CVE-2025-38696

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

State: Published
Severity: Not scored
Published: Sep 4, 2025
Updated: May 23, 2026
Reserved: Apr 16, 2025

Description

In 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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before ab18e48a503230d675e824a0d68a108bdff42503Affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before e78033e59444d257d095b73ce5d20625294f6ec2Affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before bd90dbd196831f5c2620736dc221db2634cf1e8eAffected ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before 5b6839b572b503609b9b58bc6c04a816eefa0794Affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before f22de2027b206ddfb8a075800bb5d0dacf2da4b8Affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before 82d140f6aab5e89a9d3972697a0dbe1498752d9bAffected ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before 24d098b6f69b0aa806ffcb3e18259bee31650b28Affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before cddf47d20b0325dc8a4e57b833fe96e8f36c42a4Affected ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before e9f4a6b3421e936c3ee9d74710243897d74dbaa2Affected 86717a97f9218de798c6d33e0014ab9325e18f56Affected e4882348eaa9f5f052cb21d2a5aa99a063e4308bAffected 4.14.77 to before 4.15Affected 4.18.15 to before 4.19Affected
LinuxLinux	4.19Affected before 4.19Not affected 5.4.297 through 5.4.Not affected 5.10.241 through 5.10.Not affected 5.15.190 through 5.15.Not affected 6.1.149 through 6.1.Not affected 6.6.103 through 6.6.Not affected 6.12.43 through 6.12.Not affected 6.15.11 through 6.15.Not affected 6.16.2 through 6.16.Not affected 6.17 and laterNot affected

Product

Versions

LinuxLinux

ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before ab18e48a503230d675e824a0d68a108bdff42503Affected
ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before e78033e59444d257d095b73ce5d20625294f6ec2Affected
ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before bd90dbd196831f5c2620736dc221db2634cf1e8eAffected
ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before 5b6839b572b503609b9b58bc6c04a816eefa0794Affected
ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before f22de2027b206ddfb8a075800bb5d0dacf2da4b8Affected
ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before 82d140f6aab5e89a9d3972697a0dbe1498752d9bAffected
ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before 24d098b6f69b0aa806ffcb3e18259bee31650b28Affected
ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before cddf47d20b0325dc8a4e57b833fe96e8f36c42a4Affected
ea7e0480a4b695d0aa6b3fa99bd658a003122113 to before e9f4a6b3421e936c3ee9d74710243897d74dbaa2Affected
86717a97f9218de798c6d33e0014ab9325e18f56Affected
e4882348eaa9f5f052cb21d2a5aa99a063e4308bAffected
4.14.77 to before 4.15Affected
4.18.15 to before 4.19Affected

LinuxLinux

4.19Affected
before 4.19Not affected
5.4.297 through 5.4.*Not affected
5.10.241 through 5.10.*Not affected
5.15.190 through 5.15.*Not affected
6.1.149 through 6.1.*Not affected
6.6.103 through 6.6.*Not affected
6.12.43 through 6.12.*Not affected
6.15.11 through 6.15.*Not affected
6.16.2 through 6.16.*Not affected
6.17 and laterNot affected

References

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