s390: fix double free of GS and RI CBs on fork() failure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2022-49990
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-06-18 11:15:26 UTC
Updated2026-08-04 10:18:02 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-415

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8d9047f8b967ce6181fd824ae922978e1b055cc0 25a95303b9e513cd2978aacc385d06e6fec23d07 git Not specified
CNA Linux Linux affected 8d9047f8b967ce6181fd824ae922978e1b055cc0 cacd522e6652fbc2dc0cc6ae11c4e30782fef14b git Not specified
CNA Linux Linux affected 8d9047f8b967ce6181fd824ae922978e1b055cc0 297ae7e87a87a001dd3dfeac1cb26a42fd929708 git Not specified
CNA Linux Linux affected 8d9047f8b967ce6181fd824ae922978e1b055cc0 8195e065abf3df84eb0ad2987e76a40f21d1791c git Not specified
CNA Linux Linux affected 8d9047f8b967ce6181fd824ae922978e1b055cc0 fbdc482d43eda40a70de4b0155843d5472f6de62 git Not specified
CNA Linux Linux affected 8d9047f8b967ce6181fd824ae922978e1b055cc0 13cccafe0edcd03bf1c841de8ab8a1c8e34f77d9 git Not specified
CNA Linux Linux affected 9e51ee1b76efc7b5e9404010793a39fde0e03cb7 git Not specified
CNA Linux Linux affected 232b47b3c88af1da737cd7760f247c4ed58168cf git Not specified
CNA Linux Linux affected b8e212c599082896a180a18a0c9bd529526590be git Not specified
CNA Linux Linux affected 4.4.105 4.5 semver Not specified
CNA Linux Linux affected 4.9.68 4.10 semver Not specified
CNA Linux Linux affected 4.14.5 4.15 semver Not specified
CNA Linux Linux affected 4.15 Not specified
CNA Linux Linux unaffected 4.15 semver Not specified
CNA Linux Linux unaffected 4.19.257 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.212 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.140 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.64 5.15.* semver Not specified
CNA Linux Linux unaffected 5.19.6 5.19.* semver Not specified
CNA Linux Linux unaffected 6.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/25a95303b9e513cd2978aacc385d06e6fec23d07 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cacd522e6652fbc2dc0cc6ae11c4e30782fef14b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8195e065abf3df84eb0ad2987e76a40f21d1791c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/13cccafe0edcd03bf1c841de8ab8a1c8e34f77d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/297ae7e87a87a001dd3dfeac1cb26a42fd929708 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fbdc482d43eda40a70de4b0155843d5472f6de62 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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