CVE-2026-63808: exfat: fix potential use-after-free in exfat_find_dir_entry()

Affected versions

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

• linux linux kernel5.7 and later · before 5.10.260
• linux linux kernel5.11 and later · before 5.15.211
• linux linux kernel5.16 and later · before 6.1.177
• linux linux kernel6.2 and later · before 6.6.144
• linux linux kernel6.7 and later · before 6.12.95
• linux linux kernel6.13 and later · before 6.18.38
• linux linux kernel6.19 and later · before 7.1.3

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

  • 5.7affected
  • ca06197382bde0a3bc20215595d1c9ce20c6e341 and later · before e6f1a11cfb808441a43ffae9b476cc135732cd27affected · git
  • ca06197382bde0a3bc20215595d1c9ce20c6e341 and later · before e48f413c2815787b8cade2795e194e3c4cd782efaffected · git
  • ca06197382bde0a3bc20215595d1c9ce20c6e341 and later · before 06c4e1e9967d332ac33ba38b7819851089ff9359affected · git
  • ca06197382bde0a3bc20215595d1c9ce20c6e341 and later · before 8e0abc17fbd7e305802e84fe98b4950d50f9c433affected · git
  • ca06197382bde0a3bc20215595d1c9ce20c6e341 and later · before 4d101016d5e587f820b3ae2d5bb6770d86342649affected · git
  • ca06197382bde0a3bc20215595d1c9ce20c6e341 and later · before adfacfbaeae2cb760f492357cc36b41f84ef7f86affected · git
  • ca06197382bde0a3bc20215595d1c9ce20c6e341 and later · before 708b97e792945d3e4653939fd3405d71a61ad065affected · git
  • ca06197382bde0a3bc20215595d1c9ce20c6e341 and later · before 3f5f8ee9917cc2b9076ac533492d8a200edcabb8affected · git
  • before 5.7not 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-2026-63806Jul 19, 2026 · KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned()
  28Monitor
• ← EarlierCVE-2026-63807Jul 19, 2026 · KVM: x86/mmu: Ensure hugepage is in by slot before checking max mapping level
  35Monitor
• Later →CVE-2026-63809Jul 19, 2026 · bpf: use kvfree() for replaced sysctl write buffer
  31Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.