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CVE-2025-38696
MIPS: Don't crash in stack_top() for tasks without ABI or vDSO
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.

INFO

Published Date :

Sept. 4, 2025, 4:15 p.m.

Last Modified :

Sept. 4, 2025, 4:15 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-38696 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Avoid NULL pointer dereference by checking ABI pointer before use.
  • Check ABI pointer before dereferencing.
  • Conditionally adjust randomization.
  • Include GIC page if using vDSO.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-38696.

URL Resource
https://git.kernel.org/stable/c/24d098b6f69b0aa806ffcb3e18259bee31650b28
https://git.kernel.org/stable/c/5b6839b572b503609b9b58bc6c04a816eefa0794
https://git.kernel.org/stable/c/82d140f6aab5e89a9d3972697a0dbe1498752d9b
https://git.kernel.org/stable/c/ab18e48a503230d675e824a0d68a108bdff42503
https://git.kernel.org/stable/c/bd90dbd196831f5c2620736dc221db2634cf1e8e
https://git.kernel.org/stable/c/cddf47d20b0325dc8a4e57b833fe96e8f36c42a4
https://git.kernel.org/stable/c/e78033e59444d257d095b73ce5d20625294f6ec2
https://git.kernel.org/stable/c/e9f4a6b3421e936c3ee9d74710243897d74dbaa2
https://git.kernel.org/stable/c/f22de2027b206ddfb8a075800bb5d0dacf2da4b8
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-38696 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-38696 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-38696 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-38696 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Sep. 04, 2025

    Action Type Old Value New Value
    Added 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.
    Added Reference https://git.kernel.org/stable/c/24d098b6f69b0aa806ffcb3e18259bee31650b28
    Added Reference https://git.kernel.org/stable/c/5b6839b572b503609b9b58bc6c04a816eefa0794
    Added Reference https://git.kernel.org/stable/c/82d140f6aab5e89a9d3972697a0dbe1498752d9b
    Added Reference https://git.kernel.org/stable/c/ab18e48a503230d675e824a0d68a108bdff42503
    Added Reference https://git.kernel.org/stable/c/bd90dbd196831f5c2620736dc221db2634cf1e8e
    Added Reference https://git.kernel.org/stable/c/cddf47d20b0325dc8a4e57b833fe96e8f36c42a4
    Added Reference https://git.kernel.org/stable/c/e78033e59444d257d095b73ce5d20625294f6ec2
    Added Reference https://git.kernel.org/stable/c/e9f4a6b3421e936c3ee9d74710243897d74dbaa2
    Added Reference https://git.kernel.org/stable/c/f22de2027b206ddfb8a075800bb5d0dacf2da4b8
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.