CVE-2025-39866: fs: writeback: fix use-after-free in __mark_inode_dirty()

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• debian debian linux11.0
• linux linux kernel5.11 and later · before 5.15.192
• linux linux kernel5.16 and later · before 6.1.151
• linux linux kernel6.2 and later · before 6.6.105
• linux linux kernel4.2 and later · before 5.10.247
• linux linux kernel6.13 and later · before 6.16.6
• linux linux kernel6.7 and later · before 6.12.46
• linux linux kernel6.17

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

• Linux Linux

  • 4.2affected
  • 0747259d13febfcc838980a63c414c9b920cea6f and later · before e2a14bbae5d8bacaa301362744a110e2be40a3a3affected · git
  • 0747259d13febfcc838980a63c414c9b920cea6f and later · before b187c976111960e6e54a6b1fff724f6e3d39406caffected · git
  • 0747259d13febfcc838980a63c414c9b920cea6f and later · before 1edc2feb9c759a9883dfe81cb5ed231412d8b2e4affected · git
  • 0747259d13febfcc838980a63c414c9b920cea6f and later · before bf89b1f87c72df79cf76203f71fbf8349cd5c9deaffected · git
  • 0747259d13febfcc838980a63c414c9b920cea6f and later · before e63052921f1b25a836feb1500b841bff7a4a0456affected · git
  • 0747259d13febfcc838980a63c414c9b920cea6f and later · before c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17aaffected · git
  • 0747259d13febfcc838980a63c414c9b920cea6f and later · before d02d2c98d25793902f65803ab853b592c7a96b29affected · git
  • before 4.2not affected · semver
  • 5.10.247 and later · up to and including 5.10.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
  90Now
• CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
  89Now
• CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
  85Now

Published before and after this one in the same product

• ← EarlierCVE-2025-39864Sep 19, 2025 · wifi: cfg80211: fix use-after-free in cmp_bss()
  31Monitor
• ← EarlierCVE-2025-39865Sep 19, 2025 · tee: fix NULL pointer dereference in tee_shm_put
  22Monitor
• Later →CVE-2025-39868Sep 23, 2025 · erofs: fix runtime warning on truncate_folio_batch_exceptionals()
  31Monitor

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1free(dev->buf);2/* ... another thread is still running ... */3process(dev->buf);

1lock(&dev->lock);2free(dev->buf);3dev->buf = NULL;4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.