CVE-2026-31493: RDMA/efa: Fix use of completion ctx after free

Affected versions

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

• linux linux kernel5.12.1 and later · before 6.18.21
• linux linux kernel6.19 and later · before 6.19.11
• linux linux kernel5.12
• linux linux kernel7.0

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

  • 5.12affected
  • 68fb9f3e312a36e49fd05ec2d6b668daf2c4931a and later · before 8c24b5179af260a5f36571c992d29aab1f448544affected · git
  • 68fb9f3e312a36e49fd05ec2d6b668daf2c4931a and later · before 7ba09d85f177e9f5f64b881f33dbcb57b2cf23d5affected · git
  • 68fb9f3e312a36e49fd05ec2d6b668daf2c4931a and later · before 0dd98aea1c0c45987fa2dd92f988b0eb1a72c125affected · git
  • 68fb9f3e312a36e49fd05ec2d6b668daf2c4931a and later · before 1cf95fe5dc5471efea947b4c6f8913da6bc7976eaffected · git
  • 68fb9f3e312a36e49fd05ec2d6b668daf2c4931a and later · before ef3b06742c8a201d0e83edc9a33a89a4fe3009f8affected · git
  • before 5.12not affected · semver
  • 6.6.160 and later · up to and including 6.6.*not affected · semver
  • 6.12.114 and later · up to and including 6.12.*not affected · semver
  • 6.18.21 and later · up to and including 6.18.*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-2026-31487Apr 22, 2026 · spi: use generic driver_override infrastructure
  22Monitor
• ← EarlierCVE-2026-31488Apr 22, 2026 · drm/amd/display: Do not skip unrelated mode changes in DSC validation
  31Monitor
• Later →CVE-2026-31494Apr 22, 2026 · net: macb: use the current queue number for stats
  31Monitor

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.