{"id":"CVE-2025-38696","state":"PUBLISHED","title":"MIPS: Don't crash in stack_top() for tasks without ABI or vDSO","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nMIPS: Don't crash in stack_top() for tasks without ABI or vDSO\n\nNot all tasks have an ABI associated or vDSO mapped,\nfor example kthreads never do.\nIf such a task ever ends up calling stack_top(), it will derefence the\nNULL ABI pointer and crash.\n\nThis can for example happen when using kunit:\n\n    mips_stack_top+0x28/0xc0\n    arch_pick_mmap_layout+0x190/0x220\n    kunit_vm_mmap_init+0xf8/0x138\n    __kunit_add_resource+0x40/0xa8\n    kunit_vm_mmap+0x88/0xd8\n    usercopy_test_init+0xb8/0x240\n    kunit_try_run_case+0x5c/0x1a8\n    kunit_generic_run_threadfn_adapter+0x28/0x50\n    kthread+0x118/0x240\n    ret_from_kernel_thread+0x14/0x1c\n\nOnly dereference the ABI point if it is set.\n\nThe GIC page is also included as it is specific to the vDSO.\nAlso move the randomization adjustment into the same conditional.","publishedAt":"2025-09-04T15:32:48.973Z","updatedAt":"2026-05-23T16:00:23.673Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ea7e0480a4b695d0aa6b3fa99bd658a003122113","status":"affected","lessThan":"ab18e48a503230d675e824a0d68a108bdff42503","versionType":"git"},{"version":"ea7e0480a4b695d0aa6b3fa99bd658a003122113","status":"affected","lessThan":"e78033e59444d257d095b73ce5d20625294f6ec2","versionType":"git"},{"version":"ea7e0480a4b695d0aa6b3fa99bd658a003122113","status":"affected","lessThan":"bd90dbd196831f5c2620736dc221db2634cf1e8e","versionType":"git"},{"version":"ea7e0480a4b695d0aa6b3fa99bd658a003122113","status":"affected","lessThan":"5b6839b572b503609b9b58bc6c04a816eefa0794","versionType":"git"},{"version":"ea7e0480a4b695d0aa6b3fa99bd658a003122113","status":"affected","lessThan":"f22de2027b206ddfb8a075800bb5d0dacf2da4b8","versionType":"git"},{"version":"ea7e0480a4b695d0aa6b3fa99bd658a003122113","status":"affected","lessThan":"82d140f6aab5e89a9d3972697a0dbe1498752d9b","versionType":"git"},{"version":"ea7e0480a4b695d0aa6b3fa99bd658a003122113","status":"affected","lessThan":"24d098b6f69b0aa806ffcb3e18259bee31650b28","versionType":"git"},{"version":"ea7e0480a4b695d0aa6b3fa99bd658a003122113","status":"affected","lessThan":"cddf47d20b0325dc8a4e57b833fe96e8f36c42a4","versionType":"git"},{"version":"ea7e0480a4b695d0aa6b3fa99bd658a003122113","status":"affected","lessThan":"e9f4a6b3421e936c3ee9d74710243897d74dbaa2","versionType":"git"},{"version":"86717a97f9218de798c6d33e0014ab9325e18f56","status":"affected","versionType":"git"},{"version":"e4882348eaa9f5f052cb21d2a5aa99a063e4308b","status":"affected","versionType":"git"},{"version":"4.14.77","status":"affected","lessThan":"4.15","versionType":"semver"},{"version":"4.18.15","status":"affected","lessThan":"4.19","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/mips/kernel/process.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"5.4.297","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.241","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.190","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.149","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.103","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.43","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.15.11","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16.2","status":"unaffected","lessThanOrEqual":"6.16.*","versionType":"semver"},{"version":"6.17","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/mips/kernel/process.c"]}],"references":["https://git.kernel.org/stable/c/ab18e48a503230d675e824a0d68a108bdff42503","https://git.kernel.org/stable/c/e78033e59444d257d095b73ce5d20625294f6ec2","https://git.kernel.org/stable/c/bd90dbd196831f5c2620736dc221db2634cf1e8e","https://git.kernel.org/stable/c/5b6839b572b503609b9b58bc6c04a816eefa0794","https://git.kernel.org/stable/c/f22de2027b206ddfb8a075800bb5d0dacf2da4b8","https://git.kernel.org/stable/c/82d140f6aab5e89a9d3972697a0dbe1498752d9b","https://git.kernel.org/stable/c/24d098b6f69b0aa806ffcb3e18259bee31650b28","https://git.kernel.org/stable/c/cddf47d20b0325dc8a4e57b833fe96e8f36c42a4","https://git.kernel.org/stable/c/e9f4a6b3421e936c3ee9d74710243897d74dbaa2","https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html","https://cert-portal.siemens.com/productcert/html/ssa-032379.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/38xxx/CVE-2025-38696.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-38696","state":"PUBLISHED","datePublished":"2025-09-04T15:32:48.973Z","dateUpdated":"2026-05-23T16:00:23.673Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T04:51:24.032Z"},"containers":{"cna":{"title":"MIPS: Don't crash in stack_top() for tasks without ABI or vDSO","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nMIPS: Don't crash in stack_top() for tasks without ABI or vDSO\n\nNot all tasks have an ABI associated or vDSO mapped,\nfor example kthreads never do.\nIf such a task ever ends up calling stack_top(), it will derefence the\nNULL ABI pointer and crash.\n\nThis can for example happen when using kunit:\n\n    mips_stack_top+0x28/0xc0\n    arch_pick_mmap_layout+0x190/0x220\n    kunit_vm_mmap_init+0xf8/0x138\n    __kunit_add_resource+0x40/0xa8\n    kunit_vm_mmap+0x88/0xd8\n    usercopy_test_init+0xb8/0x240\n    kunit_try_run_case+0x5c/0x1a8\n    kunit_generic_run_threadfn_adapter+0x28/0x50\n    kthread+0x118/0x240\n    ret_from_kernel_thread+0x14/0x1c\n\nOnly dereference the ABI point if it is set.\n\nThe GIC page is also included as it is specific to the vDSO.\nAlso move the randomization adjustment into the same 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