CVE-2024-56675: bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors

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

  • 6.0affected
  • 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 and later · before 9245459a992d22fe0e92e988f49db1fec82c184aaffected · git
  • 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 and later · before f9f85df30118f3f4112761e6682fc60ebcce23e5affected · git
  • 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 and later · before 9b53d2c2a38a1effc341d99be3f99fa7ef17047daffected · git
  • 8c7dcb84e3b744b2b70baa7a44a9b1881c33a9c9 and later · before ef1b808e3b7c98612feceedf985c2fbbeb28f956affected · git
  • before 6.0not affected · semver
  • 6.1.121 and later · up to and including 6.1.*not affected · semver
  • 6.6.67 and later · up to and including 6.6.*not affected · semver
  • 6.12.6 and later · up to and including 6.12.*not affected · semver
  • 6.13 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-2024-56673Dec 27, 2024 · riscv: mm: Do not call pmd dtor on vmemmap page table teardown
  22Monitor
• ← EarlierCVE-2024-56674Dec 27, 2024 · virtio_net: correct netdev_tx_reset_queue() invocation point
  22Monitor
• Later →CVE-2024-53164Dec 27, 2024 · net: sched: fix ordering of qlen adjustment
  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.