CVE-2026-64439: crypto: krb5 - filter out async aead implementations at alloc

Affected versions

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

• linux linux kernel6.15 and later · before 6.18.39
• linux linux kernel6.19 and later · before 7.1.4

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

  • 6.15affected
  • 00244da40f7821b242c4612428d4192230dba27f and later · before ef6feb77e2d91761427c5b773edc9c97e1b706adaffected · git
  • 00244da40f7821b242c4612428d4192230dba27f and later · before 2b7bd6dccff14b8b632c5244f1fd506918077221affected · git
  • 00244da40f7821b242c4612428d4192230dba27f and later · before 6c9dddeb582fde005360f4fe02c760d45ca05fb5affected · git
  • before 6.15not affected · semver
  • 6.18.39 and later · up to and including 6.18.*not affected · semver
  • 7.1.4 and later · up to and including 7.1.*not affected · semver
  • 7.2 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-2026-64436Jul 25, 2026 · net: af_key: initialize alg_key_len for IPComp states
  28Monitor
• ← EarlierCVE-2026-64438Jul 25, 2026 · crypto: qat - fix VF2PF work teardown race in adf_disable_sriov()
  35Monitor
• Later →CVE-2026-64440Jul 25, 2026 · staging: rtl8723bs: fix OOB write in HT_caps_handler()
  32Monitor

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.