 6.8 up to 6.8.2)

Timeline and source

Published on 1 May 2024 and last revised on 6 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2024-27070 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.1
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2024-05-01
Updated 2026-08-12
Modified 2026-08-06

Affected Packages

Software From version Fixed in
kernel 6.8.0 6.8.2
linux-kernel 6.8 6.8.2

Similar Threats

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