CVE-2022-49990

High

In the Linux kernel, the following vulnerability has been resolved: s390: fix double free of GS and RI CBs on fork() failure The pointers for guarded storage and runtime instrumentation control blocks are stored in the thread_struct of the associated task. These pointers are initially copied on fork() via arch_dup_task_struct() and then cleared via copy_thread() before fork() returns. If fork() happens to fail after the initial task dup and before copy_thread(), the newly allocated task and associated thread_struct memory are freed via free_task() -> arch_release_task_struct(). This results in a double free of the guarded storage and runtime info structs because the fields in the failed task still refer to memory associated with the source task. This problem can manifest as a BUG_ON() in set_freepointer() (with CONFIG_SLAB_FREELIST_HARDENED enabled) or KASAN splat (if enabled) when running trinity syscall fuzz tests on s390x. To avoid this problem, clear the associated pointer fields in arch_dup_task_struct() immediately after the new task is copied. Note that the RI flag is still cleared in copy_thread() because it resides in thread stack memory and that is where stack info is copied.

Package Linux Kernel
Published 2025-06-18
Last modified 2025-11-14
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

7.8

out of 10
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-415

CVE-2022-49990 is classified as CWE-415

See CWE-415 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 4.4.105, 4.9.68, 4.14.5, 4.15 and later are affected. Fixed in 4.19.257, 5.4.212, 5.10.140, 5.15.64, 5.19.6, 6.0 and their respective stable series.

Affected from
≥ 4.4.105 ≥ 4.9.68 ≥ 4.14.5 ≥ 4.15
Fixed in
✓ 4.19.257 4.19.x ✓ 5.4.212 5.4.x ✓ 5.10.140 5.10.x ✓ 5.15.64 5.15.x ✓ 5.19.6 5.19.x ✓ 6.0

References

The following references provide additional information about CVE-2022-49990 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

6 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2022-49990?

    CVE-2022-49990 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 4.4.105 onward and has been patched in 4.19.257, 5.4.212, 5.10.140 and others. CVE-2022-49990 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2022-49990?

    CVE-2022-49990 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H .

  • Is there a patch available for CVE-2022-49990?

    Yes — CVE-2022-49990 has been patched. Fixed versions include 4.19.257, 5.4.212, 5.10.140 and others. If you are running Linux kernel 4.4.105 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2022-49990 actively exploited?

    No — CVE-2022-49990 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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