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

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MEDIUM

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

Published Sep 4, 2025

5.5

MEDIUM

CVSS 3.1

EPSS 0.19%

Description

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.

Affected products

Vendor Linux Product Linux Default
unaffected
- Version
  4.14.77
  Status
  affected
  Constraints
  <4.15
- Version
  4.18.15
  Status
  affected
  Constraints
  <4.19
Vendor Linux Product Linux Default
unaffected
- Version
  
  Status
  affected
  Constraints
  -
- Version
  
  Status
  affected
  Constraints
  -
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
Vendor Linux Product Linux Default
affected
- Version
  4.19
  Status
  affected
  Constraints
  -
- Version
  0
  Status
  unaffected
  Constraints
  <4.19
- Version
  5.10.241
  Status
  unaffected
  Constraints
  <=5.10.*
- Version
  5.15.190
  Status
  unaffected
  Constraints
  <=5.15.*
- Version
  5.4.297
  Status
  unaffected
  Constraints
  <=5.4.*
- Version
  6.1.149
  Status
  unaffected
  Constraints
  <=6.1.*
- Version
  6.12.43
  Status
  unaffected
  Constraints
  <=6.12.*
- Version
  6.15.11
  Status
  unaffected
  Constraints
  <=6.15.*
- Version
  6.16.2
  Status
  unaffected
  Constraints
  <=6.16.*
- Version
  6.17
  Status
  unaffected
  Constraints
  <=*
- Version
  6.6.103
  Status
  unaffected
  Constraints
  <=6.6.*

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Linux

unaffected

Version	Status	Constraints
4.14.77	affected	<4.15
4.18.15	affected	<4.19

Linux

unaffected

Version	Status	Constraints
	affected	-
	affected	-
	affected
	affected
	affected
	affected
	affected
	affected
	affected
	affected
	affected

Linux

affected

Version	Status	Constraints
4.19	affected	-
0	unaffected	<4.19
5.10.241	unaffected	<=5.10.*
5.15.190	unaffected	<=5.15.*
5.4.297	unaffected	<=5.4.*
6.1.149	unaffected	<=6.1.*
6.12.43	unaffected	<=6.12.*
6.15.11	unaffected	<=6.15.*
6.16.2	unaffected	<=6.16.*
6.17	unaffected	<=*
6.6.103	unaffected	<=6.6.*

Red Hat Enterprise Linux 10

kernel

Not affected
Red Hat Enterprise Linux 6

kernel

Not affected
Red Hat Enterprise Linux 7

kernel

Not affected
Red Hat Enterprise Linux 7

kernel-rt

Not affected
Red Hat Enterprise Linux 8

kernel

Not affected
Red Hat Enterprise Linux 8

kernel-rt

Not affected
Red Hat Enterprise Linux 9

kernel

Not affected
Red Hat Enterprise Linux 9

kernel-rt

Not affected

Product	Package	State	Advisory
Red Hat Enterprise Linux 10	kernel	Not affected	n/a
Red Hat Enterprise Linux 6	kernel	Not affected	n/a
Red Hat Enterprise Linux 7	kernel	Not affected	n/a
Red Hat Enterprise Linux 7	kernel-rt	Not affected	n/a
Red Hat Enterprise Linux 8	kernel	Not affected	n/a
Red Hat Enterprise Linux 8	kernel-rt	Not affected	n/a
Red Hat Enterprise Linux 9	kernel	Not affected	n/a
Red Hat Enterprise Linux 9	kernel-rt	Not affected	n/a

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-476

NULL Pointer Dereference

References (16)

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2025-38696		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2393199		Issue Tracking
https://cert-portal.siemens.com/productcert/html/ssa-032379.html
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		Patch
https://git.kernel.org/stable/c/e78033e59444d257d095b73ce5d20625294f6ec2		Patch
https://git.kernel.org/stable/c/e9f4a6b3421e936c3ee9d74710243897d74dbaa2		Patch
https://git.kernel.org/stable/c/f22de2027b206ddfb8a075800bb5d0dacf2da4b8		Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html		Mailing ListThird Party Advisory
https://lore.kernel.org/linux-cve-announce/2025090451-CVE-2025-38696-4ec2@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2025-38696
https://www.cve.org/CVERecord?id=CVE-2025-38696