CVE-2026-23074: net/sched: Enforce that teql can only be used as root qdisc

Affected versions

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

• linux linux kernel2.6.12.1 and later · before 5.10.249
• linux linux kernel5.11 and later · before 5.15.199
• linux linux kernel5.16 and later · before 6.1.162
• linux linux kernel6.2 and later · before 6.6.122
• linux linux kernel6.7 and later · before 6.12.68
• linux linux kernel6.13 and later · before 6.18.8
• linux linux kernel2.6.12
• linux linux kernel6.19

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

  • 2.6.12affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 73d970ff0eddd874a84c953387c7f4464b705fc6affected · git
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before ae810e6a8ac4fe25042e6825d2a401207a2e41fbaffected · git
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before dad49a67c2d817bfec98e6e45121b351e3a0202caffected · git
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 0686bedfed34155520f3f735cbf3210cb9044380affected · git
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 4c7e8aa71c9232cba84c289b4b56cba80b280841affected · git
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 16ed73c1282d376b956bff23e5139add061767baaffected · git
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 50da4b9d07a7a463e2cfb738f3ad4cff6b2c9c3baffected · git
  • before 2.6.12not affected · semver
  • 5.10.249 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-2026-23071Feb 4, 2026 · regmap: Fix race condition in hwspinlock irqsave routine
  18Monitor
• ← EarlierCVE-2026-23073Feb 4, 2026 · wifi: rsi: Fix memory corruption due to not set vif driver data size
  31Monitor
• Later →CVE-2026-23076Feb 4, 2026 · ALSA: ctxfi: Fix potential OOB access in audio mixer handling
  28Monitor

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.