CVE-2024-35869: smb: client: guarantee refcounted children from parent session

Affected versions

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

• linux linux kernel6.2.8 and later · before 6.3
• linux linux kernel6.4 and later · before 6.6.29
• linux linux kernel6.7 and later · before 6.8.5
• linux linux kernel6.9

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

  • f30d226bcc9f0e2d97b4a6e94c43a28148fbeab6, c082c3be0f96e759ff2e361d929832fda0b93851, 6.4affected
  • 8e3554150d6c80a84b3cb046615d1a0e943811dc and later · before 645f332c6b63499cc76197f9b6bffcc659ba64ccaffected · git
  • 8e3554150d6c80a84b3cb046615d1a0e943811dc and later · before e1db9ae87b7148c021daee1fcc4bc71b2ac58a79affected · git
  • 8e3554150d6c80a84b3cb046615d1a0e943811dc and later · before 062a7f0ff46eb57aff526897bd2bebfdb1d3046aaffected · git
  • 6.2.15 and later · before 6.3affected · semver
  • 6.3.2 and later · before 6.4affected · semver
  • before 6.4not affected · semver
  • 6.6.29 and later · up to and including 6.6.*not affected · semver
  • 6.8.5 and later · up to and including 6.8.*not affected · semver
  • 6.9 and laternot affected · original_commit_for_fix

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-2024-35867May 19, 2024 · smb: client: fix potential UAF in cifs_stats_proc_show()
  31Monitor
• ← EarlierCVE-2024-35868May 19, 2024 · smb: client: fix potential UAF in cifs_stats_proc_write()
  31Monitor
• Later →CVE-2024-35870May 19, 2024 · smb: client: fix UAF in smb2_reconnect_server()
  39Monitor

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.