CVE-2025-40042
Estado: AplazadaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
tracing: Fix race condition in kprobe initialization causing NULL pointer dereference
There is a critical race condition in kprobe initialization that can lead to NULL pointer dereference and kernel crash.
kernel/trace/trace_kprobe.c: 1308 0xffff3df8995039ec <kprobe_perf_func+0x2c>: ldr x21, [x24,#120] include/linux/compiler.h: 294 0xffff3df8995039f0 <kprobe_perf_func+0x30>: ldr x1, [x21,x0]
Race Condition Analysis:
The race occurs between kprobe activation and perf_events initialization:
Problem: 1. CPU0 executes (1) assigning tp_event->perf_events = list 2. CPU0 executes (2) enabling kprobe functionality via class->reg() 3. CPU1 triggers and reaches kprobe_dispatcher 4.
Leer descripción completaMostrar menos
CPU1 checks TP_FLAG_PROFILE - condition passes (step 2 completed) 5. CPU1 calls kprobe_perf_func() and crashes at (3) because call->perf_events is still NULL
CPU1 sees that kprobe functionality is enabled but does not see that perf_events has been assigned.
Add pairing read an ---truncated---
Detalles técnicos trazas, registros y código del informe original
[1135630.084782] Unable to handle kernel paging request at virtual address 0000710a04630000
...
[1135630.260314] pstate: 404003c9 (nZcv DAIF +PAN -UAO)
[1135630.269239] pc : kprobe_perf_func+0x30/0x260
[1135630.277643] lr : kprobe_dispatcher+0x44/0x60
[1135630.286041] sp : ffffaeff4977fa40
[1135630.293441] x29: ffffaeff4977fa40 x28: ffffaf015340e400
[1135630.302837] x27: 0000000000000000 x26: 0000000000000000
[1135630.312257] x25: ffffaf029ed108a8 x24: ffffaf015340e528
[1135630.321705] x23: ffffaeff4977fc50 x22: ffffaeff4977fc50
[1135630.331154] x21: 0000000000000000 x20: ffffaeff4977fc50
[1135630.340586] x19: ffffaf015340e400 x18: 0000000000000000
[1135630.349985] x17: 0000000000000000 x16: 0000000000000000
[1135630.359285] x15: 0000000000000000 x14: 0000000000000000
[1135630.368445] x13: 0000000000000000 x12: 0000000000000000
[1135630.377473] x11: 0000000000000000 x10: 0000000000000000
[1135630.386411] x9 : 0000000000000000 x8 : 0000000000000000
[1135630.395252] x7 : 0000000000000000 x6 : 0000000000000000
[1135630.403963] x5 : 0000000000000000 x4 : 0000000000000000
[1135630.412545] x3 : 0000710a04630000 x2 : 0000000000000006
[1135630.421021] x1 : ffffaeff4977fc50 x0 : 0000710a04630000
[1135630.429410] Call trace:
[1135630.434828] kprobe_perf_func+0x30/0x260
[1135630.441661] kprobe_dispatcher+0x44/0x60
[1135630.448396] aggr_pre_handler+0x70/0xc8
[1135630.454959] kprobe_breakpoint_handler+0x140/0x1e0
[1135630.462435] brk_handler+0xbc/0xd8
[1135630.468437] do_debug_exception+0x84/0x138
[1135630.475074] el1_dbg+0x18/0x8c
[1135630.480582] security_file_permission+0x0/0xd0
[1135630.487426] vfs_write+0x70/0x1c0
[1135630.493059] ksys_write+0x5c/0xc8
[1135630.498638] __arm64_sys_write+0x24/0x30
[1135630.504821] el0_svc_common+0x78/0x130
[1135630.510838] el0_svc_handler+0x38/0x78
[1135630.516834] el0_svc+0x8/0x1b0
kernel/trace/trace_kprobe.c
1308: head = this_cpu_ptr(call->perf_events);
1309: if (hlist_empty(head))
1310: return 0;
crash> struct trace_event_call -o
struct trace_event_call {
...
[120] struct hlist_head *perf_events; //(call->perf_event)
...
}
crash> struct trace_event_call ffffaf015340e528
struct trace_event_call {
...
perf_events = 0xffff0ad5fa89f088, //this value is correct, but x21 = 0
...
}
CPU0 CPU1
==== ====
perf_kprobe_init
perf_trace_event_init
tp_event->perf_events = list;(1)
tp_event->class->reg (2)← KPROBE ACTIVE
Debug exception triggers
...
kprobe_dispatcher
kprobe_perf_func (tk->tp.flags & TP_FLAG_PROFILE)
head = this_cpu_ptr(call->perf_events)(3)
(perf_events is still NULL)CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.23%
- Percentil entre todas las CVEs puntuadas: 12
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/07926ce598a95de6fd874a74fb510e2ebdfd0aae
- https://git.kernel.org/stable/c/0fa388ab2c290ef1115ff88ae88e881d0fb2db02
- https://git.kernel.org/stable/c/1a301228c0a8aedc3154fb1a274456f487416b96
- https://git.kernel.org/stable/c/5ebea6561649d30ec7a18fea23d7f76738dae916
- https://git.kernel.org/stable/c/95dd33361061f808d1f68616d69ada639e737cfa
- https://git.kernel.org/stable/c/9c4951b691bb8d7a004acd010f45144391f85ea6
- https://git.kernel.org/stable/c/9cf9aa7b0acfde7545c1a1d912576e9bab28dc6f
- https://git.kernel.org/stable/c/a6e89ada1ff6b70df73f579071ffa6ade8ae7f98
JSON original (NVD)
Mostrar
{
"id": "CVE-2025-40042",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "50d780560785b068c358675c5f0bf6c83b5c373e",
"lessThan": "07926ce598a95de6fd874a74fb510e2ebdfd0aae",
"versionType": "git"
},
{
"status": "affected",
"version": "50d780560785b068c358675c5f0bf6c83b5c373e",
"lessThan": "9c4951b691bb8d7a004acd010f45144391f85ea6",
"versionType": "git"
},
{
"status": "affected",
"version": "50d780560785b068c358675c5f0bf6c83b5c373e",
"lessThan": "95dd33361061f808d1f68616d69ada639e737cfa",
"versionType": "git"
},
{
"status": "affected",
"version": "50d780560785b068c358675c5f0bf6c83b5c373e",
"lessThan": "a6e89ada1ff6b70df73f579071ffa6ade8ae7f98",
"versionType": "git"
},
{
"status": "affected",
"version": "50d780560785b068c358675c5f0bf6c83b5c373e",
"lessThan": "1a301228c0a8aedc3154fb1a274456f487416b96",
"versionType": "git"
},
{
"status": "affected",
"version": "50d780560785b068c358675c5f0bf6c83b5c373e",
"lessThan": "0fa388ab2c290ef1115ff88ae88e881d0fb2db02",
"versionType": "git"
},
{
"status": "affected",
"version": "50d780560785b068c358675c5f0bf6c83b5c373e",
"lessThan": "5ebea6561649d30ec7a18fea23d7f76738dae916",
"versionType": "git"
},
{
"status": "affected",
"version": "50d780560785b068c358675c5f0bf6c83b5c373e",
"lessThan": "9cf9aa7b0acfde7545c1a1d912576e9bab28dc6f",
"versionType": "git"
}
],
"programFiles": [
"kernel/trace/trace_fprobe.c",
"kernel/trace/trace_kprobe.c",
"kernel/trace/trace_probe.h",
"kernel/trace/trace_uprobe.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.33"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.33",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.301",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.246",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.195",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.157",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.113",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.54",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.17.3",
"versionType": "semver",
"lessThanOrEqual": "6.17.*"
},
{
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/trace/trace_fprobe.c",
"kernel/trace/trace_kprobe.c",
"kernel/trace/trace_probe.h",
"kernel/trace/trace_uprobe.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-10-28T12:15:38.207",
"references": [
{
"url": "https://git.kernel.org/stable/c/07926ce598a95de6fd874a74fb510e2ebdfd0aae",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/0fa388ab2c290ef1115ff88ae88e881d0fb2db02",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/1a301228c0a8aedc3154fb1a274456f487416b96",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/5ebea6561649d30ec7a18fea23d7f76738dae916",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/95dd33361061f808d1f68616d69ada639e737cfa",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9c4951b691bb8d7a004acd010f45144391f85ea6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9cf9aa7b0acfde7545c1a1d912576e9bab28dc6f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a6e89ada1ff6b70df73f579071ffa6ade8ae7f98",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix race condition in kprobe initialization causing NULL pointer dereference\n\nThere is a critical race condition in kprobe initialization that can lead to\nNULL pointer dereference and kernel crash.\n\n[1135630.084782] Unable to handle kernel paging request at virtual address 0000710a04630000\n...\n[1135630.260314] pstate: 404003c9 (nZcv DAIF +PAN -UAO)\n[1135630.269239] pc : kprobe_perf_func+0x30/0x260\n[1135630.277643] lr : kprobe_dispatcher+0x44/0x60\n[1135630.286041] sp : ffffaeff4977fa40\n[1135630.293441] x29: ffffaeff4977fa40 x28: ffffaf015340e400\n[1135630.302837] x27: 0000000000000000 x26: 0000000000000000\n[1135630.312257] x25: ffffaf029ed108a8 x24: ffffaf015340e528\n[1135630.321705] x23: ffffaeff4977fc50 x22: ffffaeff4977fc50\n[1135630.331154] x21: 0000000000000000 x20: ffffaeff4977fc50\n[1135630.340586] x19: ffffaf015340e400 x18: 0000000000000000\n[1135630.349985] x17: 0000000000000000 x16: 0000000000000000\n[1135630.359285] x15: 0000000000000000 x14: 0000000000000000\n[1135630.368445] x13: 0000000000000000 x12: 0000000000000000\n[1135630.377473] x11: 0000000000000000 x10: 0000000000000000\n[1135630.386411] x9 : 0000000000000000 x8 : 0000000000000000\n[1135630.395252] x7 : 0000000000000000 x6 : 0000000000000000\n[1135630.403963] x5 : 0000000000000000 x4 : 0000000000000000\n[1135630.412545] x3 : 0000710a04630000 x2 : 0000000000000006\n[1135630.421021] x1 : ffffaeff4977fc50 x0 : 0000710a04630000\n[1135630.429410] Call trace:\n[1135630.434828] kprobe_perf_func+0x30/0x260\n[1135630.441661] kprobe_dispatcher+0x44/0x60\n[1135630.448396] aggr_pre_handler+0x70/0xc8\n[1135630.454959] kprobe_breakpoint_handler+0x140/0x1e0\n[1135630.462435] brk_handler+0xbc/0xd8\n[1135630.468437] do_debug_exception+0x84/0x138\n[1135630.475074] el1_dbg+0x18/0x8c\n[1135630.480582] security_file_permission+0x0/0xd0\n[1135630.487426] vfs_write+0x70/0x1c0\n[1135630.493059] ksys_write+0x5c/0xc8\n[1135630.498638] __arm64_sys_write+0x24/0x30\n[1135630.504821] el0_svc_common+0x78/0x130\n[1135630.510838] el0_svc_handler+0x38/0x78\n[1135630.516834] el0_svc+0x8/0x1b0\n\nkernel/trace/trace_kprobe.c: 1308\n0xffff3df8995039ec <kprobe_perf_func+0x2c>: ldr x21, [x24,#120]\ninclude/linux/compiler.h: 294\n0xffff3df8995039f0 <kprobe_perf_func+0x30>: ldr x1, [x21,x0]\n\nkernel/trace/trace_kprobe.c\n1308: head = this_cpu_ptr(call->perf_events);\n1309: if (hlist_empty(head))\n1310: \treturn 0;\n\ncrash> struct trace_event_call -o\nstruct trace_event_call {\n ...\n [120] struct hlist_head *perf_events; //(call->perf_event)\n ...\n}\n\ncrash> struct trace_event_call ffffaf015340e528\nstruct trace_event_call {\n ...\n perf_events = 0xffff0ad5fa89f088, //this value is correct, but x21 = 0\n ...\n}\n\nRace Condition Analysis:\n\nThe race occurs between kprobe activation and perf_events initialization:\n\n CPU0 CPU1\n ==== ====\n perf_kprobe_init\n perf_trace_event_init\n tp_event->perf_events = list;(1)\n tp_event->class->reg (2)← KPROBE ACTIVE\n Debug exception triggers\n ...\n kprobe_dispatcher\n kprobe_perf_func (tk->tp.flags & TP_FLAG_PROFILE)\n head = this_cpu_ptr(call->perf_events)(3)\n (perf_events is still NULL)\n\nProblem:\n1. CPU0 executes (1) assigning tp_event->perf_events = list\n2. CPU0 executes (2) enabling kprobe functionality via class->reg()\n3. CPU1 triggers and reaches kprobe_dispatcher\n4. CPU1 checks TP_FLAG_PROFILE - condition passes (step 2 completed)\n5. CPU1 calls kprobe_perf_func() and crashes at (3) because\n call->perf_events is still NULL\n\nCPU1 sees that kprobe functionality is enabled but does not see that\nperf_events has been assigned.\n\nAdd pairing read an\n---truncated---"
}
],
"lastModified": "2026-06-17T09:21:10.167",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}