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CVE-2026-64544· NVD / CVE Program· CNA Linux

crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents

In the Linux kernel, the following vulnerability has been resolved: crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents pefile_digest_pe_contents() computes the trailing-data hash length as pelen - (hashed_bytes + certs_size). A crafted PE can make the addition exceed pelen, causing the unsigned subtraction to underflow to ~4 GiB. This is passed to crypto_shash_update() which reads out of bounds and panics on unmapped vmalloc guard pages. BUG: unable to handle page fault for address: ffffc900038d8000 Oops: Oops: 0000 [#1] SMP KASAN NOPTI RIP: 0010:sha256_blocks_generic (lib/crypto/sha256.c:152) Call Trace: <TASK> __sha256_update (lib/crypto/sha256.c:208) crypto_sha256_update (crypto/sha256.c:142) verify_pefile_signature (crypto/asymmetric_keys/verify_pefile.c:436) kexec_kernel_verify_pe_sig (kernel/kexec_file.c:151) __do_sys_kexec_file_load (kernel/kexec_file.c:406) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) </TASK> Kernel panic - not syncing: Fatal exception Validate that the addition does not overflow and the result does not exceed pelen before the subtraction. Return -ELIBBAD on failure.

—No exploit Fix available

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Published
Jul 27, 2026
Updated
Aug 17, 2026
EPSS
0.2% · 11th percentile
CWE
—
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Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Affected systems

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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

    • 3.17affected
    • af316fc442ef23901bbfcec5af55e69ca6ce9563 and later · before 89efd998470a93284b7ad5a20d4e0e3c6858ae8eaffected · git
    • af316fc442ef23901bbfcec5af55e69ca6ce9563 and later · before 7016377699b5b25b7ec3c0bf2ec3f983c7e95f7caffected · git
    • af316fc442ef23901bbfcec5af55e69ca6ce9563 and later · before b798ada5a5d1cb4cc4cfa72074b1b463eca6c506affected · git
    • af316fc442ef23901bbfcec5af55e69ca6ce9563 and later · before 627938383761fb4334b41ebe7ef438d6b8b19d60affected · git
    • af316fc442ef23901bbfcec5af55e69ca6ce9563 and later · before e162bc386e71b5412425a38ee048e8d2185491b9affected · git
    • af316fc442ef23901bbfcec5af55e69ca6ce9563 and later · before 6acd2fbd00f9c72aebefce63fc2e73e8f3d79061affected · git
    • af316fc442ef23901bbfcec5af55e69ca6ce9563 and later · before 803591785d33cf13b6f73ce2796e8b9e6d5e6526affected · git
    • af316fc442ef23901bbfcec5af55e69ca6ce9563 and later · before f7dd32c5179d7755de18e21d5674b08f9e5cb180affected · git
    • before 3.17not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:12linux-6.12before 6.12.100-1~deb12u16.12.100-1~deb12u1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan
  • CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
    40Plan
  • CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
    40Plan
  • CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index
    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux627938383761fb4334b41ebe7ef438d6b8b19d60Vendor (CNA)
Linux Linux6acd2fbd00f9c72aebefce63fc2e73e8f3d79061Vendor (CNA)
Linux Linux7016377699b5b25b7ec3c0bf2ec3f983c7e95f7cVendor (CNA)
Linux Linux803591785d33cf13b6f73ce2796e8b9e6d5e6526Vendor (CNA)
Linux Linux89efd998470a93284b7ad5a20d4e0e3c6858ae8eVendor (CNA)
Linux Linuxb798ada5a5d1cb4cc4cfa72074b1b463eca6c506Vendor (CNA)
Linux Linuxe162bc386e71b5412425a38ee048e8d2185491b9Vendor (CNA)
Linux Linuxf7dd32c5179d7755de18e21d5674b08f9e5cb180Vendor (CNA)
azl3 kernel 6.6.144.1-1 on Azure Linux 3.06.6.145.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.100-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

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

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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.

Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records