CVE-2023-53671 - Vulnerability Details

Link	Providers
https://git.kernel.org/stable/c/2c4d26dad76eadaa45a24543e311e9ce5d09f04e
https://git.kernel.org/stable/c/7f24626d6dd844bfc6d1f492d214d29c86d02550
https://git.kernel.org/stable/c/c7c0bc03fa44942fe0fdc5ac52cda6e11529c0ea

Type	Values Removed	Values Added
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---
Title		srcu: Delegate work to the boot cpu if using SRCU_SIZE_SMALL
References		https://git.kernel.org/stable/c/2c4d26dad76eadaa45a24543e311e9ce5d09f04e https://git.kernel.org/stable/c/7f24626d6dd844bfc6d1f492d214d29c86d02550 https://git.kernel.org/stable/c/c7c0bc03fa44942fe0fdc5ac52cda6e11529c0ea

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2023-53671", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-10-07T15:16:59.663Z", "datePublished": "2025-10-07T15:21:28.307Z", "dateUpdated": "2025-10-07T15:21:28.307Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-10-07T15:21:28.307Z"}, "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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/rcu/srcutree.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "2c4d26dad76eadaa45a24543e311e9ce5d09f04e", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "c7c0bc03fa44942fe0fdc5ac52cda6e11529c0ea", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7f24626d6dd844bfc6d1f492d214d29c86d02550", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/rcu/srcutree.c"], "versions": [{"version": "6.1.16", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.2.3", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.1.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.2.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2c4d26dad76eadaa45a24543e311e9ce5d09f04e"}, {"url": "https://git.kernel.org/stable/c/c7c0bc03fa44942fe0fdc5ac52cda6e11529c0ea"}, {"url": "https://git.kernel.org/stable/c/7f24626d6dd844bfc6d1f492d214d29c86d02550"}], "title": "srcu: Delegate work to the boot cpu if using SRCU_SIZE_SMALL", "x_generator": {"engine": "bippy-1.2.0"}}}}

{"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---"}], "id": "CVE-2023-53671", "lastModified": "2025-10-07T16:15:51.000", "metrics": {}, "published": "2025-10-07T16:15:51.000", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2c4d26dad76eadaa45a24543e311e9ce5d09f04e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7f24626d6dd844bfc6d1f492d214d29c86d02550"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c7c0bc03fa44942fe0fdc5ac52cda6e11529c0ea"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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