CVE-2023-3863: Use-after-free in nfc_llcp_find_loca in net/nfc/llcp_core.c

Affected versions

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

• debian debian linux10.0
• debian debian linux11.0
• debian debian linux12.0
• linux linux kernelbefore 6.5

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

• Fedora Fedora

  • all versionsunknown

• n/a Kernel

  • 6.5-rc1not affected

• Red Hat Red Hat Enterprise Linux 6

  • all versionsunknown

• Red Hat Red Hat Enterprise Linux 7

  • all versionsunknown
  • all versionsunknown

• Red Hat Red Hat Enterprise Linux 8

  • all versionsunknown
  • all versionsunknown

• Red Hat Red Hat Enterprise Linux 9

  • all versionsunknown
  • all versionsunknown

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-2023-3611Jul 21, 2023 · Out-of-bounds write in Linux kernel's net/sched: sch_qfq component
  31Monitor
• ← EarlierCVE-2023-2430Jul 22, 2023 · A vulnerability was found due to missing lock for IOPOLL flaw in io_cqring_event_overflow() in io_uring.c in Linux Kernel.
  22Monitor
• Later →CVE-2023-2860Jul 24, 2023 · Out-of-bounds read when setting hmac data
  17Monitor

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.