Описание
The strcmp implementation optimized for the Power10 processor in the GNU C Library version 2.39 and later writes to vector registers v20 to v31 without saving contents from the caller (those registers are defined as non-volatile registers by the powerpc64le ABI), resulting in overwriting of its contents and potentially altering control flow of the caller, or leaking the input strings to the function to other parts of the program.
A flaw was found in the optimized strcmp glibc function for the Power10 CPU architecture. GNU C library versions from 2.39 onward overwrite two vector registers in a way that can disrupt the control flow of a program.
Отчет
This flaw is marked as a Moderate vulnerability rather than an Important one because, while it violates the PowerPC64LE ABI by overwriting non-volatile vector registers (v20 to v31) in the optimized strcmp implementation, its impact is highly context-dependent. The vulnerability does not result in immediate memory corruption, privilege escalation, or remote code execution on its own. It only poses a risk if the overwritten registers were actively holding critical state across the call to strcmp, which is uncommon in typical usage patterns of the function. Moreover, since this issue occurs in an architecture-specific optimization path for Power10 and affects a relatively recent version of glibc (2.39+), its exposure is limited in scope and deployment. Note that this vulnerability only impacts POWER10 (ppc64le), not POWER9, nor the aarch64, s390x, x86-64 products.
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 6 | compat-glibc | Not affected | ||
| Red Hat Enterprise Linux 6 | glibc | Not affected | ||
| Red Hat Enterprise Linux 7 | compat-glibc | Not affected | ||
| Red Hat Enterprise Linux 7 | glibc | Not affected | ||
| Red Hat Enterprise Linux 8 | glibc | Not affected | ||
| Red Hat Enterprise Linux 10 | glibc | Fixed | RHSA-2025:11066 | 15.07.2025 |
| Red Hat Enterprise Linux 9 | glibc | Fixed | RHSA-2025:9877 | 30.06.2025 |
| Red Hat Enterprise Linux 9 | glibc | Fixed | RHSA-2025:9877 | 30.06.2025 |
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Дополнительная информация
Статус:
EPSS
5.6 Medium
CVSS3
Связанные уязвимости
The strcmp implementation optimized for the Power10 processor in the GNU C Library version 2.39 and later writes to vector registers v20 to v31 without saving contents from the caller (those registers are defined as non-volatile registers by the powerpc64le ABI), resulting in overwriting of its contents and potentially altering control flow of the caller, or leaking the input strings to the function to other parts of the program.
The strcmp implementation optimized for the Power10 processor in the GNU C Library version 2.39 and later writes to vector registers v20 to v31 without saving contents from the caller (those registers are defined as non-volatile registers by the powerpc64le ABI), resulting in overwriting of its contents and potentially altering control flow of the caller, or leaking the input strings to the function to other parts of the program.
The strcmp implementation optimized for the Power10 processor in the G ...
The strcmp implementation optimized for the Power10 processor in the GNU C Library version 2.39 and later writes to vector registers v20 to v31 without saving contents from the caller (those registers are defined as non-volatile registers by the powerpc64le ABI), resulting in overwriting of its contents and potentially altering control flow of the caller, or leaking the input strings to the function to other parts of the program.
EPSS
5.6 Medium
CVSS3