Описание
fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.
An out-of-bounds write flaw was found in the Linux kernel's seq_file in the Filesystem layer. This flaw allows a local attacker with a user privilege to gain access to out-of-bound memory, leading to a system crash, leak of internal kernel information and can escalate privileges. The issue results from not validating the size_t-to-int conversion prior to performing operations. The highest threat from this vulnerability is to data integrity, confidentiality and system availability.
Отчет
Any Red Hat product which relies on the Red Hat Enterprise Linux kernel is also potentially impacted. This includes layered products such as OpenShift Container Platform, OpenStack, Red Hat Virtualization, and others.
Меры по смягчению последствий
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel-alt | Out of support scope | ||
| Red Hat Enterprise Linux 9 | kernel | Not affected | ||
| Red Hat Enterprise Linux 6 Extended Lifecycle Support | kernel | Fixed | RHSA-2021:2735 | 20.07.2021 |
| Red Hat Enterprise Linux 7 | kernel-rt | Fixed | RHSA-2021:2726 | 21.07.2021 |
| Red Hat Enterprise Linux 7 | kernel | Fixed | RHSA-2021:2725 | 21.07.2021 |
| Red Hat Enterprise Linux 7 | kpatch-patch | Fixed | RHSA-2021:2727 | 20.07.2021 |
| Red Hat Enterprise Linux 7.2 Advanced Update Support | kernel | Fixed | RHSA-2021:2734 | 20.07.2021 |
| Red Hat Enterprise Linux 7.3 Advanced Update Support | kernel | Fixed | RHSA-2021:2733 | 20.07.2021 |
| Red Hat Enterprise Linux 7.4 Advanced Update Support | kernel | Fixed | RHSA-2021:2732 | 20.07.2021 |
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Дополнительная информация
Статус:
EPSS
7.8 High
CVSS3
Связанные уязвимости
fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.
fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.
fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 do ...
fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.
EPSS
7.8 High
CVSS3