CVE-2023-53671
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: srcu: Delegate work to the boot cpu if using SRCU_SIZE_SMALL Commit 994f706872e6 ("srcu: Make Tree SRCU able to operate without snp_node array") assumes that cpu 0 is always online. However, there really are situations when some other CPU is the boot CPU, for example, when booting a kdump kernel with the maxcpus=1 boot parameter. On PowerPC, the kdump kernel can hang as follows: ... [ 1.740036] systemd[1]: Hostname set to <xyz.com> [ 243.686240] INFO: task systemd:1 blocked for more than 122 seconds. [ 243.686264] Not tainted 6.1.0-rc1 #1 [ 243.686272] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 243.686281] task:systemd state:D stack:0 pid:1 ppid:0 flags:0x00042000 [ 243.686296] Call Trace: [ 243.686301] [c000000016657640] [c000000016657670] 0xc000000016657670 (unreliable) [ 243.686317] [c000000016657830] [c00000001001dec0] __switch_to+0x130/0x220 [ 243.686333] [c000000016657890] [c000000010f607b8] __schedule+0x1f8/0x580 [ 243.686347] [c000000016657940] [c000000010f60bb4] schedule+0x74/0x140 [ 243.686361] [c0000000166579b0] [c000000010f699b8] schedule_timeout+0x168/0x1c0 [ 243.686374] [c000000016657a80] [c000000010f61de8] __wait_for_common+0x148/0x360 [ 243.686387] [c000000016657b20] [c000000010176bb0] __flush_work.isra.0+0x1c0/0x3d0 [ 243.686401] [c000000016657bb0] [c0000000105f2768] fsnotify_wait_marks_destroyed+0x28/0x40 [ 243.686415] [c000000016657bd0] [c0000000105f21b8] fsnotify_destroy_group+0x68/0x160 [ 243.686428] [c000000016657c40] [c0000000105f6500] inotify_release+0x30/0xa0 [ 243.686440] [c000000016657cb0] [c0000000105751a8] __fput+0xc8/0x350 [ 243.686452] [c000000016657d00] [c00000001017d524] task_work_run+0xe4/0x170 [ 243.686464] [c000000016657d50] [c000000010020e94] do_notify_resume+0x134/0x140 [ 243.686478] [c000000016657d80] [c00000001002eb18] interrupt_exit_user_prepare_main+0x198/0x270 [ 243.686493] [c000000016657de0] [c00000001002ec60] syscall_exit_prepare+0x70/0x180 [ 243.686505] [c000000016657e10] [c00000001000bf7c] system_call_vectored_common+0xfc/0x280 [ 243.686520] --- interrupt: 3000 at 0x7fffa47d5ba4 [ 243.686528] NIP: 00007fffa47d5ba4 LR: 0000000000000000 CTR: 0000000000000000 [ 243.686538] REGS: c000000016657e80 TRAP: 3000 Not tainted (6.1.0-rc1) [ 243.686548] MSR: 800000000000d033 <SF,EE,PR,ME,IR,DR,RI,LE> CR: 42044440 XER: 00000000 [ 243.686572] IRQMASK: 0 [ 243.686572] GPR00: 0000000000000006 00007ffffa606710 00007fffa48e7200 0000000000000000 [ 243.686572] GPR04: 0000000000000002 000000000000000a 0000000000000000 0000000000000001 [ 243.686572] GPR08: 000001000c172dd0 0000000000000000 0000000000000000 0000000000000000 [ 243.686572] GPR12: 0000000000000000 00007fffa4ff4bc0 0000000000000000 0000000000000000 [ 243.686572] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 243.686572] GPR20: 0000000132dfdc50 000000000000000e 0000000000189375 0000000000000000 [ 243.686572] GPR24: 00007ffffa606ae0 0000000000000005 000001000c185490 000001000c172570 [ 243.686572] GPR28: 000001000c172990 000001000c184850 000001000c172e00 00007fffa4fedd98 [ 243.686683] NIP [00007fffa47d5ba4] 0x7fffa47d5ba4 [ 243.686691] LR [0000000000000000] 0x0 [ 243.686698] --- interrupt: 3000 [ 243.686708] INFO: task kworker/u16:1:24 blocked for more than 122 seconds. [ 243.686717] Not tainted 6.1.0-rc1 #1 [ 243.686724] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 243.686733] task:kworker/u16:1 state:D stack:0 pid:24 ppid:2 flags:0x00000800 [ 243.686747] Workqueue: events_unbound fsnotify_mark_destroy_workfn [ 243.686758] Call Trace: [ 243.686762] [c0000000166736e0] [c00000004fd91000] 0xc00000004fd91000 (unreliable) [ 243.686775] [c0000000166738d0] [c00000001001dec0] __switch_to+0x130/0x220 [ 243.686788] [c000000016673930] [c000000010f607b8] __schedule+0x1f8/0x ---truncated---
View original CVE JSON
{
"id": "CVE-2023-53671",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-10-07T16:15:51.000",
"lastModified": "2026-11-05T21:17:31.657",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsrcu: Delegate work to the boot cpu if using SRCU_SIZE_SMALL\n\nCommit 994f706872e6 (\"srcu: Make Tree SRCU able to operate without\nsnp_node array\") assumes that cpu 0 is always online. However, there\nreally are situations when some other CPU is the boot CPU, for example,\nwhen booting a kdump kernel with the maxcpus=1 boot parameter.\n\nOn PowerPC, the kdump kernel can hang as follows:\n...\n[ 1.740036] systemd[1]: Hostname set to <xyz.com>\n[ 243.686240] INFO: task systemd:1 blocked for more than 122 seconds.\n[ 243.686264] Not tainted 6.1.0-rc1 #1\n[ 243.686272] \"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n[ 243.686281] task:systemd state:D stack:0 pid:1 ppid:0 flags:0x00042000\n[ 243.686296] Call Trace:\n[ 243.686301] [c000000016657640] [c000000016657670] 0xc000000016657670 (unreliable)\n[ 243.686317] [c000000016657830] [c00000001001dec0] __switch_to+0x130/0x220\n[ 243.686333] [c000000016657890] [c000000010f607b8] __schedule+0x1f8/0x580\n[ 243.686347] [c000000016657940] [c000000010f60bb4] schedule+0x74/0x140\n[ 243.686361] [c0000000166579b0] [c000000010f699b8] schedule_timeout+0x168/0x1c0\n[ 243.686374] [c000000016657a80] [c000000010f61de8] __wait_for_common+0x148/0x360\n[ 243.686387] [c000000016657b20] [c000000010176bb0] __flush_work.isra.0+0x1c0/0x3d0\n[ 243.686401] [c000000016657bb0] [c0000000105f2768] fsnotify_wait_marks_destroyed+0x28/0x40\n[ 243.686415] [c000000016657bd0] [c0000000105f21b8] fsnotify_destroy_group+0x68/0x160\n[ 243.686428] [c000000016657c40] [c0000000105f6500] inotify_release+0x30/0xa0\n[ 243.686440] [c000000016657cb0] [c0000000105751a8] __fput+0xc8/0x350\n[ 243.686452] [c000000016657d00] [c00000001017d524] task_work_run+0xe4/0x170\n[ 243.686464] [c000000016657d50] [c000000010020e94] do_notify_resume+0x134/0x140\n[ 243.686478] [c000000016657d80] [c00000001002eb18] interrupt_exit_user_prepare_main+0x198/0x270\n[ 243.686493] [c000000016657de0] [c00000001002ec60] syscall_exit_prepare+0x70/0x180\n[ 243.686505] [c000000016657e10] [c00000001000bf7c] system_call_vectored_common+0xfc/0x280\n[ 243.686520] --- interrupt: 3000 at 0x7fffa47d5ba4\n[ 243.686528] NIP: 00007fffa47d5ba4 LR: 0000000000000000 CTR: 0000000000000000\n[ 243.686538] REGS: c000000016657e80 TRAP: 3000 Not tainted (6.1.0-rc1)\n[ 243.686548] MSR: 800000000000d033 <SF,EE,PR,ME,IR,DR,RI,LE> CR: 42044440 XER: 00000000\n[ 243.686572] IRQMASK: 0\n[ 243.686572] GPR00: 0000000000000006 00007ffffa606710 00007fffa48e7200 0000000000000000\n[ 243.686572] GPR04: 0000000000000002 000000000000000a 0000000000000000 0000000000000001\n[ 243.686572] GPR08: 000001000c172dd0 0000000000000000 0000000000000000 0000000000000000\n[ 243.686572] GPR12: 0000000000000000 00007fffa4ff4bc0 0000000000000000 0000000000000000\n[ 243.686572] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000\n[ 243.686572] GPR20: 0000000132dfdc50 000000000000000e 0000000000189375 0000000000000000\n[ 243.686572] GPR24: 00007ffffa606ae0 0000000000000005 000001000c185490 000001000c172570\n[ 243.686572] GPR28: 000001000c172990 000001000c184850 000001000c172e00 00007fffa4fedd98\n[ 243.686683] NIP [00007fffa47d5ba4] 0x7fffa47d5ba4\n[ 243.686691] LR [0000000000000000] 0x0\n[ 243.686698] --- interrupt: 3000\n[ 243.686708] INFO: task kworker/u16:1:24 blocked for more than 122 seconds.\n[ 243.686717] Not tainted 6.1.0-rc1 #1\n[ 243.686724] \"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n[ 243.686733] task:kworker/u16:1 state:D stack:0 pid:24 ppid:2 flags:0x00000800\n[ 243.686747] Workqueue: events_unbound fsnotify_mark_destroy_workfn\n[ 243.686758] Call Trace:\n[ 243.686762] [c0000000166736e0] [c00000004fd91000] 0xc00000004fd91000 (unreliable)\n[ 243.686775] [c0000000166738d0] [c00000001001dec0] __switch_to+0x130/0x220\n[ 243.686788] [c000000016673930] [c000000010f607b8] __schedule+0x1f8/0x\n---truncated---"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"kernel/rcu/srcutree.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "994f706872e6ce080506bd795ecf783d5b617de6",
"lessThan": "2c4d26dad76eadaa45a24543e311e9ce5d09f04e",
"versionType": "git",
"status": "affected"
},
{
"version": "994f706872e6ce080506bd795ecf783d5b617de6",
"lessThan": "c7c0bc03fa44942fe0fdc5ac52cda6e11529c0ea",
"versionType": "git",
"status": "affected"
},
{
"version": "994f706872e6ce080506bd795ecf783d5b617de6",
"lessThan": "7f24626d6dd844bfc6d1f492d214d29c86d02550",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"kernel/rcu/srcutree.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "5.19",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.19",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.16",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.2.3",
"lessThanOrEqual": "6.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-11-05T20:26:56.198066Z",
"id": "CVE-2023-53671",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.19",
"versionEndExcluding": "6.1.16",
"matchCriteriaId": "A9E5492C-0786-4BD9-A043-DBAA6E28BFE6"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.2",
"versionEndExcluding": "6.2.3",
"matchCriteriaId": "88C67289-22AD-4CA9-B202-5F5A80E5BA4B"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/2c4d26dad76eadaa45a24543e311e9ce5d09f04e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/7f24626d6dd844bfc6d1f492d214d29c86d02550",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/c7c0bc03fa44942fe0fdc5ac52cda6e11529c0ea",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
}
]
}