CVE-2026-45998: rxrpc: Fix potential UAF after skb_unshare() failure

Affected versions

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

• linux linux kernel6.2 and later · before 6.6.140
• linux linux kernel6.7 and later · before 6.12.86
• linux linux kernel6.13 and later · before 6.18.27
• linux linux kernel6.19 and later · before 7.0.4

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

  • 6.2affected
  • 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 and later · before e3bf143b1e98fb3d6d9e6825bcd683974d478e8caffected · git
  • 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 and later · before bf20f46d94f1db38e6ffc0ca204a5fe0de01b495affected · git
  • 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 and later · before 996b0487b3cdda4c91811dbb1c9564626bc840bdaffected · git
  • 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 and later · before 8fde6296c4d4da2be7ab761305ab7f232b94eefdaffected · git
  • 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 and later · before 1f2740150f904bfa60e4bad74d65add3ccb5e7f8affected · git
  • before 6.2not affected · semver
  • 6.6.140 and later · up to and including 6.6.*not affected · semver
  • 6.12.86 and later · up to and including 6.12.*not affected · semver
  • 6.18.27 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-2026-45996May 27, 2026 · spi: imx: fix use-after-free on unbind
  31Monitor
• ← EarlierCVE-2026-45997May 27, 2026 · scsi: sd: fix missing put_disk() when device_add(&disk_dev) fails
  22Monitor
• Later →CVE-2026-46000May 27, 2026 · rxrpc: Fix conn-level packet handling to unshare RESPONSE packets
  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.