crypto: asymmetric_keys - fix OOB read in pefile_digest_pe_contents
Summary
| CVE | CVE-2026-64544 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-27 21:17:06 UTC |
| Updated | 2026-07-27 21:17:06 UTC |
| 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. |
Risk And Classification
EPSS: 0.001760000 probability, percentile 0.074350000 (date 2026-07-29)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected af316fc442ef23901bbfcec5af55e69ca6ce9563 89efd998470a93284b7ad5a20d4e0e3c6858ae8e git | Not specified |
| CNA | Linux | Linux | affected af316fc442ef23901bbfcec5af55e69ca6ce9563 7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c git | Not specified |
| CNA | Linux | Linux | affected af316fc442ef23901bbfcec5af55e69ca6ce9563 b798ada5a5d1cb4cc4cfa72074b1b463eca6c506 git | Not specified |
| CNA | Linux | Linux | affected af316fc442ef23901bbfcec5af55e69ca6ce9563 627938383761fb4334b41ebe7ef438d6b8b19d60 git | Not specified |
| CNA | Linux | Linux | affected af316fc442ef23901bbfcec5af55e69ca6ce9563 e162bc386e71b5412425a38ee048e8d2185491b9 git | Not specified |
| CNA | Linux | Linux | affected af316fc442ef23901bbfcec5af55e69ca6ce9563 6acd2fbd00f9c72aebefce63fc2e73e8f3d79061 git | Not specified |
| CNA | Linux | Linux | affected af316fc442ef23901bbfcec5af55e69ca6ce9563 803591785d33cf13b6f73ce2796e8b9e6d5e6526 git | Not specified |
| CNA | Linux | Linux | affected af316fc442ef23901bbfcec5af55e69ca6ce9563 f7dd32c5179d7755de18e21d5674b08f9e5cb180 git | Not specified |
| CNA | Linux | Linux | affected 3.17 | Not specified |
| CNA | Linux | Linux | unaffected 3.17 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.261 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.212 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.178 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.145 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.97 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.40 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.5 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2-rc1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e162bc386e71b5412425a38ee048e8d2185491b9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/803591785d33cf13b6f73ce2796e8b9e6d5e6526 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/89efd998470a93284b7ad5a20d4e0e3c6858ae8e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6acd2fbd00f9c72aebefce63fc2e73e8f3d79061 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b798ada5a5d1cb4cc4cfa72074b1b463eca6c506 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f7dd32c5179d7755de18e21d5674b08f9e5cb180 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/627938383761fb4334b41ebe7ef438d6b8b19d60 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.