Medium severity · published Sep 4, 2025
CVE-2025-38696
MIPS: Don't crash in stack_top() for tasks without ABI or vDSO
5.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
4.14.77 before 4.15; 4.18.15 before 4.19; 4.19.1 before 5.4.297; 5.5 before 5.10.241; 5.11 before 5.15.190; 5.16 before 6.1.149; +6 more · source: NVD
LI
Linux · Linux
ea7e0480a4b695d0aa6b3fa99bd658a003122113 before ab18e48a503230d675e824a0d68a108bdff42503; ea7e0480a4b695d0aa6b3fa99bd658a003122113 before e78033e59444d257d095b73ce5d20625294f6ec2; ea7e0480a4b695d0aa6b3fa99bd658a003122113 before bd90dbd196831f5c2620736dc221db2634cf1e8e; ea7e0480a4b695d0aa6b3fa99bd658a003122113 before 5b6839b572b503609b9b58bc6c04a816eefa0794; ea7e0480a4b695d0aa6b3fa99bd658a003122113 before f22de2027b206ddfb8a075800bb5d0dacf2da4b8; ea7e0480a4b695d0aa6b3fa99bd658a003122113 before 82d140f6aab5e89a9d3972697a0dbe1498752d9b; +8 more · source: vendor
DL
Debian Linux · Debian
11.0 · source: NVD
SC
SIMATIC CN 4100 · Siemens
before V5.0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-38696
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-38696
Patch
https://git.kernel.org/stable/c/24d098b6f69b0aa806ffcb3e18259bee31650b28
Patch
https://git.kernel.org/stable/c/5b6839b572b503609b9b58bc6c04a816eefa0794
Patch
https://git.kernel.org/stable/c/82d140f6aab5e89a9d3972697a0dbe1498752d9b
Patch
https://git.kernel.org/stable/c/ab18e48a503230d675e824a0d68a108bdff42503
Patch
https://git.kernel.org/stable/c/bd90dbd196831f5c2620736dc221db2634cf1e8e
Patch
https://git.kernel.org/stable/c/cddf47d20b0325dc8a4e57b833fe96e8f36c42a4
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