CVE-2026-53264: net/sched: act_api: use RCU with deferred freeing for action lifecycle

Affected versions

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

• linux linux kernel4.14 and later · before 5.10.259
• linux linux kernel5.11 and later · before 5.15.210
• linux linux kernel5.16 and later · before 6.1.176
• linux linux kernel6.2 and later · before 6.6.143
• linux linux kernel6.7 and later · before 6.12.94
• linux linux kernel6.13 and later · before 6.18.36
• linux linux kernel6.19 and later · before 7.0.13
• linux linux kernel7.1

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

  • 4.14affected
  • 7.1 and laternot affected · original_commit_for_fix
  • 6.6.143 and later · up to and including 6.6.*not affected · semver
  • 6.12.94 and later · up to and including 6.12.*not affected · semver
  • 6.18.36 and later · up to and including 6.18.*not affected · semver
  • 7.0.13 and later · up to and including 7.0.*not affected · semver
  • d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da and later · before 98b2e40879abf0245be5a5b7af69e0f6ff524ac3affected · git
  • d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da and later · before 18af5d2ef0c4f65787fd1280c8b23286b9f2a835affected · git
  • d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da and later · before 1f1b98fea6b9ea30507d0f2fbff6750292d097e2affected · git
  • d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da and later · before 8b136f18ac4b2ace5aaad3305b3f8a5d8165a009affected · git

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-2026-53262Jun 25, 2026 · l2tp: pppol2tp: hold reference to session in pppol2tp_ioctl()
  31Monitor
• ← EarlierCVE-2026-53263Jun 25, 2026 · 6lowpan: fix off-by-one in multicast context address compression
  22Monitor
• Later →CVE-2026-53265Jun 25, 2026 · dm cache policy smq: check allocation under invalidate lock
  31Monitor

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.