CVE-2026-64544

CVE CVE-2026-64544EUVD EUVD-2026-49595Published 2026-07-27T20:10:36.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 3.17; af316fc442ef23901bbfcec5af55e69ca6ce9563 <803591785d33cf13b6f73ce2796e8b9e6d5e6526; patch: 5.15.212; patch: 5.10.261; patch: 7.2-rc1; patch: 0; af316fc442ef23901bbfcec5af55e69ca6ce9563 <e162bc386e71b5412425a38ee048e8d2185491b9; af316fc442ef23901bbfcec5af55e69ca6ce9563 <89efd998470a93284b7ad5a20d4e0e3c6858ae8e; patch: 7.1.5; af316fc442ef23901bbfcec5af55e69ca6ce9563 <7016377699b5b25b7ec3c0bf2ec3f983c7e95f7c; patch: 6.18.40; patch: 6.6.145; af316fc442ef23901bbfcec5af55e69ca6ce9563 <b798ada5a5d1cb4cc4cfa72074b1b463eca6c506; af316fc442ef23901bbfcec5af55e69ca6ce9563 <627938383761fb4334b41ebe7ef438d6b8b19d60; patch: 6.12.97; af316fc442ef23901bbfcec5af55e69ca6ce9563 <6acd2fbd00f9c72aebefce63fc2e73e8f3d79061; patch: 6.1.178; af316fc442ef23901bbfcec5af55e69ca6ce9563 <f7dd32c5179d7755de18e21d5674b08f9e5cb180

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

Does this concern one of your customers?

This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.

Try it for 28 days

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.