{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99093", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.390Z", "datePublished": "2026-10-26T14:52:01.450Z", "dateUpdated": "2026-10-26T14:52:01.450Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-26T14:52:01.450Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: don't schedule deferred kernel page table freeing while booting\n\nBooting with a boot-time function tracer and a filter, for example\n\n ftrace=function ftrace_filter=pud_free_pmd_page\n\npanics on 7.3-rc4 as soon as the tracer starts:\n\n [ 23.531178] Starting tracer 'function'\n [ 23.675800] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN NOPTI\n [ 23.819917] KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7]\n [ 23.964025] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 7.3.0-rc4-fe2ec83746e5-with-fixes-v2+ #195 PREEMPT(undef)\n [ 24.252248] RIP: 0010:__queue_work+0xab/0xf00\n [ 25.981629] Call Trace:\n [ 26.125727] <TASK>\n [ 26.413912] ? pagetable_free_kernel+0x20/0x120\n [ 26.990283] queue_work_on+0x97/0xf0\n [ 27.134382] __cpa_collapse_large_pages+0x501/0x6f0\n [ 27.566662] cpa_flush+0x394/0x620\n [ 27.998953] change_page_attr_set_clr+0x321/0x4a0\n [ 29.151729] set_memory_rox+0xa2/0xf0\n [ 29.584018] create_trampoline+0x431/0x6f0\n ...\n [ 44.343347] Kernel panic - not syncing: Attempted to kill the idle task!\n\nThe boot-time tracer is started from early_trace_init(), which runs\nbefore workqueue_init_early(). Making its trampoline read-only splits a\nlarge page, and CPA collapses it again right away. The split table has\nbeen a kernel page table since commit 9e4a3ec3411b\n(\"x86/mm/pat: Allocate split page tables as kernel page tables\"), so the\ncollapse frees it through pagetable_free_kernel(), which queues work on\nsystem_percpu_wq - still NULL at that point. That commit is correct in\nitself; it only lets CPA reach pagetable_free_kernel() before the\nworkqueue that function relies on exists.\n\nKeep putting the table on the list, but don't schedule the work while\nthe system is still booting. A core_initcall schedules it once to free\nwhatever was queued by then."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/pgtable-generic.c"], "versions": [{"version": "84e0cd79d57f06b872154eb5d8f610584133f260", "lessThan": "7a25ca170c12a9328f6fcf4410713beb516b01c0", "status": "affected", "versionType": "git"}, {"version": "922873cf4fc34124215070a8ad391bf831538bb9", "lessThan": "df6c704a08bc0925d5db047b0a6221f962bda4d9", "status": "affected", "versionType": "git"}, {"version": "9e4a3ec3411bb6bb59e3c1f29b75609f1e87aac4", "lessThan": "2fb552b0bee70c24c092720028ab4620f5eb2646", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/pgtable-generic.c"], "versions": [{"version": "6.18.53", "lessThan": "6.18.57", "status": "affected", "versionType": "semver"}, {"version": "7.2.7", "lessThan": "7.2.11", "status": "affected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.53", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.2.7", "versionEndExcluding": "7.2.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7a25ca170c12a9328f6fcf4410713beb516b01c0"}, {"url": "https://git.kernel.org/stable/c/df6c704a08bc0925d5db047b0a6221f962bda4d9"}, {"url": "https://git.kernel.org/stable/c/2fb552b0bee70c24c092720028ab4620f5eb2646"}], "title": "mm: don't schedule deferred kernel page table freeing while booting", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["mm/pgtable-generic.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "7a25ca170c12a9328f6fcf4410713beb516b01c0", "status": "affected", "version": "84e0cd79d57f06b872154eb5d8f610584133f260", "versionType": "git"}, {"lessThan": "df6c704a08bc0925d5db047b0a6221f962bda4d9", "status": "affected", "version": "922873cf4fc34124215070a8ad391bf831538bb9", "versionType": "git"}, {"lessThan": "2fb552b0bee70c24c092720028ab4620f5eb2646", "status": "affected", "version": "9e4a3ec3411bb6bb59e3c1f29b75609f1e87aac4", "versionType": "git"}]}, {"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["mm/pgtable-generic.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "6.18.57", "status": "affected", "version": "6.18.53", "versionType": "semver"}, {"lessThan": "7.2.11", "status": "affected", "version": "7.2.7", "versionType": "semver"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: don't schedule deferred kernel page table freeing while booting\n\nBooting with a boot-time function tracer and a filter, for example\n\n ftrace=function ftrace_filter=pud_free_pmd_page\n\npanics on 7.3-rc4 as soon as the tracer starts:\n\n [ 23.531178] Starting tracer 'function'\n [ 23.675800] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN NOPTI\n [ 23.819917] KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7]\n [ 23.964025] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 7.3.0-rc4-fe2ec83746e5-with-fixes-v2+ #195 PREEMPT(undef)\n [ 24.252248] RIP: 0010:__queue_work+0xab/0xf00\n [ 25.981629] Call Trace:\n [ 26.125727] <TASK>\n [ 26.413912] ? pagetable_free_kernel+0x20/0x120\n [ 26.990283] queue_work_on+0x97/0xf0\n [ 27.134382] __cpa_collapse_large_pages+0x501/0x6f0\n [ 27.566662] cpa_flush+0x394/0x620\n [ 27.998953] change_page_attr_set_clr+0x321/0x4a0\n [ 29.151729] set_memory_rox+0xa2/0xf0\n [ 29.584018] create_trampoline+0x431/0x6f0\n ...\n [ 44.343347] Kernel panic - not syncing: Attempted to kill the idle task!\n\nThe boot-time tracer is started from early_trace_init(), which runs\nbefore workqueue_init_early(). Making its trampoline read-only splits a\nlarge page, and CPA collapses it again right away. The split table has\nbeen a kernel page table since commit 9e4a3ec3411b\n(\"x86/mm/pat: Allocate split page tables as kernel page tables\"), so the\ncollapse frees it through pagetable_free_kernel(), which queues work on\nsystem_percpu_wq - still NULL at that point. That commit is correct in\nitself; it only lets CPA reach pagetable_free_kernel() before the\nworkqueue that function relies on exists.\n\nKeep putting the table on the list, but don't schedule the work while\nthe system is still booting. A core_initcall schedules it once to free\nwhatever was queued by then."}], "id": "CVE-2026-99093", "lastModified": "2026-10-26T15:16:48.253", "metrics": {}, "published": "2026-10-26T15:16:48.253", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2fb552b0bee70c24c092720028ab4620f5eb2646"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7a25ca170c12a9328f6fcf4410713beb516b01c0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/df6c704a08bc0925d5db047b0a6221f962bda4d9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[84e0cd79d57f06b872154eb5d8f610584133f260,7a25ca170c12a9328f6fcf4410713beb516b01c0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[922873cf4fc34124215070a8ad391bf831538bb9,df6c704a08bc0925d5db047b0a6221f962bda4d9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9e4a3ec3411bb6bb59e3c1f29b75609f1e87aac4,2fb552b0bee70c24c092720028ab4620f5eb2646)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.53,6.18.57)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[7.2.7,7.2.11)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[84e0cd79d57f06b872154eb5d8f610584133f260,7a25ca170c12a9328f6fcf4410713beb516b01c0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[922873cf4fc34124215070a8ad391bf831538bb9,df6c704a08bc0925d5db047b0a6221f962bda4d9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9e4a3ec3411bb6bb59e3c1f29b75609f1e87aac4,2fb552b0bee70c24c092720028ab4620f5eb2646)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.53,6.18.57)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[7.2.7,7.2.11)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-26T16:45:14.918090+00:00", "updated": "2026-10-26T17:30:15.923350+00:00", "vendors": ["linux", "linux$PRODUCT$linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-476"]}