f2fs: fix to trigger foreground gc during f2fs_map_blocks() in lfs mode

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-38626
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-08-22 16:15:36 UTC
Updated2026-06-01 17:16:35 UTC
DescriptionIn 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().

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 36abef4e796d382e81a0c2d21ea5327481dd7154 c737047f4665232d1e26b3620bc62df334545451 git Not specified
CNA Linux Linux affected 36abef4e796d382e81a0c2d21ea5327481dd7154 d2f280f43a2a9d918fd23169ff3a6f3b65c7cec5 git Not specified
CNA Linux Linux affected 36abef4e796d382e81a0c2d21ea5327481dd7154 f289690f50a01c3e085d87853392d5b7436a4cee git Not specified
CNA Linux Linux affected 36abef4e796d382e81a0c2d21ea5327481dd7154 82765ce5c7a56f9309ee45328e763610eaf11253 git Not specified
CNA Linux Linux affected 36abef4e796d382e81a0c2d21ea5327481dd7154 264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5 git Not specified
CNA Linux Linux affected 36abef4e796d382e81a0c2d21ea5327481dd7154 385e64a0744584397b4b52b27c96703516f39968 git Not specified
CNA Linux Linux affected 36abef4e796d382e81a0c2d21ea5327481dd7154 1005a3ca28e90c7a64fa43023f866b960a60f791 git Not specified
CNA Linux Linux affected 4.8 Not specified
CNA Linux Linux unaffected 4.8 semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.102 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.42 6.12.* semver Not specified
CNA Linux Linux unaffected 6.15.10 6.15.* semver Not specified
CNA Linux Linux unaffected 6.16.1 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d2f280f43a2a9d918fd23169ff3a6f3b65c7cec5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f289690f50a01c3e085d87853392d5b7436a4cee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c737047f4665232d1e26b3620bc62df334545451 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/385e64a0744584397b4b52b27c96703516f39968 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1005a3ca28e90c7a64fa43023f866b960a60f791 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/82765ce5c7a56f9309ee45328e763610eaf11253 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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