CVE-2025-21999: proc: fix UAF in proc_get_inode()

Affected versions

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

• linux linux kernel2.6.23 and later · before 6.1.132
• linux linux kernel6.2 and later · before 6.6.85
• linux linux kernel6.7 and later · before 6.12.21
• linux linux kernel6.13 and later · before 6.13.9
• linux linux kernel6.14

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

  • 5.6affected
  • 97a32539b9568bb653683349e5a76d02ff3c3e2c and later · before eda279586e571b05dff44d48e05f8977ad05855daffected · git
  • 97a32539b9568bb653683349e5a76d02ff3c3e2c and later · before 4b0b8445b6fd41e6f62ac90547a0ea9d348de3faaffected · git
  • 97a32539b9568bb653683349e5a76d02ff3c3e2c and later · before 966f331403dc3ed04ff64eaf3930cf1267965e53affected · git
  • 97a32539b9568bb653683349e5a76d02ff3c3e2c and later · before 63b53198aff2e4e6c5866a4ff73c7891f958ffa4affected · git
  • 97a32539b9568bb653683349e5a76d02ff3c3e2c and later · before ede3e8ac90ae106f0b29cd759aadebc1568f1308affected · git
  • 97a32539b9568bb653683349e5a76d02ff3c3e2c and later · before 64dc7c68e040251d9ec6e989acb69f8f6ae4a10baffected · git
  • 97a32539b9568bb653683349e5a76d02ff3c3e2c and later · before 654b33ada4ab5e926cd9c570196fefa7bec7c1dfaffected · git
  • before 5.6not affected · semver
  • 5.10.236 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-2025-22006Apr 3, 2025 · net: ethernet: ti: am65-cpsw: Fix NAPI registration sequence
  22Monitor
• ← EarlierCVE-2025-22007Apr 3, 2025 · Bluetooth: Fix error code in chan_alloc_skb_cb()
  22Monitor
• Later →CVE-2025-22005Apr 3, 2025 · ipv6: Fix memleak of nhc_pcpu_rth_output in fib_check_nh_v6_gw().
  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.