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CVE-2026-53359— KVM: x86: Fix shadow paging use-after-free due to unexpected role

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 2.6.36版本存在安全漏洞，该漏洞源于KVM x86影子分页中未预期角色导致的释放后重用问题，可能导致在释放页面后仍引用rmap条目，从而引发释放后重用。

CVSS 8.8 · High EPSS 0.17% · P6

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 2032a93d66fa282ba0f2ea9152eeff9511fa9a96< 0b5e8ead71e683bcf6232db16234cf7e6d553a23 affected
2032a93d66fa282ba0f2ea9152eeff9511fa9a96< b1337aae5e194324e4810d561764e7793f8b3864 affected
2032a93d66fa282ba0f2ea9152eeff9511fa9a96< 9291654d69e08542de37755cebe4d5b02c3170d1 affected
2032a93d66fa282ba0f2ea9152eeff9511fa9a96< 2ad3afa40ac6aa340dada122f9abfa46c0a6eb35 affected
2032a93d66fa282ba0f2ea9152eeff9511fa9a96< 5e470998a23e4c3d89ed24e8172cb22747e61efa affected
2032a93d66fa282ba0f2ea9152eeff9511fa9a96< 1ae7d5a6db6c190ce183e3098ca0e0846e14d462 affected
2032a93d66fa282ba0f2ea9152eeff9511fa9a96< 81ccda30b4e83d8f5cc4fd50503c44e3a33abfeb affected
2.6.36 affected
… +8 more rows
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I. Basic Information for CVE-2026-53359

Vulnerability Information
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Vulnerability Title
KVM: x86: Fix shadow paging use-after-free due to unexpected role
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 2.6.36版本存在安全漏洞，该漏洞源于KVM x86影子分页中未预期角色导致的释放后重用问题，可能导致在释放页面后仍引用rmap条目，从而引发释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 ~ 0b5e8ead71e683bcf6232db16234cf7e6d553a23 -
Linux Linux 2.6.36 -

II. Public POCs for CVE-2026-53359

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III. Intelligence Information for CVE-2026-53359

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Patches & Fixes for CVE-2026-53359 (7)

Same Patch Batch · Linux · 2026-07-04 · 4 CVEs total

CVE-2026-53360 8.8 HIGH KVM: SEV: Require in-GHCB scratch area if GHCB v2+ is in use
CVE-2026-53362 7.8 HIGH ipv6: account for fraggap on the paged allocation path
CVE-2026-53361 7.1 HIGH af_unix: Set gc_in_progress to true in unix_gc().

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53359

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