CVE-2026-64544: Linux kernel · crypto: asymmetric_keys – fix OOB read in pefile_digest_pe_contents
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 3 Nov 2026, 18:31 UTC
Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 27 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.
What to do
AI-suggested
A fix has been implemented in the Linux kernel to validate the addition and prevent the underflow condition, returning an error on failure. Users should apply the official Linux kernel updates that include this fix once available. No other mitigation steps are indicated.
Description
A vulnerability in the Linux kernel's asymmetric_keys crypto subsystem allows an out-of-bounds (OOB) read due to an integer underflow in the pefile_digest_pe_contents function. This occurs when a crafted PE file causes an addition to exceed the length of the data, leading to an underflow and subsequent OOB read. The flaw can cause kernel panic due to accessing unmapped memory during cryptographic hash computation.
References
- git.kernel.org/stable/c/89efd998470a93284b7ad5a20d4e0e3c6858ae8e (opens in a new tab)
- git.kernel.org/stable/c/7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c (opens in a new tab)
- git.kernel.org/stable/c/b798ada5a5d1cb4cc4cfa72074b1b463eca6c506 (opens in a new tab)
- git.kernel.org/stable/c/627938383761fb4334b41ebe7ef438d6b8b19d60 (opens in a new tab)
- git.kernel.org/stable/c/e162bc386e71b5412425a38ee048e8d2185491b9 (opens in a new tab)
- git.kernel.org/stable/c/6acd2fbd00f9c72aebefce63fc2e73e8f3d79061 (opens in a new tab)
- git.kernel.org/stable/c/803591785d33cf13b6f73ce2796e8b9e6d5e6526 (opens in a new tab)
- git.kernel.org/stable/c/f7dd32c5179d7755de18e21d5674b08f9e5cb180 (opens in a new tab)