MIPS: Don't crash in stack_top() for tasks without ABI or vDSO

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Summary

CVECVE-2025-38696
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-04 16:15:38 UTC
Updated2026-05-12 13:16:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: MIPS: Don't crash in stack_top() for tasks without ABI or vDSO Not all tasks have an ABI associated or vDSO mapped, for example kthreads never do. If such a task ever ends up calling stack_top(), it will derefence the NULL ABI pointer and crash. This can for example happen when using kunit: mips_stack_top+0x28/0xc0 arch_pick_mmap_layout+0x190/0x220 kunit_vm_mmap_init+0xf8/0x138 __kunit_add_resource+0x40/0xa8 kunit_vm_mmap+0x88/0xd8 usercopy_test_init+0xb8/0x240 kunit_try_run_case+0x5c/0x1a8 kunit_generic_run_threadfn_adapter+0x28/0x50 kthread+0x118/0x240 ret_from_kernel_thread+0x14/0x1c Only dereference the ABI point if it is set. The GIC page is also included as it is specific to the vDSO. Also move the randomization adjustment into the same conditional.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: CWE-476

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 ea7e0480a4b695d0aa6b3fa99bd658a003122113 ab18e48a503230d675e824a0d68a108bdff42503 git Not specified
CNA Linux Linux affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 e78033e59444d257d095b73ce5d20625294f6ec2 git Not specified
CNA Linux Linux affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 bd90dbd196831f5c2620736dc221db2634cf1e8e git Not specified
CNA Linux Linux affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 5b6839b572b503609b9b58bc6c04a816eefa0794 git Not specified
CNA Linux Linux affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 f22de2027b206ddfb8a075800bb5d0dacf2da4b8 git Not specified
CNA Linux Linux affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 82d140f6aab5e89a9d3972697a0dbe1498752d9b git Not specified
CNA Linux Linux affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 24d098b6f69b0aa806ffcb3e18259bee31650b28 git Not specified
CNA Linux Linux affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 cddf47d20b0325dc8a4e57b833fe96e8f36c42a4 git Not specified
CNA Linux Linux affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 e9f4a6b3421e936c3ee9d74710243897d74dbaa2 git Not specified
CNA Linux Linux affected 86717a97f9218de798c6d33e0014ab9325e18f56 git Not specified
CNA Linux Linux affected e4882348eaa9f5f052cb21d2a5aa99a063e4308b git Not specified
CNA Linux Linux affected 4.19 Not specified
CNA Linux Linux unaffected 4.19 semver Not specified
CNA Linux Linux unaffected 5.4.297 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.241 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.190 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.149 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.103 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.43 6.12.* semver Not specified
CNA Linux Linux unaffected 6.15.11 6.15.* semver Not specified
CNA Linux Linux unaffected 6.16.2 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC CN 4100 affected V5.0 custom Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/24d098b6f69b0aa806ffcb3e18259bee31650b28 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/bd90dbd196831f5c2620736dc221db2634cf1e8e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ab18e48a503230d675e824a0d68a108bdff42503 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/82d140f6aab5e89a9d3972697a0dbe1498752d9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f22de2027b206ddfb8a075800bb5d0dacf2da4b8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-032379.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/cddf47d20b0325dc8a4e57b833fe96e8f36c42a4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5b6839b572b503609b9b58bc6c04a816eefa0794 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e78033e59444d257d095b73ce5d20625294f6ec2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e9f4a6b3421e936c3ee9d74710243897d74dbaa2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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