CVE-2025-39895 (GCVE-0-2025-39895)

Vulnerability from cvelistv5 – Published: 2025-10-01 07:42 – Updated: 2026-05-11 21:38
VLAI
Title
sched: Fix sched_numa_find_nth_cpu() if mask offline
Summary
In the Linux kernel, the following vulnerability has been resolved: sched: Fix sched_numa_find_nth_cpu() if mask offline sched_numa_find_nth_cpu() uses a bsearch to look for the 'closest' CPU in sched_domains_numa_masks and given cpus mask. However they might not intersect if all CPUs in the cpus mask are offline. bsearch will return NULL in that case, bail out instead of dereferencing a bogus pointer. The previous behaviour lead to this bug when using maxcpus=4 on an rk3399 (LLLLbb) (i.e. booting with all big CPUs offline): [ 1.422922] Unable to handle kernel paging request at virtual address ffffff8000000000 [ 1.423635] Mem abort info: [ 1.423889] ESR = 0x0000000096000006 [ 1.424227] EC = 0x25: DABT (current EL), IL = 32 bits [ 1.424715] SET = 0, FnV = 0 [ 1.424995] EA = 0, S1PTW = 0 [ 1.425279] FSC = 0x06: level 2 translation fault [ 1.425735] Data abort info: [ 1.425998] ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000 [ 1.426499] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 1.426952] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 1.427428] swapper pgtable: 4k pages, 39-bit VAs, pgdp=0000000004a9f000 [ 1.428038] [ffffff8000000000] pgd=18000000f7fff403, p4d=18000000f7fff403, pud=18000000f7fff403, pmd=0000000000000000 [ 1.429014] Internal error: Oops: 0000000096000006 [#1] SMP [ 1.429525] Modules linked in: [ 1.429813] CPU: 3 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.17.0-rc4-dirty #343 PREEMPT [ 1.430559] Hardware name: Pine64 RockPro64 v2.1 (DT) [ 1.431012] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 1.431634] pc : sched_numa_find_nth_cpu+0x2a0/0x488 [ 1.432094] lr : sched_numa_find_nth_cpu+0x284/0x488 [ 1.432543] sp : ffffffc084e1b960 [ 1.432843] x29: ffffffc084e1b960 x28: ffffff80078a8800 x27: ffffffc0846eb1d0 [ 1.433495] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000 [ 1.434144] x23: 0000000000000000 x22: fffffffffff7f093 x21: ffffffc081de6378 [ 1.434792] x20: 0000000000000000 x19: 0000000ffff7f093 x18: 00000000ffffffff [ 1.435441] x17: 3030303866666666 x16: 66663d736b73616d x15: ffffffc104e1b5b7 [ 1.436091] x14: 0000000000000000 x13: ffffffc084712860 x12: 0000000000000372 [ 1.436739] x11: 0000000000000126 x10: ffffffc08476a860 x9 : ffffffc084712860 [ 1.437389] x8 : 00000000ffffefff x7 : ffffffc08476a860 x6 : 0000000000000000 [ 1.438036] x5 : 000000000000bff4 x4 : 0000000000000000 x3 : 0000000000000000 [ 1.438683] x2 : 0000000000000000 x1 : ffffffc0846eb000 x0 : ffffff8000407b68 [ 1.439332] Call trace: [ 1.439559] sched_numa_find_nth_cpu+0x2a0/0x488 (P) [ 1.440016] smp_call_function_any+0xc8/0xd0 [ 1.440416] armv8_pmu_init+0x58/0x27c [ 1.440770] armv8_cortex_a72_pmu_init+0x20/0x2c [ 1.441199] arm_pmu_device_probe+0x1e4/0x5e8 [ 1.441603] armv8_pmu_device_probe+0x1c/0x28 [ 1.442007] platform_probe+0x5c/0xac [ 1.442347] really_probe+0xbc/0x298 [ 1.442683] __driver_probe_device+0x78/0x12c [ 1.443087] driver_probe_device+0xdc/0x160 [ 1.443475] __driver_attach+0x94/0x19c [ 1.443833] bus_for_each_dev+0x74/0xd4 [ 1.444190] driver_attach+0x24/0x30 [ 1.444525] bus_add_driver+0xe4/0x208 [ 1.444874] driver_register+0x60/0x128 [ 1.445233] __platform_driver_register+0x24/0x30 [ 1.445662] armv8_pmu_driver_init+0x28/0x4c [ 1.446059] do_one_initcall+0x44/0x25c [ 1.446416] kernel_init_freeable+0x1dc/0x3bc [ 1.446820] kernel_init+0x20/0x1d8 [ 1.447151] ret_from_fork+0x10/0x20 [ 1.447493] Code: 90022e21 f000e5f5 910de2b5 2a1703e2 (f8767803) [ 1.448040] ---[ end trace 0000000000000000 ]--- [ 1.448483] note: swapper/0[1] exited with preempt_count 1 [ 1.449047] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b [ 1.449741] SMP: stopping secondary CPUs [ 1.450105] Kernel Offset: disabled [ 1.450419] CPU features: 0x000000,00080000,20002001,0400421b [ ---truncated---
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 19:28 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6843 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cd7f55359c90a4108e6528e326b8623fce1ad72a , < f9b8d4dba8e78c1887fecd81ba0d8204d6ff05fc (git)
Affected: cd7f55359c90a4108e6528e326b8623fce1ad72a , < b3ec50cc5eb5ca84256ca701d28b137a6036c412 (git)
Affected: cd7f55359c90a4108e6528e326b8623fce1ad72a , < b921c288cd8abef9af5b59e056a63cc2c263a9e3 (git)
Affected: cd7f55359c90a4108e6528e326b8623fce1ad72a , < 5ebf512f335053a42482ebff91e46c6dc156bf8c (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.6.105 , ≤ 6.6.* (semver)
Unaffected: 6.12.46 , ≤ 6.12.* (semver)
Unaffected: 6.16.6 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched: Fix sched_numa_find_nth_cpu() if mask offline\n\nsched_numa_find_nth_cpu() uses a bsearch to look for the \u0027closest\u0027\nCPU in sched_domains_numa_masks and given cpus mask. However they\nmight not intersect if all CPUs in the cpus mask are offline. bsearch\nwill return NULL in that case, bail out instead of dereferencing a\nbogus pointer.\n\nThe previous behaviour lead to this bug when using maxcpus=4 on an\nrk3399 (LLLLbb) (i.e. booting with all big CPUs offline):\n\n[    1.422922] Unable to handle kernel paging request at virtual address ffffff8000000000\n[    1.423635] Mem abort info:\n[    1.423889]   ESR = 0x0000000096000006\n[    1.424227]   EC = 0x25: DABT (current EL), IL = 32 bits\n[    1.424715]   SET = 0, FnV = 0\n[    1.424995]   EA = 0, S1PTW = 0\n[    1.425279]   FSC = 0x06: level 2 translation fault\n[    1.425735] Data abort info:\n[    1.425998]   ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000\n[    1.426499]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n[    1.426952]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n[    1.427428] swapper pgtable: 4k pages, 39-bit VAs, pgdp=0000000004a9f000\n[    1.428038] [ffffff8000000000] pgd=18000000f7fff403, p4d=18000000f7fff403, pud=18000000f7fff403, pmd=0000000000000000\n[    1.429014] Internal error: Oops: 0000000096000006 [#1]  SMP\n[    1.429525] Modules linked in:\n[    1.429813] CPU: 3 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.17.0-rc4-dirty #343 PREEMPT\n[    1.430559] Hardware name: Pine64 RockPro64 v2.1 (DT)\n[    1.431012] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[    1.431634] pc : sched_numa_find_nth_cpu+0x2a0/0x488\n[    1.432094] lr : sched_numa_find_nth_cpu+0x284/0x488\n[    1.432543] sp : ffffffc084e1b960\n[    1.432843] x29: ffffffc084e1b960 x28: ffffff80078a8800 x27: ffffffc0846eb1d0\n[    1.433495] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000\n[    1.434144] x23: 0000000000000000 x22: fffffffffff7f093 x21: ffffffc081de6378\n[    1.434792] x20: 0000000000000000 x19: 0000000ffff7f093 x18: 00000000ffffffff\n[    1.435441] x17: 3030303866666666 x16: 66663d736b73616d x15: ffffffc104e1b5b7\n[    1.436091] x14: 0000000000000000 x13: ffffffc084712860 x12: 0000000000000372\n[    1.436739] x11: 0000000000000126 x10: ffffffc08476a860 x9 : ffffffc084712860\n[    1.437389] x8 : 00000000ffffefff x7 : ffffffc08476a860 x6 : 0000000000000000\n[    1.438036] x5 : 000000000000bff4 x4 : 0000000000000000 x3 : 0000000000000000\n[    1.438683] x2 : 0000000000000000 x1 : ffffffc0846eb000 x0 : ffffff8000407b68\n[    1.439332] Call trace:\n[    1.439559]  sched_numa_find_nth_cpu+0x2a0/0x488 (P)\n[    1.440016]  smp_call_function_any+0xc8/0xd0\n[    1.440416]  armv8_pmu_init+0x58/0x27c\n[    1.440770]  armv8_cortex_a72_pmu_init+0x20/0x2c\n[    1.441199]  arm_pmu_device_probe+0x1e4/0x5e8\n[    1.441603]  armv8_pmu_device_probe+0x1c/0x28\n[    1.442007]  platform_probe+0x5c/0xac\n[    1.442347]  really_probe+0xbc/0x298\n[    1.442683]  __driver_probe_device+0x78/0x12c\n[    1.443087]  driver_probe_device+0xdc/0x160\n[    1.443475]  __driver_attach+0x94/0x19c\n[    1.443833]  bus_for_each_dev+0x74/0xd4\n[    1.444190]  driver_attach+0x24/0x30\n[    1.444525]  bus_add_driver+0xe4/0x208\n[    1.444874]  driver_register+0x60/0x128\n[    1.445233]  __platform_driver_register+0x24/0x30\n[    1.445662]  armv8_pmu_driver_init+0x28/0x4c\n[    1.446059]  do_one_initcall+0x44/0x25c\n[    1.446416]  kernel_init_freeable+0x1dc/0x3bc\n[    1.446820]  kernel_init+0x20/0x1d8\n[    1.447151]  ret_from_fork+0x10/0x20\n[    1.447493] Code: 90022e21 f000e5f5 910de2b5 2a1703e2 (f8767803)\n[    1.448040] ---[ end trace 0000000000000000 ]---\n[    1.448483] note: swapper/0[1] exited with preempt_count 1\n[    1.449047] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b\n[    1.449741] SMP: stopping secondary CPUs\n[    1.450105] Kernel Offset: disabled\n[    1.450419] CPU features: 0x000000,00080000,20002001,0400421b\n[    \n---truncated---"
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                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*",
                    "matchCriteriaId": "340BEEA9-D70D-4290-B502-FBB1032353B1",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched: Fix sched_numa_find_nth_cpu() if mask offline\n\nsched_numa_find_nth_cpu() uses a bsearch to look for the \u0027closest\u0027\nCPU in sched_domains_numa_masks and given cpus mask. However they\nmight not intersect if all CPUs in the cpus mask are offline. bsearch\nwill return NULL in that case, bail out instead of dereferencing a\nbogus pointer.\n\nThe previous behaviour lead to this bug when using maxcpus=4 on an\nrk3399 (LLLLbb) (i.e. booting with all big CPUs offline):\n\n[    1.422922] Unable to handle kernel paging request at virtual address ffffff8000000000\n[    1.423635] Mem abort info:\n[    1.423889]   ESR = 0x0000000096000006\n[    1.424227]   EC = 0x25: DABT (current EL), IL = 32 bits\n[    1.424715]   SET = 0, FnV = 0\n[    1.424995]   EA = 0, S1PTW = 0\n[    1.425279]   FSC = 0x06: level 2 translation fault\n[    1.425735] Data abort info:\n[    1.425998]   ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000\n[    1.426499]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n[    1.426952]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n[    1.427428] swapper pgtable: 4k pages, 39-bit VAs, pgdp=0000000004a9f000\n[    1.428038] [ffffff8000000000] pgd=18000000f7fff403, p4d=18000000f7fff403, pud=18000000f7fff403, pmd=0000000000000000\n[    1.429014] Internal error: Oops: 0000000096000006 [#1]  SMP\n[    1.429525] Modules linked in:\n[    1.429813] CPU: 3 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.17.0-rc4-dirty #343 PREEMPT\n[    1.430559] Hardware name: Pine64 RockPro64 v2.1 (DT)\n[    1.431012] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[    1.431634] pc : sched_numa_find_nth_cpu+0x2a0/0x488\n[    1.432094] lr : sched_numa_find_nth_cpu+0x284/0x488\n[    1.432543] sp : ffffffc084e1b960\n[    1.432843] x29: ffffffc084e1b960 x28: ffffff80078a8800 x27: ffffffc0846eb1d0\n[    1.433495] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000\n[    1.434144] x23: 0000000000000000 x22: fffffffffff7f093 x21: ffffffc081de6378\n[    1.434792] x20: 0000000000000000 x19: 0000000ffff7f093 x18: 00000000ffffffff\n[    1.435441] x17: 3030303866666666 x16: 66663d736b73616d x15: ffffffc104e1b5b7\n[    1.436091] x14: 0000000000000000 x13: ffffffc084712860 x12: 0000000000000372\n[    1.436739] x11: 0000000000000126 x10: ffffffc08476a860 x9 : ffffffc084712860\n[    1.437389] x8 : 00000000ffffefff x7 : ffffffc08476a860 x6 : 0000000000000000\n[    1.438036] x5 : 000000000000bff4 x4 : 0000000000000000 x3 : 0000000000000000\n[    1.438683] x2 : 0000000000000000 x1 : ffffffc0846eb000 x0 : ffffff8000407b68\n[    1.439332] Call trace:\n[    1.439559]  sched_numa_find_nth_cpu+0x2a0/0x488 (P)\n[    1.440016]  smp_call_function_any+0xc8/0xd0\n[    1.440416]  armv8_pmu_init+0x58/0x27c\n[    1.440770]  armv8_cortex_a72_pmu_init+0x20/0x2c\n[    1.441199]  arm_pmu_device_probe+0x1e4/0x5e8\n[    1.441603]  armv8_pmu_device_probe+0x1c/0x28\n[    1.442007]  platform_probe+0x5c/0xac\n[    1.442347]  really_probe+0xbc/0x298\n[    1.442683]  __driver_probe_device+0x78/0x12c\n[    1.443087]  driver_probe_device+0xdc/0x160\n[    1.443475]  __driver_attach+0x94/0x19c\n[    1.443833]  bus_for_each_dev+0x74/0xd4\n[    1.444190]  driver_attach+0x24/0x30\n[    1.444525]  bus_add_driver+0xe4/0x208\n[    1.444874]  driver_register+0x60/0x128\n[    1.445233]  __platform_driver_register+0x24/0x30\n[    1.445662]  armv8_pmu_driver_init+0x28/0x4c\n[    1.446059]  do_one_initcall+0x44/0x25c\n[    1.446416]  kernel_init_freeable+0x1dc/0x3bc\n[    1.446820]  kernel_init+0x20/0x1d8\n[    1.447151]  ret_from_fork+0x10/0x20\n[    1.447493] Code: 90022e21 f000e5f5 910de2b5 2a1703e2 (f8767803)\n[    1.448040] ---[ end trace 0000000000000000 ]---\n[    1.448483] note: swapper/0[1] exited with preempt_count 1\n[    1.449047] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b\n[    1.449741] SMP: stopping secondary CPUs\n[    1.450105] Kernel Offset: disabled\n[    1.450419] CPU features: 0x000000,00080000,20002001,0400421b\n[    \n---truncated---"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsched: Corregir sched_numa_find_nth_cpu() si la m\u00e1scara est\u00e1 fuera de l\u00ednea\n\nsched_numa_find_nth_cpu() usa una b\u00fasqueda binaria para buscar la CPU \u0027m\u00e1s cercana\u0027 en sched_domains_numa_masks y la m\u00e1scara de CPUs dada. Sin embargo, podr\u00edan no intersecarse si todas las CPUs en la m\u00e1scara de CPUs est\u00e1n fuera de l\u00ednea. La b\u00fasqueda binaria devolver\u00e1 NULL en ese caso, salir en lugar de desreferenciar un puntero err\u00f3neo.\n\nEl comportamiento anterior llev\u00f3 a este error al usar maxcpus=4 en un rk3399 (LLLLbb) (es decir, arrancando con todas las CPUs grandes fuera de l\u00ednea):\n\n[    1.422922] No se puede manejar la solicitud de paginaci\u00f3n del kernel en la direcci\u00f3n virtual ffffff8000000000\n[    1.423635] Informaci\u00f3n de aborto de memoria:\n[    1.423889]   ESR = 0x0000000096000006\n[    1.424227]   EC = 0x25: DABT (current EL), IL = 32 bits\n[    1.424715]   SET = 0, FnV = 0\n[    1.424995]   EA = 0, S1PTW = 0\n[    1.425279]   FSC = 0x06: level 2 translation fault\n[    1.425735] Data abort info:\n[    1.425998]   ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000\n[    1.426499]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n[    1.426952]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n[    1.427428] swapper pgtable: 4k pages, 39-bit VAs, pgdp=0000000004a9f000\n[    1.428038] [ffffff8000000000] pgd=18000000f7fff403, p4d=18000000f7fff403, pud=18000000f7fff403, pmd=0000000000000000\n[    1.429014] Error interno: Oops: 0000000096000006 [#1]  SMP\n[    1.429525] M\u00f3dulos enlazados:\n[    1.429813] CPU: 3 UID: 0 PID: 1 Comm: swapper/0 No contaminado 6.17.0-rc4-dirty #343 PREEMPT\n[    1.430559] Nombre del hardware: Pine64 RockPro64 v2.1 (DT)\n[    1.431012] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[    1.431634] pc : sched_numa_find_nth_cpu+0x2a0/0x488\n[    1.432094] lr : sched_numa_find_nth_cpu+0x284/0x488\n[    1.432543] sp : ffffffc084e1b960\n[    1.432843] x29: ffffffc084e1b960 x28: ffffff80078a8800 x27: ffffffc0846eb1d0\n[    1.433495] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000\n[    1.434144] x23: 0000000000000000 x22: fffffffffff7f093 x21: ffffffc081de6378\n[    1.434792] x2"
          }
        ],
        "id": "CVE-2025-39895",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
          "cvssMetricV31": [
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              "cvssData": {
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                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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              "impactScore": 3.6,
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "type": "Secondary"
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                "role": "CISA Coordinator",
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        "published": "2025-10-01T08:15:32.110",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
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                "lang": "en",
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            "type": "Secondary"
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    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:21:46+00:00",
      "cve": "CVE-2025-39895",
      "id": "CVE-2025-39895",
      "initial_release_date": "2025-10-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sched: Fix sched_numa_find_nth_cpu() if mask offline",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39895.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
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                  "content": {
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                    "options": [
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                        "Automatable": "no"
                      },
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            "problemTypes": [
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                    "description": "CWE-476 NULL Pointer Dereference",
                    "lang": "en",
                    "type": "CWE"
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                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-01-14T19:28:03.379Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "versions": [
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              ]
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
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                  "version": "6.3"
                },
                {
                  "lessThan": "6.3",
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                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
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                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
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                  "lessThanOrEqual": "6.16.*",
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                  "versionType": "semver"
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                  "lessThanOrEqual": "*",
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                  "versionType": "original_commit_for_fix"
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              ]
            }
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          "cpeApplicability": [
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              "nodes": [
                {
                  "cpeMatch": [
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                      "versionEndExcluding": "6.6.105",
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            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched: Fix sched_numa_find_nth_cpu() if mask offline\n\nsched_numa_find_nth_cpu() uses a bsearch to look for the \u0027closest\u0027\nCPU in sched_domains_numa_masks and given cpus mask. However they\nmight not intersect if all CPUs in the cpus mask are offline. bsearch\nwill return NULL in that case, bail out instead of dereferencing a\nbogus pointer.\n\nThe previous behaviour lead to this bug when using maxcpus=4 on an\nrk3399 (LLLLbb) (i.e. booting with all big CPUs offline):\n\n[    1.422922] Unable to handle kernel paging request at virtual address ffffff8000000000\n[    1.423635] Mem abort info:\n[    1.423889]   ESR = 0x0000000096000006\n[    1.424227]   EC = 0x25: DABT (current EL), IL = 32 bits\n[    1.424715]   SET = 0, FnV = 0\n[    1.424995]   EA = 0, S1PTW = 0\n[    1.425279]   FSC = 0x06: level 2 translation fault\n[    1.425735] Data abort info:\n[    1.425998]   ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000\n[    1.426499]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n[    1.426952]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n[    1.427428] swapper pgtable: 4k pages, 39-bit VAs, pgdp=0000000004a9f000\n[    1.428038] [ffffff8000000000] pgd=18000000f7fff403, p4d=18000000f7fff403, pud=18000000f7fff403, pmd=0000000000000000\n[    1.429014] Internal error: Oops: 0000000096000006 [#1]  SMP\n[    1.429525] Modules linked in:\n[    1.429813] CPU: 3 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.17.0-rc4-dirty #343 PREEMPT\n[    1.430559] Hardware name: Pine64 RockPro64 v2.1 (DT)\n[    1.431012] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[    1.431634] pc : sched_numa_find_nth_cpu+0x2a0/0x488\n[    1.432094] lr : sched_numa_find_nth_cpu+0x284/0x488\n[    1.432543] sp : ffffffc084e1b960\n[    1.432843] x29: ffffffc084e1b960 x28: ffffff80078a8800 x27: ffffffc0846eb1d0\n[    1.433495] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000\n[    1.434144] x23: 0000000000000000 x22: fffffffffff7f093 x21: ffffffc081de6378\n[    1.434792] x20: 0000000000000000 x19: 0000000ffff7f093 x18: 00000000ffffffff\n[    1.435441] x17: 3030303866666666 x16: 66663d736b73616d x15: ffffffc104e1b5b7\n[    1.436091] x14: 0000000000000000 x13: ffffffc084712860 x12: 0000000000000372\n[    1.436739] x11: 0000000000000126 x10: ffffffc08476a860 x9 : ffffffc084712860\n[    1.437389] x8 : 00000000ffffefff x7 : ffffffc08476a860 x6 : 0000000000000000\n[    1.438036] x5 : 000000000000bff4 x4 : 0000000000000000 x3 : 0000000000000000\n[    1.438683] x2 : 0000000000000000 x1 : ffffffc0846eb000 x0 : ffffff8000407b68\n[    1.439332] Call trace:\n[    1.439559]  sched_numa_find_nth_cpu+0x2a0/0x488 (P)\n[    1.440016]  smp_call_function_any+0xc8/0xd0\n[    1.440416]  armv8_pmu_init+0x58/0x27c\n[    1.440770]  armv8_cortex_a72_pmu_init+0x20/0x2c\n[    1.441199]  arm_pmu_device_probe+0x1e4/0x5e8\n[    1.441603]  armv8_pmu_device_probe+0x1c/0x28\n[    1.442007]  platform_probe+0x5c/0xac\n[    1.442347]  really_probe+0xbc/0x298\n[    1.442683]  __driver_probe_device+0x78/0x12c\n[    1.443087]  driver_probe_device+0xdc/0x160\n[    1.443475]  __driver_attach+0x94/0x19c\n[    1.443833]  bus_for_each_dev+0x74/0xd4\n[    1.444190]  driver_attach+0x24/0x30\n[    1.444525]  bus_add_driver+0xe4/0x208\n[    1.444874]  driver_register+0x60/0x128\n[    1.445233]  __platform_driver_register+0x24/0x30\n[    1.445662]  armv8_pmu_driver_init+0x28/0x4c\n[    1.446059]  do_one_initcall+0x44/0x25c\n[    1.446416]  kernel_init_freeable+0x1dc/0x3bc\n[    1.446820]  kernel_init+0x20/0x1d8\n[    1.447151]  ret_from_fork+0x10/0x20\n[    1.447493] Code: 90022e21 f000e5f5 910de2b5 2a1703e2 (f8767803)\n[    1.448040] ---[ end trace 0000000000000000 ]---\n[    1.448483] note: swapper/0[1] exited with preempt_count 1\n[    1.449047] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b\n[    1.449741] SMP: stopping secondary CPUs\n[    1.450105] Kernel Offset: disabled\n[    1.450419] CPU features: 0x000000,00080000,20002001,0400421b\n[    \n---truncated---"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-10-01T07:42:43.920Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/f9b8d4dba8e78c1887fecd81ba0d8204d6ff05fc"
            },
            {
              "url": "https://git.kernel.org/stable/c/b3ec50cc5eb5ca84256ca701d28b137a6036c412"
            },
            {
              "url": "https://git.kernel.org/stable/c/b921c288cd8abef9af5b59e056a63cc2c263a9e3"
            },
            {
              "url": "https://git.kernel.org/stable/c/5ebf512f335053a42482ebff91e46c6dc156bf8c"
            }
          ],
          "title": "sched: Fix sched_numa_find_nth_cpu() if mask offline",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-39895",
        "datePublished": "2025-10-01T07:42:43.920Z",
        "dateReserved": "2025-04-16T07:20:57.146Z",
        "dateUpdated": "2026-01-14T19:33:13.717Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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