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CVE-2026-43492— 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mpi_read_raw_from_sgl()函数中存在整数下溢问题，可能导致内存损坏。

AI 预测 7.8 利用难度: 中等 EPSS 0.15% · P4

影响版本矩阵 18

厂商产品 版本范围状态
Linux Linux 2d4d1eea540b27c72488fd1914674c42473d53df< a1793a48881ec8d26e9c79b0ee65753f1c6846a4 affected
2d4d1eea540b27c72488fd1914674c42473d53df< 1abd50fc3cfa16fc2074a3c8c2729c50fd9d7043 affected
2d4d1eea540b27c72488fd1914674c42473d53df< 6d63615c796c085b4984e3031b9fa77fffb47360 affected
2d4d1eea540b27c72488fd1914674c42473d53df< 2aa77a18dc7f2670497fe3ee5acbeda0b57659e5 affected
2d4d1eea540b27c72488fd1914674c42473d53df< 26d3a97ad46c7a9226ec04d4bf35bd4998a97d16 affected
2d4d1eea540b27c72488fd1914674c42473d53df< 8637dfb4c1d8a7026ef681f2477c6de8b71c4003 affected
2d4d1eea540b27c72488fd1914674c42473d53df< 30e513e755bb381afce6fb57cdc8694136193f22 affected
2d4d1eea540b27c72488fd1914674c42473d53df< 8c2f1288250a90a4b5cabed5d888d7e3aeed4035 affected
… +10 条更多
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一、 漏洞 CVE-2026-43492 基础信息

漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
lib/crypto: mpi: Fix integer underflow in mpi_read_raw_from_sgl()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: lib/crypto: mpi: Fix integer underflow in mpi_read_raw_from_sgl() Yiming reports an integer underflow in mpi_read_raw_from_sgl() when subtracting "lzeros" from the unsigned "nbytes". For this to happen, the scatterlist "sgl" needs to occupy more bytes than the "nbytes" parameter and the first "nbytes + 1" bytes of the scatterlist must be zero. Under these conditions, the while loop iterating over the scatterlist will count more zeroes than "nbytes", subtract the number of zeroes from "nbytes" and cause the underflow. When commit 2d4d1eea540b ("lib/mpi: Add mpi sgl helpers") originally introduced the bug, it couldn't be triggered because all callers of mpi_read_raw_from_sgl() passed a scatterlist whose length was equal to "nbytes". However since commit 63ba4d67594a ("KEYS: asymmetric: Use new crypto interface without scatterlists"), the underflow can now actually be triggered. When invoking a KEYCTL_PKEY_ENCRYPT system call with a larger "out_len" than "in_len" and filling the "in" buffer with zeroes, crypto_akcipher_sync_prep() will create an all-zero scatterlist used for both the "src" and "dst" member of struct akcipher_request and thereby fulfil the conditions to trigger the bug: sys_keyctl() keyctl_pkey_e_d_s() asymmetric_key_eds_op() software_key_eds_op() crypto_akcipher_sync_encrypt() crypto_akcipher_sync_prep() crypto_akcipher_encrypt() rsa_enc() mpi_read_raw_from_sgl() To the user this will be visible as a DoS as the kernel spins forever, causing soft lockup splats as a side effect. Fix it.
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mpi_read_raw_from_sgl()函数中存在整数下溢问题，可能导致内存损坏。
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 2d4d1eea540b27c72488fd1914674c42473d53df ~ a1793a48881ec8d26e9c79b0ee65753f1c6846a4 -
Linux Linux 4.4 -

二、漏洞 CVE-2026-43492 的公开POC

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三、漏洞 CVE-2026-43492 的情报信息

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CVE-2026-43492 补丁与修复 (8)

同批安全公告 · Linux · 2026-05-19 · 共 3 条

CVE-2026-43493 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-43491 Linux kernel 安全漏洞

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43492

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