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CVE-2026-53360— 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基金会开源的一款操作系统内核。 Linux kernel 6.10版本存在安全漏洞，该漏洞源于GHCB scratch区域未正确使用，导致恶意SEV-SNP客户机能破坏主机内核堆内存并泄露主机堆布局信息。

CVSS 8.8 · High EPSS 0.24% · P14

影响版本矩阵 10

厂商产品 版本范围状态
Linux Linux 4af663c2f64a8d252e690c60cf8b8abf22dc2951< bf9ba093fbb83c0c9a3dedd50efec29424eca2fc affected
4af663c2f64a8d252e690c60cf8b8abf22dc2951< c9b4198fbc6ed99a9da4bee9f74bb730f926c9ae affected
4af663c2f64a8d252e690c60cf8b8abf22dc2951< b328ede59ac34e7998e1eee5e5f0cc26c2a91846 affected
4af663c2f64a8d252e690c60cf8b8abf22dc2951< db3f2195d29344a3cf1e9dd9ab7f21ced7308cf7 affected
6.10 affected
< 6.10 unaffected
6.12.93≤ 6.12.* unaffected
6.18.35≤ 6.18.* unaffected
… +2 条更多
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一、 漏洞 CVE-2026-53360 基础信息

漏洞信息
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Vulnerability Title
KVM: SEV: Require in-GHCB scratch area if GHCB v2+ is in use
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Require in-GHCB scratch area if GHCB v2+ is in use As per the GHCB spec, when using GHCB v2+ require the software scratch area to reside in the GHCB's shared buffer. Note, things like Page State Change (PSC) requests _rely_ on this behavior, as the guest can't provide a length when making the request, i.e. the size of the guest payload is bounded by the size of the shared buffer. Failure to force usage of the GHCB, and a slew of other flaws, lets a malicious SNP guest corrupt host kernel heap memory, and leak host heap layout information. setup_vmgexit_scratch() allocates a buffer via kvzalloc(exit_info_2), where exit_info_2 is guest-controlled. With exit_info_2=24, this yields a 24-byte allocation in kmalloc-cg-32 (32-byte slab objects). The buffer holds an 8-byte psc_hdr followed by 8-byte psc_entry structs, so only entries[0] and entries[1] are in-bounds. snp_begin_psc() validates end_entry against VMGEXIT_PSC_MAX_COUNT (253) but NOT against the actual buffer size: idx_end = hdr->end_entry; if (idx_end >= VMGEXIT_PSC_MAX_COUNT) { // checks 253, not buffer snp_complete_psc(svm, ...); return 1; } for (idx = idx_start; idx <= idx_end; idx++) { entry_start = entries[idx]; // OOB when idx >= 2 The guest sets end_entry=10+, causing the host to iterate entries[2+] which are OOB into adjacent slab objects. For each OOB entry: - The host reads 8 bytes (OOB READ / info leak oracle) - If the data passes PSC validation, __snp_complete_one_psc() writes cur_page = 1 or 512 into the entry (OOB WRITE, sev.c:3806) - If validation fails, the error response reveals whether adjacent memory is zero vs non-zero (information disclosure to guest) The guest controls allocation size (exit_info_2), entry range (cur_entry/end_entry), and can fire unlimited VMGEXITs to repeatedly hit different slab positions. By exploiting the variety of bugs, a malicious SEV-SNP guest can: - OOB read adjacent kmalloc-cg-32 objects (heap layout disclosure) - OOB write cur_page bits into adjacent objects (heap corruption) - Trigger use-after-free conditions across VMGEXITs E.g. with KASAN enabled, a single insmod of the PoC guest module produces 73 KASAN reports: BUG: KASAN: slab-out-of-bounds in snp_begin_psc+0x126/0x890 Read of size 8 at addr ffff888219ffb5e0 by task qemu-system-x86/2199 BUG: KASAN: slab-out-of-bounds in snp_begin_psc+0x468/0x890 Write of size 8 at addr ffff888351566648 by task qemu-system-x86/2199 The buggy address belongs to the object at ffff888XXXXXXXXX which belongs to the cache kmalloc-cg-32 of size 32 The buggy address is located N bytes to the right of allocated 32-byte region [ffff888XXXXXXXXX, ffff888XXXXXXXXX) Breakdown: 62 slab-out-of-bounds (reads + writes past allocation) 7 slab-use-after-free 4 use-after-free All credit to Stan for the wonderful description and reproducer! [sean: write changelog]
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基金会开源的一款操作系统内核。 Linux kernel 6.10版本存在安全漏洞，该漏洞源于GHCB scratch区域未正确使用，导致恶意SEV-SNP客户机能破坏主机内核堆内存并泄露主机堆布局信息。
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

厂商 产品 影响版本 CPE 订阅
Linux Linux 4af663c2f64a8d252e690c60cf8b8abf22dc2951 ~ bf9ba093fbb83c0c9a3dedd50efec29424eca2fc -
Linux Linux 6.10 -

二、漏洞 CVE-2026-53360 的公开POC

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三、漏洞 CVE-2026-53360 的情报信息

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CVE-2026-53360 补丁与修复 (4)

同批安全公告 · Linux · 2026-07-04 · 共 4 条

CVE-2026-53359 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-53362 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-53361 7.1 HIGH Linux kernel 安全漏洞

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53360

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