CVE-2022-49804

s390: avoid using global register for current_stack_pointer

Description

In the Linux kernel, the following vulnerability has been resolved: s390: avoid using global register for current_stack_pointer Commit 30de14b1884b ("s390: current_stack_pointer shouldn't be a function") made current_stack_pointer a global register variable like on many other architectures. Unfortunately on s390 it uncovers old gcc bug which is fixed only since gcc-9.1 [gcc commit 3ad7fed1cc87 ("S/390: Fix PR89775. Stackpointer save/restore instructions removed")] and backported to gcc-8.4 and later. Due to this bug gcc versions prior to 8.4 generate broken code which leads to stack corruptions. Current minimal gcc version required to build the kernel is declared as 5.1. It is not possible to fix all old gcc versions, so work around this problem by avoiding using global register variable for current_stack_pointer.

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/a478952a8ac44e32316dc046a063a7dc34825aa6
https://git.kernel.org/stable/c/e3c11025bcd2142a61abe5806b2f86a0e78118df

Frequently Asked Questions

What is the severity of CVE-2022-49804?: CVE-2022-49804 has not yet been assigned a CVSS score.
How to fix CVE-2022-49804?: To fix CVE-2022-49804, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-49804 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-49804 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-49804?: CVE-2022-49804 affects Linux Linux, Linux Linux.

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