net: tun: Fix use-after-free in tun_detach()

Affected versions

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

• linux linux kernel4.17 and later · before 4.19.268
• linux linux kernel4.20 and later · before 5.4.226
• linux linux kernel5.5 and later · before 5.10.158
• linux linux kernel5.11 and later · before 5.15.82
• linux linux kernel5.16 and later · before 6.0.12
• linux linux kernel6.1

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

  • 4.17affected
  • 83c1f36f9880814b24cdf6c2f91f66f61db65326 and later · before 1f23f1890d91812c35d32eab1b49621b6d32dc7baffected · git
  • 83c1f36f9880814b24cdf6c2f91f66f61db65326 and later · before 16c244bc65d1175775325ec0489a5a5c830e02c7affected · git
  • 83c1f36f9880814b24cdf6c2f91f66f61db65326 and later · before 5f442e1d403e0496bacb74a58e2be7f500695e6faffected · git
  • 83c1f36f9880814b24cdf6c2f91f66f61db65326 and later · before 04b995e963229501401810dab89dc73e7f12d054affected · git
  • 83c1f36f9880814b24cdf6c2f91f66f61db65326 and later · before 4cde8da2d814a3b7b176db81922d4ddaad7c0f0eaffected · git
  • 83c1f36f9880814b24cdf6c2f91f66f61db65326 and later · before 5daadc86f27ea4d691e2131c04310d0418c6cd12affected · git
  • before 4.17not affected · semver
  • 4.19.268 and later · up to and including 4.19.*not affected · semver
  • 5.4.226 and later · up to and including 5.4.*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-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
• CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
  83Now
• CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV
  77This week
• CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV
  77This week
• CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV
  77This week

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.