Linux Kernel up to 6.6.101/6.12.41/6.15.9/6.16.0 f2fs f2fs_map_blocks allocation of resources

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4.9$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.6.101/6.12.41/6.15.9/6.16.0. This issue affects the function f2fs_map_blocks of the component f2fs. Such manipulation leads to allocation of resources. This vulnerability is documented as CVE-2025-38626. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.101/6.12.41/6.15.9/6.16.0 and classified as critical. Affected by this issue is the function f2fs_map_blocks of the component f2fs. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode w/ "mode=lfs" mount option, generic/299 will cause system panic as below: ------------[ cut here ]------------ kernel BUG at fs/f2fs/segment.c:2835! Call Trace: <TASK> f2fs_allocate_data_block+0x6f4/0xc50 f2fs_map_blocks+0x970/0x1550 f2fs_iomap_begin+0xb2/0x1e0 iomap_iter+0x1d6/0x430 __iomap_dio_rw+0x208/0x9a0 f2fs_file_write_iter+0x6b3/0xfa0 aio_write+0x15d/0x2e0 io_submit_one+0x55e/0xab0 __x64_sys_io_submit+0xa5/0x230 do_syscall_64+0x84/0x2f0 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0010:new_curseg+0x70f/0x720 The root cause of we run out-of-space is: in f2fs_map_blocks(), f2fs may trigger foreground gc only if it allocates any physical block, it will be a little bit later when there is multiple threads writing data w/ aio/dio/bufio method in parallel, since we always use OPU in lfs mode, so f2fs_map_blocks() does block allocations aggressively. In order to fix this issue, let's give a chance to trigger foreground gc in prior to block allocation in f2fs_map_blocks().

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2025-38626 since 04/16/2025. The exploitation is known to be difficult. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 260275 (Linux Distros Unpatched Vulnerability : CVE-2025-38626), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.102, 6.12.42, 6.15.10, 6.16.1 or 6.17-rc1 eliminates this vulnerability. Applying the patch f289690f50a01c3e085d87853392d5b7436a4cee/82765ce5c7a56f9309ee45328e763610eaf11253/264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5/385e64a0744584397b4b52b27c96703516f39968/1005a3ca28e90c7a64fa43023f866b960a60f791 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (260275) and CERT Bund (WID-SEC-2025-1898). Once again VulDB remains the best source for vulnerability data.

Affected

  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • NetApp AFF
  • NetApp ActiveIQ Unified Manager
  • SUSE openSUSE
  • Dell Avamar
  • NetApp FAS
  • Open Source Linux Kernel
  • Dell NetWorker
  • Dell Secure Connect Gateway
  • Dell ECS

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.9

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 260275
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-38626

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.102/6.12.42/6.15.10/6.16.1/6.17-rc1
Patch: f289690f50a01c3e085d87853392d5b7436a4cee/82765ce5c7a56f9309ee45328e763610eaf11253/264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5/385e64a0744584397b4b52b27c96703516f39968/1005a3ca28e90c7a64fa43023f866b960a60f791

Timelineinfo

04/16/2025 CVE reserved
08/22/2025 +128 days Advisory disclosed
08/22/2025 +0 days VulDB entry created
05/28/2026 +279 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-38626 (🔒)
GCVE (CVE): GCVE-0-2025-38626
GCVE (VulDB): GCVE-100-321116
CERT Bund: WID-SEC-2025-1898 - Linux Kernel: Mehrere Schwachstellen erm&ouml;glichen Denial of Service und Privilegieneskalation

Entryinfo

Created: 08/22/2025 23:38
Updated: 05/28/2026 16:57
Changes: 08/22/2025 23:38 (59), 09/02/2025 11:43 (2), 09/22/2025 00:40 (7), 09/23/2025 16:01 (1), 10/17/2025 21:47 (1), 10/26/2025 08:31 (1), 11/10/2025 13:50 (1), 11/26/2025 20:55 (13), 02/13/2026 19:54 (1), 05/28/2026 16:57 (3)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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