CVE-2026-63794— 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 4.16版本存在安全漏洞，该漏洞源于sev_dbg_crypt函数在ENCRYPT路径中未使用目标页面偏移量限制单次迭代传输长度，可能导致页溢出。
可能的 ATT&CK 技术 1 AI
T1203 · Exploitation for Client Execution影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 24f41fb23a39bc2b6f190dcef35a5813a4bf183a< f701ae476cb92a3a3d8844bb39bb63b4512684c8 |
affected |
24f41fb23a39bc2b6f190dcef35a5813a4bf183a< 64f2449841ffc7d203183aa4c748c9c77951ecc5 |
affected | ||
24f41fb23a39bc2b6f190dcef35a5813a4bf183a< 9349b50f4b11f135fe73b56cb2c2c872d8bc71d7 |
affected | ||
24f41fb23a39bc2b6f190dcef35a5813a4bf183a< 889c2a9c59897ca912bf39df5bb92555a0a13df4 |
affected | ||
24f41fb23a39bc2b6f190dcef35a5813a4bf183a< e1a0fe288dee07b7da25a71e007c1ecd1080315b |
affected | ||
24f41fb23a39bc2b6f190dcef35a5813a4bf183a< 720949ed666f34ff28ffdfe1471a5861d1e41fdf |
affected | ||
24f41fb23a39bc2b6f190dcef35a5813a4bf183a< 2753a097d1fe24c4351c608048612c74108aa89f |
affected | ||
24f41fb23a39bc2b6f190dcef35a5813a4bf183a< 78ee2d50185a037b3d2452a97f3dad69c3f7f389 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-63794 基础信息
漏洞信息
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Vulnerability Title
KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
KVM: SVM: Fix page overflow in sev_dbg_crypt() for ENCRYPT path
In sev_dbg_crypt(), the per-iteration transfer length is bounded by
the source page offset (PAGE_SIZE - s_off) but not by the destination
page offset (PAGE_SIZE - d_off). When d_off > s_off, the encrypt
path (__sev_dbg_encrypt_user) performs a read-modify-write using a
single-page intermediate buffer (dst_tpage):
1. __sev_dbg_decrypt() expands the size to round_up(len + (d_off & 15), 16)
before issuing the PSP command. If len + (d_off & 15) > PAGE_SIZE,
the PSP writes beyond the end of the 4096-byte dst_tpage allocation.
2. The subsequent memcpy()/copy_from_user() into
page_address(dst_tpage) + (d_off & 15) of 'len' bytes overflows
by up to 15 bytes under the same condition.
Trigger example: s_off = 0, d_off = 1, debug.len = PAGE_SIZE -
the PSP is instructed to write round_up(4097, 16) = 4112 bytes to
a 4096-byte buffer.
Fix by also bounding len by (PAGE_SIZE - d_off), the same check that
sev_send_update_data() already performs for its single-page guest
region.
==================================================================
BUG: KASAN: slab-use-after-free in sev_dbg_crypt+0x993/0xd10 [kvm_amd]
Write of size 4095 at addr ff110062293bb009 by task sev_dbg_test/228214
CPU: 96 UID: 0 PID: 228214 Comm: sev_dbg_test Tainted: G U W 7.0.0-smp--5ce9b0c48211-dbg #156 PREEMPTLAZY
Tainted: [U]=USER, [W]=WARN
Hardware name: Google Astoria/astoria, BIOS 0.20250817.1-0 08/25/2025
Call Trace:
<TASK>
dump_stack_lvl+0x54/0x70
print_report+0xbc/0x260
kasan_report+0xa2/0xd0
kasan_check_range+0x25f/0x2c0
__asan_memcpy+0x40/0x70
sev_dbg_crypt+0x993/0xd10 [kvm_amd]
sev_mem_enc_ioctl+0x33c/0x450 [kvm_amd]
kvm_vm_ioctl+0x65d/0x6d0 [kvm]
__se_sys_ioctl+0xb2/0x100
do_syscall_64+0xe8/0x870
entry_SYSCALL_64_after_hwframe+0x4b/0x53
</TASK>
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x7fe72b6a0 pfn:0x62293bb
memcg:ff11000112827d82
flags: 0x1400000000000000(node=1|zone=1)
raw: 1400000000000000 0000000000000000 dead000000000122 0000000000000000
raw: 00000007fe72b6a0 0000000000000000 00000001ffffffff ff11000112827d82
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ff110062293bbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ff110062293bbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ff110062293bc000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ff110062293bc080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ff110062293bc100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
Disabling lock debugging due to kernel taint
[sean: add sample KASAN splat, Fixes, and stable@]
来源: CVE Program / CVE List V5
CVSS Information
N/A
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 4.16版本存在安全漏洞，该漏洞源于sev_dbg_crypt函数在ENCRYPT路径中未使用目标页面偏移量限制单次迭代传输长度，可能导致页溢出。
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-2026-63794 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-63794 补丁与修复 (8)
同批安全公告 · Linux · 2026-07-19 · 共 429 条
| CVE-2026-63795 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64046 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63984 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63800 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63979 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64142 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63978 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64056 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63808 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64055 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63922 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64033 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64113 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63825 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64016 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64122 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64047 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64035 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64025 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64150 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 429 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-63794
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