CVE-2021-47274 (GCVE-0-2021-47274)
Vulnerability from cvelistv5 – Published: 2024-05-21 14:20 – Updated: 2026-08-05 08:47
VLAI
EPSS
VEX
Title
tracing: Correct the length check which causes memory corruption
Summary
In the Linux kernel, the following vulnerability has been resolved:
tracing: Correct the length check which causes memory corruption
We've suffered from severe kernel crashes due to memory corruption on
our production environment, like,
Call Trace:
[1640542.554277] general protection fault: 0000 [#1] SMP PTI
[1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: loaded Tainted:G
[1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190
[1640542.559074] RSP: 0018:ffffb16faa597df8 EFLAGS: 00010286
[1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX:
0000000006e931bf
[1640542.560323] RDX: 0000000006e931be RSI: 0000000000400200 RDI:
ffff9a45ff004300
[1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09:
0000000000000000
[1640542.561670] R10: 0000000000000000 R11: 0000000000000000 R12:
ffffffff9a20608d
[1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15:
696c662f65636976
[1640542.563128] FS: 00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000)
knlGS:0000000000000000
[1640542.563937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4:
00000000003606e0
[1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[1640542.566069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[1640542.566742] Call Trace:
[1640542.567009] anon_vma_clone+0x5d/0x170
[1640542.567417] __split_vma+0x91/0x1a0
[1640542.567777] do_munmap+0x2c6/0x320
[1640542.568128] vm_munmap+0x54/0x70
[1640542.569990] __x64_sys_munmap+0x22/0x30
[1640542.572005] do_syscall_64+0x5b/0x1b0
[1640542.573724] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[1640542.575642] RIP: 0033:0x7f45d6e61e27
James Wang has reproduced it stably on the latest 4.19 LTS.
After some debugging, we finally proved that it's due to ftrace
buffer out-of-bound access using a debug tool as follows:
[ 86.775200] BUG: Out-of-bounds write at addr 0xffff88aefe8b7000
[ 86.780806] no_context+0xdf/0x3c0
[ 86.784327] __do_page_fault+0x252/0x470
[ 86.788367] do_page_fault+0x32/0x140
[ 86.792145] page_fault+0x1e/0x30
[ 86.795576] strncpy_from_unsafe+0x66/0xb0
[ 86.799789] fetch_memory_string+0x25/0x40
[ 86.804002] fetch_deref_string+0x51/0x60
[ 86.808134] kprobe_trace_func+0x32d/0x3a0
[ 86.812347] kprobe_dispatcher+0x45/0x50
[ 86.816385] kprobe_ftrace_handler+0x90/0xf0
[ 86.820779] ftrace_ops_assist_func+0xa1/0x140
[ 86.825340] 0xffffffffc00750bf
[ 86.828603] do_sys_open+0x5/0x1f0
[ 86.832124] do_syscall_64+0x5b/0x1b0
[ 86.835900] entry_SYSCALL_64_after_hwframe+0x44/0xa9
commit b220c049d519 ("tracing: Check length before giving out
the filter buffer") adds length check to protect trace data
overflow introduced in 0fc1b09ff1ff, seems that this fix can't prevent
overflow entirely, the length check should also take the sizeof
entry->array[0] into account, since this array[0] is filled the
length of trace data and occupy addtional space and risk overflow.
Severity
7.8 (High)
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-06 18:18 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
7 references
Impacted products
18 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
2e584b1a02eeb860e286d39bc408b25ebc5ec844 , < edcce01e0e50840a9aa6a70baed21477bdd2c9f9
(git)
Affected: e46d433754420b4d6513ca389403de88a0910279 , < 2d598902799886d67947406f26ee8e5fd2ca097f (git) Affected: 0572fc6a510add9029b113239eaabf4b5bce8ec9 , < 31ceae385556c37e4d286cb6378696448f566883 (git) Affected: a0997a86f5c0085e183ddee5fb72091d584d3d16 , < d63f00ec908b3be635ead5d6029cc94246e1f38d (git) Affected: 7c93d8cff582c459350d6f8906eea6e4cd60d959 , < 43c32c22254b9328d7abb1c2b0f689dc67838e60 (git) Affected: b220c049d5196dd94d992dd2dc8cba1a5e6123bf , < b16a249eca2230c2cd66fa1d4b94743bd9b6ef92 (git) Affected: b220c049d5196dd94d992dd2dc8cba1a5e6123bf , < 3e08a9f9760f4a70d633c328a76408e62d6f80a3 (git) Affected: 4.9.258 , < 4.9.273 (semver) Affected: 4.14.222 , < 4.14.237 (semver) Affected: 4.19.177 , < 4.19.195 (semver) Affected: 5.4.99 , < 5.4.126 (semver) Affected: 5.10.17 , < 5.10.44 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.11
Unaffected: 0 , < 5.11 (semver) Unaffected: 4.9.273 , ≤ 4.9.* (semver) Unaffected: 4.14.237 , ≤ 4.14.* (semver) Unaffected: 4.19.195 , ≤ 4.19.* (semver) Unaffected: 5.4.126 , ≤ 5.4.* (semver) Unaffected: 5.10.44 , ≤ 5.10.* (semver) Unaffected: 5.12.11 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix) |
guessed | |
| linux | linux_kernel |
Affected:
2e584b1a02ee , < edcce01e0e50
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
e46d43375442 , < 2d5989027998
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
0572fc6a510a , < 31ceae385556
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
a0997a86f5c0 , < d63f00ec908b
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
7c93d8cff582 , < 43c32c22254b
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
b220c049d519 , < b16a249eca22
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
b220c049d519 , < 3e08a9f9760f
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
5.11
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
0 , < 5.11
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
4.9.273 , ≤ 5.0
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
4.14.237 , ≤ 4.15
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
4.19.195 , ≤ 4.20
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
5.4.126 , ≤ 5.5
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
5.10.44 , ≤ 5.11
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
5.12.11 , ≤ 5.13
(custom)
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
5.13
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
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"versionEndExcluding": "5.12.11",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.13",
"versionStartIncluding": "5.11",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Correct the length check which causes memory corruption\n\nWe\u0027ve suffered from severe kernel crashes due to memory corruption on\nour production environment, like,\n\nCall Trace:\n[1640542.554277] general protection fault: 0000 [#1] SMP PTI\n[1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: loaded Tainted:G\n[1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190\n[1640542.559074] RSP: 0018:ffffb16faa597df8 EFLAGS: 00010286\n[1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX:\n0000000006e931bf\n[1640542.560323] RDX: 0000000006e931be RSI: 0000000000400200 RDI:\nffff9a45ff004300\n[1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09:\n0000000000000000\n[1640542.561670] R10: 0000000000000000 R11: 0000000000000000 R12:\nffffffff9a20608d\n[1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15:\n696c662f65636976\n[1640542.563128] FS: 00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000)\nknlGS:0000000000000000\n[1640542.563937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4:\n00000000003606e0\n[1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2:\n0000000000000000\n[1640542.566069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:\n0000000000000400\n[1640542.566742] Call Trace:\n[1640542.567009] anon_vma_clone+0x5d/0x170\n[1640542.567417] __split_vma+0x91/0x1a0\n[1640542.567777] do_munmap+0x2c6/0x320\n[1640542.568128] vm_munmap+0x54/0x70\n[1640542.569990] __x64_sys_munmap+0x22/0x30\n[1640542.572005] do_syscall_64+0x5b/0x1b0\n[1640542.573724] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n[1640542.575642] RIP: 0033:0x7f45d6e61e27\n\nJames Wang has reproduced it stably on the latest 4.19 LTS.\nAfter some debugging, we finally proved that it\u0027s due to ftrace\nbuffer out-of-bound access using a debug tool as follows:\n[ 86.775200] BUG: Out-of-bounds write at addr 0xffff88aefe8b7000\n[ 86.780806] no_context+0xdf/0x3c0\n[ 86.784327] __do_page_fault+0x252/0x470\n[ 86.788367] do_page_fault+0x32/0x140\n[ 86.792145] page_fault+0x1e/0x30\n[ 86.795576] strncpy_from_unsafe+0x66/0xb0\n[ 86.799789] fetch_memory_string+0x25/0x40\n[ 86.804002] fetch_deref_string+0x51/0x60\n[ 86.808134] kprobe_trace_func+0x32d/0x3a0\n[ 86.812347] kprobe_dispatcher+0x45/0x50\n[ 86.816385] kprobe_ftrace_handler+0x90/0xf0\n[ 86.820779] ftrace_ops_assist_func+0xa1/0x140\n[ 86.825340] 0xffffffffc00750bf\n[ 86.828603] do_sys_open+0x5/0x1f0\n[ 86.832124] do_syscall_64+0x5b/0x1b0\n[ 86.835900] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\ncommit b220c049d519 (\"tracing: Check length before giving out\nthe filter buffer\") adds length check to protect trace data\noverflow introduced in 0fc1b09ff1ff, seems that this fix can\u0027t prevent\noverflow entirely, the length check should also take the sizeof\nentry-\u003earray[0] into account, since this array[0] is filled the\nlength of trace data and occupy addtional space and risk overflow."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The overflow is in local ftrace filter buffering (trace_event_buffer_lock_reserve), reached after writing tracefs filter/kprobe/trigger controls and then generating a near-page-sized event; it is not reachable from network or adjacent-link packet processing alone.\nAC:L - An attacker who can configure a filtered/soft-disabled event fully controls record length (e.g., kprobe string fetch of a chosen path length, or other dynamic payloads) and can hit the vulnerable PAGE_SIZE-minus-header window reliably with no race outside their control.\nPR:L - Enabling the path needs only TRACE_MODE_WRITE (0640) access under tracefs DAC/LOCKDOWN_TRACEFS (no capable() gate), and worst reasonable deployments (Android/perfetto, ChromeOS, gid=tracing mounts) grant that write access to non-root tracing users, matching other filter/buffered-event scorings.\nUI:N - The attacker writes the filter/kprobe configuration and triggers the oversized event themselves; no separate victim action is required.\nS:U - The out-of-bounds write corrupts host kernel memory within the same OS security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - This is a confirmed out-of-bounds write past the per-CPU filter page that caused production heap corruption; per guidance, exploitable memory corruption is treated as enabling high confidentiality impact.\nI:H - Out-of-bounds write past the allocated filter page is scored Integrity High, and the reported follow-on corruption (e.g., GPF in allocator paths) shows the overflow can corrupt adjacent kernel state usable for write/control-flow primitives.\nA:H - The bug was reproduced as an out-of-bounds write and caused severe kernel crashes/GPFs in production, which is High availability impact under kernel CVSS guidance."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T08:47:02.813Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/edcce01e0e50840a9aa6a70baed21477bdd2c9f9"
},
{
"url": "https://git.kernel.org/stable/c/2d598902799886d67947406f26ee8e5fd2ca097f"
},
{
"url": "https://git.kernel.org/stable/c/31ceae385556c37e4d286cb6378696448f566883"
},
{
"url": "https://git.kernel.org/stable/c/d63f00ec908b3be635ead5d6029cc94246e1f38d"
},
{
"url": "https://git.kernel.org/stable/c/43c32c22254b9328d7abb1c2b0f689dc67838e60"
},
{
"url": "https://git.kernel.org/stable/c/b16a249eca2230c2cd66fa1d4b94743bd9b6ef92"
},
{
"url": "https://git.kernel.org/stable/c/3e08a9f9760f4a70d633c328a76408e62d6f80a3"
}
],
"title": "tracing: Correct the length check which causes memory corruption",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47274",
"datePublished": "2024-05-21T14:20:02.694Z",
"dateReserved": "2024-05-21T13:27:52.127Z",
"dateUpdated": "2026-08-05T08:47:02.813Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2021-47274",
"date": "2026-09-19",
"epss": "0.00747",
"percentile": "0.5336"
},
"fkie_nvd": {
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Correct the length check which causes memory corruption\n\nWe\u0027ve suffered from severe kernel crashes due to memory corruption on\nour production environment, like,\n\nCall Trace:\n[1640542.554277] general protection fault: 0000 [#1] SMP PTI\n[1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: loaded Tainted:G\n[1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190\n[1640542.559074] RSP: 0018:ffffb16faa597df8 EFLAGS: 00010286\n[1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX:\n0000000006e931bf\n[1640542.560323] RDX: 0000000006e931be RSI: 0000000000400200 RDI:\nffff9a45ff004300\n[1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09:\n0000000000000000\n[1640542.561670] R10: 0000000000000000 R11: 0000000000000000 R12:\nffffffff9a20608d\n[1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15:\n696c662f65636976\n[1640542.563128] FS: 00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000)\nknlGS:0000000000000000\n[1640542.563937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4:\n00000000003606e0\n[1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2:\n0000000000000000\n[1640542.566069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:\n0000000000000400\n[1640542.566742] Call Trace:\n[1640542.567009] anon_vma_clone+0x5d/0x170\n[1640542.567417] __split_vma+0x91/0x1a0\n[1640542.567777] do_munmap+0x2c6/0x320\n[1640542.568128] vm_munmap+0x54/0x70\n[1640542.569990] __x64_sys_munmap+0x22/0x30\n[1640542.572005] do_syscall_64+0x5b/0x1b0\n[1640542.573724] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n[1640542.575642] RIP: 0033:0x7f45d6e61e27\n\nJames Wang has reproduced it stably on the latest 4.19 LTS.\nAfter some debugging, we finally proved that it\u0027s due to ftrace\nbuffer out-of-bound access using a debug tool as follows:\n[ 86.775200] BUG: Out-of-bounds write at addr 0xffff88aefe8b7000\n[ 86.780806] no_context+0xdf/0x3c0\n[ 86.784327] __do_page_fault+0x252/0x470\n[ 86.788367] do_page_fault+0x32/0x140\n[ 86.792145] page_fault+0x1e/0x30\n[ 86.795576] strncpy_from_unsafe+0x66/0xb0\n[ 86.799789] fetch_memory_string+0x25/0x40\n[ 86.804002] fetch_deref_string+0x51/0x60\n[ 86.808134] kprobe_trace_func+0x32d/0x3a0\n[ 86.812347] kprobe_dispatcher+0x45/0x50\n[ 86.816385] kprobe_ftrace_handler+0x90/0xf0\n[ 86.820779] ftrace_ops_assist_func+0xa1/0x140\n[ 86.825340] 0xffffffffc00750bf\n[ 86.828603] do_sys_open+0x5/0x1f0\n[ 86.832124] do_syscall_64+0x5b/0x1b0\n[ 86.835900] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\ncommit b220c049d519 (\"tracing: Check length before giving out\nthe filter buffer\") adds length check to protect trace data\noverflow introduced in 0fc1b09ff1ff, seems that this fix can\u0027t prevent\noverflow entirely, the length check should also take the sizeof\nentry-\u003earray[0] into account, since this array[0] is filled the\nlength of trace data and occupy addtional space and risk overflow."
},
{
"lang": "es",
"value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: rastreo: corrija la verificaci\u00f3n de longitud que causa corrupci\u00f3n de la memoria. Hemos sufrido fallos graves del kernel debido a la corrupci\u00f3n de la memoria en nuestro entorno de producci\u00f3n, como Call Trace: [1640542.554277] fallo de protecci\u00f3n general. : 0000 [#1] SMP PTI [1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: cargado Contaminado:G [1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190 [1640542.559074] : 0018:ffffb16faa597df8 EFLAGS: 00010286 [ 1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX: 0000000006e931bf [1640542.560323] RDX: 0000000006e931be RSI: 0000400200 RDI: ffff9a45ff004300 [1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09: 0000000000000000 [1640542.561670] : 0000000000000000 R11: 0000000000000000 R12: ffffffff9a20608d [1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15: 696c662f65636976 [1640542.563128] FS: 00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000) GS:0000000000000000 [1640542.563937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4: 00000000003606e0 [1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [1640542.5 66069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [1640542.566742] Seguimiento de llamadas: [1640542.567009] anon_vma_clone+0x5d/0x170 2.567417] __split_vma+0x91/0x1a0 [1640542.567777] do_munmap+0x2c6/0x320 [1640542.568128] vm_munmap+0x54/0x70 [1640542.569990] __x64_sys_munmap+0x22/0x30 [1640542.572005] _64+0x5b/0x1b0 [1640542.573724] entrada_SYSCALL_64_after_hwframe+0x44/0xa9 [1640542.575642] RIP: 0033:0x7f45d6e61e27 James Wang lo ha reproducido de forma estable en la \u00faltima versi\u00f3n 4.19 LTS. Despu\u00e9s de algunas depuraciones, finalmente demostramos que se debe al acceso fuera de los l\u00edmites al b\u00fafer ftrace usando una herramienta de depuraci\u00f3n de la siguiente manera: [86.775200] ERROR: Escritura fuera de los l\u00edmites en la direcci\u00f3n 0xffff88aefe8b7000 [86.780806] no_context+0xdf/0x3c0 [86.784327 ] __do_page_fault+0x252/0x470 [ 86.788367] do_page_fault+0x32/0x140 [ 86.792145] page_fault+0x1e/0x30 [ 86.795576] strncpy_from_unsafe+0x66/0xb0 [ 86.799789] ry_string+0x25/0x40 [ 86.804002] fetch_deref_string+0x51/0x60 [ 86.808134] kprobe_trace_func +0x32d/0x3a0 [ 86.812347] kprobe_dispatcher+0x45/0x50 [ 86.816385] kprobe_ftrace_handler+0x90/0xf0 [ 86.820779] ftrace_ops_assist_func+0xa1/0x140 [ 86.825340] ffffc00750bf [ 86.828603] do_sys_open+0x5/0x1f0 [ 86.832124] do_syscall_64+0x5b/0x1b0 [ 86.835900 ] Entry_SYSCALL_64_after_hwframe+0x44/0xa9 commit b220c049d519 (\"rastreo: verificar la longitud antes de entregar el b\u00fafer de filtro\") agrega verificaci\u00f3n de longitud para proteger el desbordamiento de datos de seguimiento introducido en 0fc1b09ff1ff, parece que esta soluci\u00f3n no puede evitar el desbordamiento por completo, la verificaci\u00f3n de longitud tambi\u00e9n deber\u00eda tenga en cuenta el tama\u00f1o de la entrada-\u0026gt;matriz[0], ya que esta matriz[0] ocupa toda la longitud de los datos de seguimiento y ocupa espacio adicional y corre el riesgo de desbordarse."
}
],
"id": "CVE-2021-47274",
"lastModified": "2024-11-21T06:35:46.540",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
},
"published": "2024-05-21T15:15:15.830",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/2d598902799886d67947406f26ee8e5fd2ca097f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/31ceae385556c37e4d286cb6378696448f566883"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3e08a9f9760f4a70d633c328a76408e62d6f80a3"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/43c32c22254b9328d7abb1c2b0f689dc67838e60"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b16a249eca2230c2cd66fa1d4b94743bd9b6ef92"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d63f00ec908b3be635ead5d6029cc94246e1f38d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/edcce01e0e50840a9aa6a70baed21477bdd2c9f9"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://git.kernel.org/stable/c/2d598902799886d67947406f26ee8e5fd2ca097f"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://git.kernel.org/stable/c/31ceae385556c37e4d286cb6378696448f566883"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://git.kernel.org/stable/c/3e08a9f9760f4a70d633c328a76408e62d6f80a3"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://git.kernel.org/stable/c/43c32c22254b9328d7abb1c2b0f689dc67838e60"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://git.kernel.org/stable/c/b16a249eca2230c2cd66fa1d4b94743bd9b6ef92"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://git.kernel.org/stable/c/d63f00ec908b3be635ead5d6029cc94246e1f38d"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://git.kernel.org/stable/c/edcce01e0e50840a9aa6a70baed21477bdd2c9f9"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-125"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/trace/trace.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "edcce01e0e50840a9aa6a70baed21477bdd2c9f9",
"status": "affected",
"version": "2e584b1a02eeb860e286d39bc408b25ebc5ec844",
"versionType": "git"
},
{
"lessThan": "2d598902799886d67947406f26ee8e5fd2ca097f",
"status": "affected",
"version": "e46d433754420b4d6513ca389403de88a0910279",
"versionType": "git"
},
{
"lessThan": "31ceae385556c37e4d286cb6378696448f566883",
"status": "affected",
"version": "0572fc6a510add9029b113239eaabf4b5bce8ec9",
"versionType": "git"
},
{
"lessThan": "d63f00ec908b3be635ead5d6029cc94246e1f38d",
"status": "affected",
"version": "a0997a86f5c0085e183ddee5fb72091d584d3d16",
"versionType": "git"
},
{
"lessThan": "43c32c22254b9328d7abb1c2b0f689dc67838e60",
"status": "affected",
"version": "7c93d8cff582c459350d6f8906eea6e4cd60d959",
"versionType": "git"
},
{
"lessThan": "b16a249eca2230c2cd66fa1d4b94743bd9b6ef92",
"status": "affected",
"version": "b220c049d5196dd94d992dd2dc8cba1a5e6123bf",
"versionType": "git"
},
{
"lessThan": "3e08a9f9760f4a70d633c328a76408e62d6f80a3",
"status": "affected",
"version": "b220c049d5196dd94d992dd2dc8cba1a5e6123bf",
"versionType": "git"
},
{
"lessThan": "4.9.273",
"status": "affected",
"version": "4.9.258",
"versionType": "semver"
},
{
"lessThan": "4.14.237",
"status": "affected",
"version": "4.14.222",
"versionType": "semver"
},
{
"lessThan": "4.19.195",
"status": "affected",
"version": "4.19.177",
"versionType": "semver"
},
{
"lessThan": "5.4.126",
"status": "affected",
"version": "5.4.99",
"versionType": "semver"
},
{
"lessThan": "5.10.44",
"status": "affected",
"version": "5.10.17",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"kernel/trace/trace.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.11"
},
{
"lessThan": "5.11",
"status": "unaffected",
"version": "0",
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Correct the length check which causes memory corruption\n\nWe\u0027ve suffered from severe kernel crashes due to memory corruption on\nour production environment, like,\n\nCall Trace:\n[1640542.554277] general protection fault: 0000 [#1] SMP PTI\n[1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: loaded Tainted:G\n[1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190\n[1640542.559074] RSP: 0018:ffffb16faa597df8 EFLAGS: 00010286\n[1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX:\n0000000006e931bf\n[1640542.560323] RDX: 0000000006e931be RSI: 0000000000400200 RDI:\nffff9a45ff004300\n[1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09:\n0000000000000000\n[1640542.561670] R10: 0000000000000000 R11: 0000000000000000 R12:\nffffffff9a20608d\n[1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15:\n696c662f65636976\n[1640542.563128] FS: 00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000)\nknlGS:0000000000000000\n[1640542.563937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4:\n00000000003606e0\n[1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2:\n0000000000000000\n[1640542.566069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:\n0000000000000400\n[1640542.566742] Call Trace:\n[1640542.567009] anon_vma_clone+0x5d/0x170\n[1640542.567417] __split_vma+0x91/0x1a0\n[1640542.567777] do_munmap+0x2c6/0x320\n[1640542.568128] vm_munmap+0x54/0x70\n[1640542.569990] __x64_sys_munmap+0x22/0x30\n[1640542.572005] do_syscall_64+0x5b/0x1b0\n[1640542.573724] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n[1640542.575642] RIP: 0033:0x7f45d6e61e27\n\nJames Wang has reproduced it stably on the latest 4.19 LTS.\nAfter some debugging, we finally proved that it\u0027s due to ftrace\nbuffer out-of-bound access using a debug tool as follows:\n[ 86.775200] BUG: Out-of-bounds write at addr 0xffff88aefe8b7000\n[ 86.780806] no_context+0xdf/0x3c0\n[ 86.784327] __do_page_fault+0x252/0x470\n[ 86.788367] do_page_fault+0x32/0x140\n[ 86.792145] page_fault+0x1e/0x30\n[ 86.795576] strncpy_from_unsafe+0x66/0xb0\n[ 86.799789] fetch_memory_string+0x25/0x40\n[ 86.804002] fetch_deref_string+0x51/0x60\n[ 86.808134] kprobe_trace_func+0x32d/0x3a0\n[ 86.812347] kprobe_dispatcher+0x45/0x50\n[ 86.816385] kprobe_ftrace_handler+0x90/0xf0\n[ 86.820779] ftrace_ops_assist_func+0xa1/0x140\n[ 86.825340] 0xffffffffc00750bf\n[ 86.828603] do_sys_open+0x5/0x1f0\n[ 86.832124] do_syscall_64+0x5b/0x1b0\n[ 86.835900] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\ncommit b220c049d519 (\"tracing: Check length before giving out\nthe filter buffer\") adds length check to protect trace data\noverflow introduced in 0fc1b09ff1ff, seems that this fix can\u0027t prevent\noverflow entirely, the length check should also take the sizeof\nentry-\u003earray[0] into account, since this array[0] is filled the\nlength of trace data and occupy addtional space and risk overflow."
},
{
"lang": "es",
"value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: rastreo: corrija la verificaci\u00f3n de longitud que causa corrupci\u00f3n de la memoria. Hemos sufrido fallos graves del kernel debido a la corrupci\u00f3n de la memoria en nuestro entorno de producci\u00f3n, como Call Trace: [1640542.554277] fallo de protecci\u00f3n general. : 0000 [#1] SMP PTI [1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: cargado Contaminado:G [1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190 [1640542.559074] : 0018:ffffb16faa597df8 EFLAGS: 00010286 [ 1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX: 0000000006e931bf [1640542.560323] RDX: 0000000006e931be RSI: 0000400200 RDI: ffff9a45ff004300 [1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09: 0000000000000000 [1640542.561670] : 0000000000000000 R11: 0000000000000000 R12: ffffffff9a20608d [1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15: 696c662f65636976 [1640542.563128] FS: 00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000) GS:0000000000000000 [1640542.563937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4: 00000000003606e0 [1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [1640542.5 66069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [1640542.566742] Seguimiento de llamadas: [1640542.567009] anon_vma_clone+0x5d/0x170 2.567417] __split_vma+0x91/0x1a0 [1640542.567777] do_munmap+0x2c6/0x320 [1640542.568128] vm_munmap+0x54/0x70 [1640542.569990] __x64_sys_munmap+0x22/0x30 [1640542.572005] _64+0x5b/0x1b0 [1640542.573724] entrada_SYSCALL_64_after_hwframe+0x44/0xa9 [1640542.575642] RIP: 0033:0x7f45d6e61e27 James Wang lo ha reproducido de forma estable en la \u00faltima versi\u00f3n 4.19 LTS. Despu\u00e9s de algunas depuraciones, finalmente demostramos que se debe al acceso fuera de los l\u00edmites al b\u00fafer ftrace usando una herramienta de depuraci\u00f3n de la siguiente manera: [86.775200] ERROR: Escritura fuera de los l\u00edmites en la direcci\u00f3n 0xffff88aefe8b7000 [86.780806] no_context+0xdf/0x3c0 [86.784327 ] __do_page_fault+0x252/0x470 [ 86.788367] do_page_fault+0x32/0x140 [ 86.792145] page_fault+0x1e/0x30 [ 86.795576] strncpy_from_unsafe+0x66/0xb0 [ 86.799789] ry_string+0x25/0x40 [ 86.804002] fetch_deref_string+0x51/0x60 [ 86.808134] kprobe_trace_func +0x32d/0x3a0 [ 86.812347] kprobe_dispatcher+0x45/0x50 [ 86.816385] kprobe_ftrace_handler+0x90/0xf0 [ 86.820779] ftrace_ops_assist_func+0xa1/0x140 [ 86.825340] ffffc00750bf [ 86.828603] do_sys_open+0x5/0x1f0 [ 86.832124] do_syscall_64+0x5b/0x1b0 [ 86.835900 ] Entry_SYSCALL_64_after_hwframe+0x44/0xa9 commit b220c049d519 (\"rastreo: verificar la longitud antes de entregar el b\u00fafer de filtro\") agrega verificaci\u00f3n de longitud para proteger el desbordamiento de datos de seguimiento introducido en 0fc1b09ff1ff, parece que esta soluci\u00f3n no puede evitar el desbordamiento por completo, la verificaci\u00f3n de longitud tambi\u00e9n deber\u00eda tenga en cuenta el tama\u00f1o de la entrada-\u0026gt;matriz[0], ya que esta matriz[0] ocupa toda la longitud de los datos de seguimiento y ocupa espacio adicional y corre el riesgo de desbordarse."
}
],
"id": "CVE-2021-47274",
"lastModified": "2026-08-04T10:16:55.860",
"metrics": {
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{
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"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
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{
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"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
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{
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},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2024-06-06T18:18:56.660554Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-05-21T15:15:15.830",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Correct the length check which causes memory corruption\n\nWe\u0027ve suffered from severe kernel crashes due to memory corruption on\nour production environment, like,\n\nCall Trace:\n[1640542.554277] general protection fault: 0000 [#1] SMP PTI\n[1640542.554856] CPU: 17 PID: 26996 Comm: python Kdump: loaded Tainted:G\n[1640542.556629] RIP: 0010:kmem_cache_alloc+0x90/0x190\n[1640542.559074] RSP: 0018:ffffb16faa597df8 EFLAGS: 00010286\n[1640542.559587] RAX: 0000000000000000 RBX: 0000000000400200 RCX:\n0000000006e931bf\n[1640542.560323] RDX: 0000000006e931be RSI: 0000000000400200 RDI:\nffff9a45ff004300\n[1640542.560996] RBP: 0000000000400200 R08: 0000000000023420 R09:\n0000000000000000\n[1640542.561670] R10: 0000000000000000 R11: 0000000000000000 R12:\nffffffff9a20608d\n[1640542.562366] R13: ffff9a45ff004300 R14: ffff9a45ff004300 R15:\n696c662f65636976\n[1640542.563128] FS: 00007f45d7c6f740(0000) GS:ffff9a45ff840000(0000)\nknlGS:0000000000000000\n[1640542.563937] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[1640542.564557] CR2: 00007f45d71311a0 CR3: 000000189d63e004 CR4:\n00000000003606e0\n[1640542.565279] DR0: 0000000000000000 DR1: 0000000000000000 DR2:\n0000000000000000\n[1640542.566069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:\n0000000000000400\n[1640542.566742] Call Trace:\n[1640542.567009] anon_vma_clone+0x5d/0x170\n[1640542.567417] __split_vma+0x91/0x1a0\n[1640542.567777] do_munmap+0x2c6/0x320\n[1640542.568128] vm_munmap+0x54/0x70\n[1640542.569990] __x64_sys_munmap+0x22/0x30\n[1640542.572005] do_syscall_64+0x5b/0x1b0\n[1640542.573724] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n[1640542.575642] RIP: 0033:0x7f45d6e61e27\n\nJames Wang has reproduced it stably on the latest 4.19 LTS.\nAfter some debugging, we finally proved that it\u0027s due to ftrace\nbuffer out-of-bound access using a debug tool as follows:\n[ 86.775200] BUG: Out-of-bounds write at addr 0xffff88aefe8b7000\n[ 86.780806] no_context+0xdf/0x3c0\n[ 86.784327] __do_page_fault+0x252/0x470\n[ 86.788367] do_page_fault+0x32/0x140\n[ 86.792145] page_fault+0x1e/0x30\n[ 86.795576] strncpy_from_unsafe+0x66/0xb0\n[ 86.799789] fetch_memory_string+0x25/0x40\n[ 86.804002] fetch_deref_string+0x51/0x60\n[ 86.808134] kprobe_trace_func+0x32d/0x3a0\n[ 86.812347] kprobe_dispatcher+0x45/0x50\n[ 86.816385] kprobe_ftrace_handler+0x90/0xf0\n[ 86.820779] ftrace_ops_assist_func+0xa1/0x140\n[ 86.825340] 0xffffffffc00750bf\n[ 86.828603] do_sys_open+0x5/0x1f0\n[ 86.832124] do_syscall_64+0x5b/0x1b0\n[ 86.835900] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\ncommit b220c049d519 (\"tracing: Check length before giving out\nthe filter buffer\") adds length check to protect trace data\noverflow introduced in 0fc1b09ff1ff, seems that this fix can\u0027t prevent\noverflow entirely, the length check should also take the sizeof\nentry-\u003earray[0] into account, since this array[0] is filled the\nlength of trace data and occupy addtional space and risk overflow."
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},
{
"url": "https://git.kernel.org/stable/c/b16a249eca2230c2cd66fa1d4b94743bd9b6ef92"
},
{
"url": "https://git.kernel.org/stable/c/3e08a9f9760f4a70d633c328a76408e62d6f80a3"
}
],
"title": "tracing: Correct the length check which causes memory corruption",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-47274",
"datePublished": "2024-05-21T14:20:02.694Z",
"dateReserved": "2024-05-21T13:27:52.127Z",
"dateUpdated": "2026-08-05T08:47:02.813Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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