8.8 CVE-2026-64561

Enriched by CISA Exploit
 

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Check for invalid/obsolete root *after* making MMU pages available Check for a "stale" page fault, i.e. for an invalid and/or obsolete root, after making MMU pages available for the shadow MMU. If reclaiming shadow pages zaps an in-use root, i.e. marks it invalid, then KVM will attempt to map memory into an invalid root. On its own, populating an invalid root is "fine", but because child shadow pages inherit their parent's role, any children created during the map/fetch will be created as invalid pages, thus violating KVM's invariant that invalid pages are never on the list of active MMU pages. Note, the underlying flaw has existed since KVM first started tracking invalid roots in 2008 (commit 2e53d63acba7, "KVM: MMU: ignore zapped root pagetables"), but the true badness only came along in 2020 (Linux 5.9) with the invariant that invalid shadow pages can't be on the list of active pages. Note #2, inheriting role.invalid when creating child shadow pages is also far from ideal; that flaw will be addressed separately.
https://nvd.nist.gov/vuln/detail/CVE-2026-64561

Categories

No category defined

References


 

AFFECTED (from MITRE)

Vendor Product Versions
Linux Linux
  • f95eec9bed76d42194c23153cb1cc8f186bf91cb < 65c4f7a1028cf01a93a2762d679c289810ede990 [affected]
  • f95eec9bed76d42194c23153cb1cc8f186bf91cb < 35e77467610c4a37cb0ff54ee56b85f73b1f5700 [affected]
  • f95eec9bed76d42194c23153cb1cc8f186bf91cb < 0026dbb7de8ea76e97d6edf42fc3cc084564e2bf [affected]
  • f95eec9bed76d42194c23153cb1cc8f186bf91cb < f3477a6a4164f15287444eda685b5f6405dbd1e5 [affected]
  • f95eec9bed76d42194c23153cb1cc8f186bf91cb < bce0d3c26e2c761a4bf43c8949f333fc7374eb2d [affected]
  • f95eec9bed76d42194c23153cb1cc8f186bf91cb < 2abd5287f08319fa35764566b15c6e22cb1068db [affected]
Linux Linux
  • 5.9 [affected]
  • < 5.9 [unaffected]
  • 6.1.183 ≤ 6.1.* [unaffected]
  • 6.6.148 ≤ 6.6.* [unaffected]
  • 6.12.101 ≤ 6.12.* [unaffected]
  • 6.18.42 ≤ 6.18.* [unaffected]
  • 7.1.6 ≤ 7.1.* [unaffected]
  • 7.2 ≤ * [unaffected]
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

CPE

cpe start end
Configuration 1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.9 < 6.1.183
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.9 < 6.6.148
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.9 < 6.12.101
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.9 < 6.18.42
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.9 < 7.1.6
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.9 < 7.2

REMEDIATION


EXPLOITS

Exploit-db.com

id description date
No known exploits

POC Github

Url
https://github.com/HackSpeak/CVE-2026-64561

Other Nist (github, ...)

Url
No known exploits

CAPEC

Common Attack Pattern Enumerations and Classifications

id description severity
No entry