CVE-2023-53671 (GCVE-0-2023-53671)
Vulnerability from cvelistv5
Published
2025-10-07 15:21
Modified
2026-01-05 10:21
Severity ?
Summary
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---
References
Impacted products
Vendor Product Version
Linux Linux Version: 994f706872e6ce080506bd795ecf783d5b617de6
Version: 994f706872e6ce080506bd795ecf783d5b617de6
Version: 994f706872e6ce080506bd795ecf783d5b617de6
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/rcu/srcutree.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2c4d26dad76eadaa45a24543e311e9ce5d09f04e",
              "status": "affected",
              "version": "994f706872e6ce080506bd795ecf783d5b617de6",
              "versionType": "git"
            },
            {
              "lessThan": "c7c0bc03fa44942fe0fdc5ac52cda6e11529c0ea",
              "status": "affected",
              "version": "994f706872e6ce080506bd795ecf783d5b617de6",
              "versionType": "git"
            },
            {
              "lessThan": "7f24626d6dd844bfc6d1f492d214d29c86d02550",
              "status": "affected",
              "version": "994f706872e6ce080506bd795ecf783d5b617de6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/rcu/srcutree.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.16",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.3",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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 \u003cxyz.com\u003e\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 \u003e /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 \u003cSF,EE,PR,ME,IR,DR,RI,LE\u003e  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 \u003e /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---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-05T10:21:45.670Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53671",
    "datePublished": "2025-10-07T15:21:28.307Z",
    "dateReserved": "2025-10-07T15:16:59.663Z",
    "dateUpdated": "2026-01-05T10:21:45.670Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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