5.5

CVE-2025-38696

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.14.77 < 4.15
Linux ≫ Linux Kernel Version >= 4.18.15 < 4.19
Linux ≫ Linux Kernel Version >= 4.19.1 < 5.4.297
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.241
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.190
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.149
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.103
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.43
Linux ≫ Linux Kernel Version >= 6.13 < 6.15.11
Linux ≫ Linux Kernel Version >= 6.16 < 6.16.2
Linux ≫ Linux Kernel Version4.19 Update-
Linux ≫ Linux Kernel Version4.19 Updaterc8
Debian ≫ Debian Linux Version11.0
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.17% 0.066
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/ab18e48a503230d675e824a0d68a108bdff42503
Patch
https://git.kernel.org/stable/c/e78033e59444d257d095b73ce5d20625294f6ec2
Patch
https://git.kernel.org/stable/c/bd90dbd196831f5c2620736dc221db2634cf1e8e
Patch
https://git.kernel.org/stable/c/5b6839b572b503609b9b58bc6c04a816eefa0794
Patch
https://git.kernel.org/stable/c/f22de2027b206ddfb8a075800bb5d0dacf2da4b8
Patch
https://git.kernel.org/stable/c/82d140f6aab5e89a9d3972697a0dbe1498752d9b
Patch
https://git.kernel.org/stable/c/24d098b6f69b0aa806ffcb3e18259bee31650b28
Patch
https://git.kernel.org/stable/c/cddf47d20b0325dc8a4e57b833fe96e8f36c42a4
Patch
https://git.kernel.org/stable/c/e9f4a6b3421e936c3ee9d74710243897d74dbaa2
Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Third Party Advisory
Mailing List
https://cert-portal.siemens.com/productcert/html/ssa-032379.html