CVE-2026-46113— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于KVM x86影子分页因意外的GFN导致释放后重用。
可能的 ATT&CK 技术 1 AI
T1059 · Command and Scripting Interpreter影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 6aa8b732ca01c3d7a54e93f4d701b8aabbe60fb7< 9597963a8ca16259d194a1d9950d7bd22a10ab2f |
affected |
6aa8b732ca01c3d7a54e93f4d701b8aabbe60fb7< e9d4ea13aa2b6400bb10ec64b370ba3dadcd22f0 |
affected | ||
6aa8b732ca01c3d7a54e93f4d701b8aabbe60fb7< 488e386484ec8c0e558be6e156edf34ed9f4d5c8 |
affected | ||
6aa8b732ca01c3d7a54e93f4d701b8aabbe60fb7< 06c19c967b845b63172601fe459667d973b7e6b7 |
affected | ||
6aa8b732ca01c3d7a54e93f4d701b8aabbe60fb7< 738ec97b1855df6c08fe2369f798fa0b972e556b |
affected | ||
6aa8b732ca01c3d7a54e93f4d701b8aabbe60fb7< 14d1e55dfd2cf4711bff164a6aaaddb783552134 |
affected | ||
6aa8b732ca01c3d7a54e93f4d701b8aabbe60fb7< 0cb2af2ea66ad8ff195c156ea690f11216285bdf |
affected | ||
2.6.20 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2026-46113 基础信息
漏洞信息
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Vulnerability Title
KVM: x86: Fix shadow paging use-after-free due to unexpected GFN
来源: 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 GFN
The shadow MMU computes GFNs for direct shadow pages using sp->gfn plus
the SPTE index. This assumption breaks for shadow paging if the guest
page tables are modified between VM entries (similar to commit
aad885e77496, "KVM: x86/mmu: Drop/zap existing present SPTE even
when creating an MMIO SPTE", 2026-03-27). The flow is as follows:
- a PDE is installed for a 2MB mapping, and a page in that area is
accessed. KVM creates a kvm_mmu_page consisting of 512 4KB pages;
the kvm_mmu_page is marked by FNAME(fetch) as direct-mapped because
the guest's mapping is a huge page (and thus contiguous).
- the PDE mapping is changed from outside the guest.
- the guest accesses another page in the same 2MB area. KVM installs
a new leaf SPTE and rmap entry; the SPTE uses the "correct" GFN
(i.e. based on the new mapping, as changed in the previous step) but
that GFN is outside of the [sp->gfn, sp->gfn + 511] range; therefore
the rmap entry cannot be found and removed when the kvm_mmu_page
is zapped.
- the memslot that covers the first 2MB mapping is deleted, and the
kvm_mmu_page for the now-invalid GPA is zapped. However, rmap_remove()
only looks at the [sp->gfn, sp->gfn + 511] range established in step 1,
and fails to find the rmap entry that was recorded by step 3.
- any operation that causes an rmap walk for the same page accessed
by step 3 then walks a stale rmap and dereferences a freed kvm_mmu_page.
This includes dirty logging or MMU notifier invalidations (e.g., from
MADV_DONTNEED).
The underlying issue is that KVM's walking of shadow PTEs assumes that
if a SPTE is present when KVM wants to install a non-leaf SPTE, then the
existing kvm_mmu_page must be for the correct gfn. Because the only way
for the gfn to be wrong is if KVM messed up and failed to zap a SPTE...
which shouldn't happen, but *actually* only happens in response to a
guest write.
That bug dates back literally forever, as even the first version of KVM
assumes that the GFN matches and walks into the "wrong" shadow page.
However, that was only an imprecision until 2032a93d66fa ("KVM: MMU:
Don't allocate gfns page for direct mmu pages") came along.
Fix it by checking for a target gfn mismatch and zapping the existing
SPTE. That way the old SP and rmap entries are gone, KVM installs
the rmap in the right location, and everyone is happy.
来源: 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
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于KVM x86影子分页因意外的GFN导致释放后重用。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-46113 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-46113 补丁与修复 (7)
同批安全公告 · Linux · 2026-05-28 · 共 135 条
| CVE-2026-46135 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46195 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46137 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46115 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46155 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46119 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46185 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46212 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46174 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46125 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46198 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46166 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46152 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46238 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46138 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46232 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46215 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46157 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46210 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46227 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 135 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-46113
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