--- id: CVE-2026-53359 title: |- In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix shadow paging use-after-free due to unexpected role Commit 0cb2af2ea66ad ("KVM: x86: Fix shadow paging use-after-free due to unexpected GFN") fixed a sha… summary: |- In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix shadow paging use-after-free due to unexpected role Commit 0cb2af2ea66ad ("KVM: x86: Fix shadow paging use-after-free due to unexpected GFN") fixed a sha… severity: high cvss: 8.8 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H' cwe: - CWE-416 - CWE-825 vendor: linux product: linux_kernel affected: - 'linux_kernel >= 2.6.36, < 6.1.177' - 'linux_kernel >= 6.2, < 6.6.144' - 'linux_kernel >= 6.7, < 6.12.95' - 'linux_kernel >= 6.13, < 6.18.38' - 'linux_kernel >= 6.19, < 7.1.3' patched: - linux_kernel 7.1.3 published: '2026-07-04' updated: '2026-10-03' sourceUpdated: '2026-10-03T11:17:35.393' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53359' references: - url: 'https://git.kernel.org/stable/c/0b5e8ead71e683bcf6232db16234cf7e6d553a23' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/1ae7d5a6db6c190ce183e3098ca0e0846e14d462' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/2ad3afa40ac6aa340dada122f9abfa46c0a6eb35' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/5e470998a23e4c3d89ed24e8172cb22747e61efa' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/81ccda30b4e83d8f5cc4fd50503c44e3a33abfeb' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/9291654d69e08542de37755cebe4d5b02c3170d1' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/b1337aae5e194324e4810d561764e7793f8b3864' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'http://www.openwall.com/lists/oss-security/2026/07/06/7' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://github.com/V4bel/Januscape/blob/main/assets/write-up.md' label: 134c704f-9b21-4f2e-91b3-4a467353bcc0 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53359.json - url: 'https://access.redhat.com/security/cve/CVE-2026-53359' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2497033' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-53359' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53359' - url: >- https://lore.kernel.org/linux-cve-announce/2026070403-CVE-2026-53359-4f57@gregkh/T - url: 'https://www.openwall.com/lists/oss-security/2026/07/06/7' - url: 'https://access.redhat.com/errata/RHSA-2026:54205' - url: 'https://access.redhat.com/errata/RHSA-2026:54187' - url: 'https://access.redhat.com/errata/RHSA-2026:43252' - url: 'https://access.redhat.com/errata/RHSA-2026:44230' - url: 'https://access.redhat.com/errata/RHSA-2026:44231' - url: 'https://access.redhat.com/errata/RHSA-2026:40787' - url: 'https://access.redhat.com/errata/RHSA-2026:40779' - url: 'https://access.redhat.com/errata/RHSA-2026:40764' - url: 'https://access.redhat.com/errata/RHSA-2026:39371' - url: 'https://access.redhat.com/errata/RHSA-2026:36956' - url: 'https://access.redhat.com/errata/RHSA-2026:40082' - url: 'https://access.redhat.com/errata/RHSA-2026:37729' - url: 'https://access.redhat.com/errata/RHSA-2026:38902' - url: 'https://access.redhat.com/errata/RHSA-2026:36957' - url: 'https://access.redhat.com/errata/RHSA-2026:43826' - url: 'https://access.redhat.com/errata/RHSA-2026:39083' - url: 'https://access.redhat.com/errata/RHSA-2026:44004' - url: 'https://access.redhat.com/errata/RHSA-2026:49033' - url: 'https://access.redhat.com/errata/RHSA-2026:41229' - url: 'https://access.redhat.com/errata/RHSA-2026:43847' - url: 'https://access.redhat.com/errata/RHSA-2026:44003' - url: 'https://access.redhat.com/errata/RHSA-2026:44006' - url: 'https://access.redhat.com/errata/RHSA-2026:44007' tags: - nvd - cve.org - exploit-available - csaf - vex - red-hat exploitAvailable: true ssvc: exploitation: poc automatable: 'no' technicalImpact: total timestamp: '2026-07-08T03:56:43.137575Z' epss: 0.01368 epssPercentile: 0.71715 exploits: github: 7 githubRepos: - 'https://github.com/Aoripus-LTD/Januscape-Hotfix' - 'https://github.com/0xBlackash/CVE-2026-53359' - 'https://github.com/chuzhongyun/CVE-2026-53359-Kernel-Fix' checkedAt: '2026-10-27T19:03:04.070Z' scores: nvd: 8.8 vendor: 7.8 ingestedAt: '2026-07-04T21:57:46.986Z' --- ## Overview In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix shadow paging use-after-free due to unexpected role Commit 0cb2af2ea66ad ("KVM: x86: Fix shadow paging use-after-free due to unexpected GFN") fixed a shadow paging mismatch between stored and computed GFNs; the bug could be triggered by changing a PDE mapping from outside the guest, and then deleting a memslot. The rmap_remove() call would miss entries created after the PDE change because the GFN of the leaf SPTE does not match the GFN of the struct kvm_mmu_page. A similar hole however remains if the modified PDE points to a non-leaf page. In this case the gfn can be made to match, but the role does not match: the original large 2MB page creates a kvm_mmu_page with direct=1, while the new 4KB needs a kvm_mmu_page with direct=0. However, kvm_mmu_get_child_sp() does not compare the role, and therefore reuses the page. The next step is installing a leaf (4KB) SPTE on the new path which records an rmap entry under the gfn resolved by the walk. But when that child is zapped its parent kvm_mmu_page has direct=1 and kvm_mmu_page_get_gfn() computes the gfn for the 4KB page as sp->gfn + index instead of using sp->shadowed_translation[] (or sp->gfns[] in older kernels). It therefore fails to remove the recorded entry. When the memslot is dropped the shadow page is freed but the rmap entry survives, as in the scenario that was already fixed. Code that later walks that gfn (dirty logging, MMU notifier invalidation, and so on) dereferences an sptep that lies in the freed page, causing the use-after-free. ## Affected - `linux_kernel >= 2.6.36, < 6.1.177` - `linux_kernel >= 6.2, < 6.6.144` - `linux_kernel >= 6.7, < 6.12.95` - `linux_kernel >= 6.13, < 6.18.38` - `linux_kernel >= 6.19, < 7.1.3` ## Remediation Upgrade past the affected range: - `linux_kernel 7.1.3` ## Vendor advisories - **RHSA-2026:54205** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.12 · released 2026-08-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:54205) - **RHSA-2026:54187** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.13 · released 2026-08-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:54187) - **RHSA-2026:43252** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.14 · released 2026-07-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:43252) - **RHSA-2026:44230** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.18 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:44230) - **RHSA-2026:44231** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.19 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:44231) - **RHSA-2026:40787** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.20 · released 2026-07-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:40787) - **RHSA-2026:40779** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.21 · released 2026-07-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:40779) - **RHSA-2026:40764** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-07-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:40764) - **RHSA-2026:39371** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0) · released 2026-07-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:39371) - **RHSA-2026:36956** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-07-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:36956) - **RHSA-2026:40082** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2) · released 2026-07-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:40082) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 7 · updated 2026-10-13 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53359.json)