Описание
In the Linux kernel, the following vulnerability has been resolved:
x86/CPU/AMD: Add RDSEED fix for Zen5
There's an issue with RDSEED's 16-bit and 32-bit register output
variants on Zen5 which return a random value of 0 "at a rate inconsistent
with randomness while incorrectly signaling success (CF=1)". Search the
web for AMD-SB-7055 for more detail.
Add a fix glue which checks microcode revisions.
[ bp: Add microcode revisions checking, rewrite. ]
A flaw was found in the Linux kernel. A local user could exploit a vulnerability in the RDSEED (Random Seed) instruction on AMD Zen5 processors. This issue causes the RDSEED instruction to return a random value of zero, which is inconsistent with expected randomness and incorrectly signals success. This can lead to a denial of service (DoS) by compromising operations that rely on high-quality random number generation.
Отчет
A moderate-impact flaw was found in the Linux kernel's use of the RDSEED instruction on AMD Zen5 processors. On affected AMD Zen5 CPUs, the 16-bit and 32-bit register output variants of RDSEED can return a random value of 0 at a rate inconsistent with randomness while incorrectly signaling success (CF=1). A local user on an affected system could exploit this behavior to compromise operations that rely on high-quality random number generation, resulting in a denial of service. Red Hat rates this flaw Moderate, with CVSS 3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (5.5), because the impact on Red Hat products is limited to availability. This differs from the upstream CVE.org record, which scores the issue 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N) based on potential confidentiality and integrity impact from the consumption of insufficiently random values. The kernel and kernel-rt packages in Red Hat Enterprise Linux 7, 8, 9, and 10, and the kernel package in Red Hat In-Vehicle OS 1.1, are affected, with fixes currently deferred for these streams; until a fix is delivered, systems running on AMD Zen5 hardware remain exposed to RDSEED returning zero values while signaling success, which can affect the availability of services that depend on that randomness. Red Hat Enterprise Linux 6 is not affected because the vulnerable code is not present. The upstream Linux fix adds a check of the AMD microcode revision to address the inconsistent RDSEED behavior.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Fix deferred | ||
| Red Hat Enterprise Linux 6 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel | Fix deferred | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Fix deferred | ||
| Red Hat Enterprise Linux 8 | kernel | Fix deferred | ||
| Red Hat Enterprise Linux 8 | kernel-rt | Fix deferred | ||
| Red Hat Enterprise Linux 9 | kernel | Fix deferred | ||
| Red Hat Enterprise Linux 9 | kernel-rt | Fix deferred |
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Дополнительная информация
Статус:
EPSS
5.5 Medium
CVSS3
Связанные уязвимости
In the Linux kernel, the following vulnerability has been resolved: x86/CPU/AMD: Add RDSEED fix for Zen5 There's an issue with RDSEED's 16-bit and 32-bit register output variants on Zen5 which return a random value of 0 "at a rate inconsistent with randomness while incorrectly signaling success (CF=1)". Search the web for AMD-SB-7055 for more detail. Add a fix glue which checks microcode revisions. [ bp: Add microcode revisions checking, rewrite. ]
In the Linux kernel, the following vulnerability has been resolved: x86/CPU/AMD: Add RDSEED fix for Zen5 There's an issue with RDSEED's 16-bit and 32-bit register output variants on Zen5 which return a random value of 0 "at a rate inconsistent with randomness while incorrectly signaling success (CF=1)". Search the web for AMD-SB-7055 for more detail. Add a fix glue which checks microcode revisions. [ bp: Add microcode revisions checking, rewrite. ]
In the Linux kernel, the following vulnerability has been resolved: x ...
In the Linux kernel, the following vulnerability has been resolved: x86/CPU/AMD: Add RDSEED fix for Zen5 There's an issue with RDSEED's 16-bit and 32-bit register output variants on Zen5 which return a random value of 0 "at a rate inconsistent with randomness while incorrectly signaling success (CF=1)". Search the web for AMD-SB-7055 for more detail. Add a fix glue which checks microcode revisions. [ bp: Add microcode revisions checking, rewrite. ]
EPSS
5.5 Medium
CVSS3