CVE-2026-64544: linux

CVSS: UnknownReceived
AliasesUBUNTU-CVE-2026-64544DEBIAN-CVE-2026-64544
Published 27-07-2026Last modified 17-08-2026
Open JSON

Vulnerability summary

CVE-2026-64544 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.8% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 29 · Related 27
MGASA-2026-0336MGASA-2026-0337OPENSUSE-SU-2026:11476-1OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23477-1SUSE-SU-2026:23481-1

Timeline

  1. 27-07-2026
    PublishedVulnerability first disclosed.
  2. 17-08-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

0.00 pp

From 0.18% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-38.38
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1014.14
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.180-1 | < 6.12.100-1 | < 7.1.5-1
  • linux-6.12< 6.12.100-1~deb12u1
Linux1 product
  • linux≥ af316fc442ef23901bbfcec5af55e69ca6ce9563, < 89efd998470a93284b7ad5a20d4e0e3c6858ae8e | ≥ af316fc442ef23901bbfcec5af55e69ca6ce9563, < 7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c | ≥ af316fc442ef23901bbfcec5af55e69ca6ce9563, < b798ada5a5d1cb4cc4cfa72074b1b463eca6c506 | ≥ af316fc442ef23901bbfcec5af55e69ca6ce9563, < 627938383761fb4334b41ebe7ef438d6b8b19d60 | ≥ af316fc442ef23901bbfcec5af55e69ca6ce9563, < e162bc386e71b5412425a38ee048e8d2185491b9 | ≥ af316fc442ef23901bbfcec5af55e69ca6ce9563, < 6acd2fbd00f9c72aebefce63fc2e73e8f3d79061 | ≥ af316fc442ef23901bbfcec5af55e69ca6ce9563, < 803591785d33cf13b6f73ce2796e8b9e6d5e6526 | ≥ af316fc442ef23901bbfcec5af55e69ca6ce9563, < f7dd32c5179d7755de18e21d5674b08f9e5cb180 | 3.17

3 vendors · 172 products

References

27 links
Show all 27 references