5.5
MEDIUM
CVE-2021-47335
Linux F2FS Use-after-Free Vulnerability
Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances As syzbot reported, there is an use-after-free issue during f2fs recovery: Use-after-free write at 0xffff88823bc16040 (in kfence-#10): kmem_cache_destroy+0x1f/0x120 mm/slab_common.c:486 f2fs_recover_fsync_data+0x75b0/0x8380 fs/f2fs/recovery.c:869 f2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945 mount_bdev+0x26c/0x3a0 fs/super.c:1367 legacy_get_tree+0xea/0x180 fs/fs_context.c:592 vfs_get_tree+0x86/0x270 fs/super.c:1497 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x196f/0x2be0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae The root cause is multi f2fs filesystem instances can race on accessing global fsync_entry_slab pointer, result in use-after-free issue of slab cache, fixes to init/destroy this slab cache only once during module init/destroy procedure to avoid this issue.

INFO

Published Date :

May 21, 2024, 3:15 p.m.

Last Modified :

May 12, 2025, 7:58 p.m.

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Remotely Exploitable :

No

Impact Score :

3.6

Exploitability Score :

1.8
Affected Products

The following products are affected by CVE-2021-47335 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-47335.

URL Resource
https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409 Patch
https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048 Patch
https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347 Patch
https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a Patch
https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409 Patch
https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048 Patch
https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347 Patch
https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a Patch

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-47335 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-47335 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    May. 12, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    Added CWE CWE-416
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.12.18 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.13 up to (excluding) 5.13.3 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.10.51
    Added Reference Type CVE: https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409 Types: Patch
    Added Reference Type CVE: https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048 Types: Patch
    Added Reference Type CVE: https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347 Types: Patch
    Added Reference Type CVE: https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a Types: Patch
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409
    Added Reference https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048
    Added Reference https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347
    Added Reference https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 28, 2024

    Action Type Old Value New Value
  • CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 21, 2024

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances As syzbot reported, there is an use-after-free issue during f2fs recovery: Use-after-free write at 0xffff88823bc16040 (in kfence-#10): kmem_cache_destroy+0x1f/0x120 mm/slab_common.c:486 f2fs_recover_fsync_data+0x75b0/0x8380 fs/f2fs/recovery.c:869 f2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945 mount_bdev+0x26c/0x3a0 fs/super.c:1367 legacy_get_tree+0xea/0x180 fs/fs_context.c:592 vfs_get_tree+0x86/0x270 fs/super.c:1497 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x196f/0x2be0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae The root cause is multi f2fs filesystem instances can race on accessing global fsync_entry_slab pointer, result in use-after-free issue of slab cache, fixes to init/destroy this slab cache only once during module init/destroy procedure to avoid this issue.
    Added Reference kernel.org https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347 [No types assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-47335 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-47335 weaknesses.

CVSS31 - Vulnerability Scoring System
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Latest DB Update: May. 15, 2025 10:28