CVE-2023-53559: ip_vti: fix potential slab-use-after-free in decode_session6

Affected versions

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

• linux linux kernel3.19.1 and later · before 4.14.324
• linux linux kernel4.15 and later · before 4.19.293
• linux linux kernel4.20 and later · before 5.4.255
• linux linux kernel5.5 and later · before 5.10.192
• linux linux kernel5.11 and later · before 5.15.128
• linux linux kernel5.16 and later · before 6.1.47
• linux linux kernel6.2 and later · before 6.4.12
• linux linux kernel3.19
• linux linux kernel6.5

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

  • 3.19affected
  • f855691975bb06373a98711e4cfe2c224244b536 and later · before 82fb41c5de243e7dfa90f32ca58e35adaff56c1daffected · git
  • f855691975bb06373a98711e4cfe2c224244b536 and later · before 7dfe23659f3677c08a60a0056cda2d91a79c15caaffected · git
  • f855691975bb06373a98711e4cfe2c224244b536 and later · before d34c30442d5e53a33cde79ca163320dbe2432cbdaffected · git
  • f855691975bb06373a98711e4cfe2c224244b536 and later · before 0b4d69539fdea138af2befe08893850c89248068affected · git
  • f855691975bb06373a98711e4cfe2c224244b536 and later · before e1e04cc2ef2c0c0866c19f5627149a76c2baae32affected · git
  • f855691975bb06373a98711e4cfe2c224244b536 and later · before 2b05bf5dc437f7891dd409a3eaf5058459391c7aaffected · git
  • f855691975bb06373a98711e4cfe2c224244b536 and later · before 78e397a43e1c47321a4679cc49a6c4530bf820b9affected · git
  • f855691975bb06373a98711e4cfe2c224244b536 and later · before 6018a266279b1a75143c7c0804dd08a5fc4c3e0baffected · git
  • before 3.19not 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-2023-53556Oct 4, 2025 · iavf: Fix use-after-free in free_netdev
  31Monitor
• ← EarlierCVE-2023-53558Oct 4, 2025 · rcu-tasks: Avoid pr_info() with spin lock in cblist_init_generic()
  22Monitor
• Later →CVE-2023-53561Oct 4, 2025 · net: wwan: iosm: fix NULL pointer dereference when removing device
  22Monitor

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.