5.5

CVE-2025-38626: linux

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2025-38626DEBIAN-CVE-2025-38626
Published 22-08-2025Last modified 01-06-2026
Open JSON

Vulnerability summary

CVE-2025-38626 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.8% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.16%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 37 · Related 35
MGASA-2025-0234MGASA-2025-0235USN-7879-1USN-7879-2USN-7879-3USN-7879-4

Timeline

  1. 22-08-2025
    PublishedVulnerability first disclosed.
  2. 01-06-2026
    Last modifiedVulnerability information updated.

Description

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().

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

0.00 pp

From 0.16% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.16%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu148 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1046.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 36abef4e796d382e81a0c2d21ea5327481dd7154, < c737047f4665232d1e26b3620bc62df334545451 | ≥ 36abef4e796d382e81a0c2d21ea5327481dd7154, < d2f280f43a2a9d918fd23169ff3a6f3b65c7cec5 | ≥ 36abef4e796d382e81a0c2d21ea5327481dd7154, < f289690f50a01c3e085d87853392d5b7436a4cee | ≥ 36abef4e796d382e81a0c2d21ea5327481dd7154, < 82765ce5c7a56f9309ee45328e763610eaf11253 | ≥ 36abef4e796d382e81a0c2d21ea5327481dd7154, < 264ede8a52f18647ed5bb5f2bd9bf54f556ad8f5 | ≥ 36abef4e796d382e81a0c2d21ea5327481dd7154, < 385e64a0744584397b4b52b27c96703516f39968 | ≥ 36abef4e796d382e81a0c2d21ea5327481dd7154, < 1005a3ca28e90c7a64fa43023f866b960a60f791 | 4.8
  • linux_kernel≥ 4.8, < 6.6.102 | ≥ 6.7, < 6.12.42 | ≥ 6.13, < 6.15.10 | ≥ 6.16, < 6.16.1
Debian1 product
  • linux< 6.1.170-1 | < 6.12.43-1 | < 6.16.3-1

3 vendors · 151 products

References

47 links
Show all 47 references