CVE-2026-23121 (GCVE-0-2026-23121)

Vulnerability from cvelistv5 – Published: 2026-02-14 15:09 – Updated: 2026-02-14 15:09
VLAI?
Title
mISDN: annotate data-race around dev->work
Summary
In the Linux kernel, the following vulnerability has been resolved: mISDN: annotate data-race around dev->work dev->work can re read locklessly in mISDN_read() and mISDN_poll(). Add READ_ONCE()/WRITE_ONCE() annotations. BUG: KCSAN: data-race in mISDN_ioctl / mISDN_read write to 0xffff88812d848280 of 4 bytes by task 10864 on cpu 1: misdn_add_timer drivers/isdn/mISDN/timerdev.c:175 [inline] mISDN_ioctl+0x2fb/0x550 drivers/isdn/mISDN/timerdev.c:233 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583 x64_sys_call+0x14b0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88812d848280 of 4 bytes by task 10857 on cpu 0: mISDN_read+0x1f2/0x470 drivers/isdn/mISDN/timerdev.c:112 do_loop_readv_writev fs/read_write.c:847 [inline] vfs_readv+0x3fb/0x690 fs/read_write.c:1020 do_readv+0xe7/0x210 fs/read_write.c:1080 __do_sys_readv fs/read_write.c:1165 [inline] __se_sys_readv fs/read_write.c:1162 [inline] __x64_sys_readv+0x45/0x50 fs/read_write.c:1162 x64_sys_call+0x2831/0x3000 arch/x86/include/generated/asm/syscalls_64.h:20 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000 -> 0x00000001
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1b2b03f8e514e4f68e293846ba511a948b80243c , < d5d99cb9e0839093cd53aa3b28176fce2f820ca0 (git)
Affected: 1b2b03f8e514e4f68e293846ba511a948b80243c , < 13f3b3b87068898056db4c79ee67052fbde11d43 (git)
Affected: 1b2b03f8e514e4f68e293846ba511a948b80243c , < accc3f8266d2a49881dbcf78c459477f4efa0ff3 (git)
Affected: 1b2b03f8e514e4f68e293846ba511a948b80243c , < fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7 (git)
Affected: 1b2b03f8e514e4f68e293846ba511a948b80243c , < aa6e33cd74ca4965f2bbcb025e0b672fb0168a69 (git)
Affected: 1b2b03f8e514e4f68e293846ba511a948b80243c , < 7ac345a93af31358e18e9606eb7b354691bf6757 (git)
Affected: 1b2b03f8e514e4f68e293846ba511a948b80243c , < 8175dbf174d487afab81e936a862a8d9b8a1ccb6 (git)
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    Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.68 , ≤ 6.12.* (semver)
Unaffected: 6.18.8 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/isdn/mISDN/timerdev.c"
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          "vendor": "Linux",
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.162",
              "versionType": "semver"
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              "lessThanOrEqual": "6.6.*",
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              "version": "6.6.122",
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.68",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
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              "version": "6.18.8",
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              "lessThanOrEqual": "*",
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              "version": "6.19",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
            }
          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmISDN: annotate data-race around dev-\u003ework\n\ndev-\u003ework can re read locklessly in mISDN_read()\nand mISDN_poll(). Add READ_ONCE()/WRITE_ONCE() annotations.\n\nBUG: KCSAN: data-race in mISDN_ioctl / mISDN_read\n\nwrite to 0xffff88812d848280 of 4 bytes by task 10864 on cpu 1:\n  misdn_add_timer drivers/isdn/mISDN/timerdev.c:175 [inline]\n  mISDN_ioctl+0x2fb/0x550 drivers/isdn/mISDN/timerdev.c:233\n  vfs_ioctl fs/ioctl.c:51 [inline]\n  __do_sys_ioctl fs/ioctl.c:597 [inline]\n  __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583\n  __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583\n  x64_sys_call+0x14b0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:17\n  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n  do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nread to 0xffff88812d848280 of 4 bytes by task 10857 on cpu 0:\n  mISDN_read+0x1f2/0x470 drivers/isdn/mISDN/timerdev.c:112\n  do_loop_readv_writev fs/read_write.c:847 [inline]\n  vfs_readv+0x3fb/0x690 fs/read_write.c:1020\n  do_readv+0xe7/0x210 fs/read_write.c:1080\n  __do_sys_readv fs/read_write.c:1165 [inline]\n  __se_sys_readv fs/read_write.c:1162 [inline]\n  __x64_sys_readv+0x45/0x50 fs/read_write.c:1162\n  x64_sys_call+0x2831/0x3000 arch/x86/include/generated/asm/syscalls_64.h:20\n  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n  do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nvalue changed: 0x00000000 -\u003e 0x00000001"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-14T15:09:51.912Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d5d99cb9e0839093cd53aa3b28176fce2f820ca0"
        },
        {
          "url": "https://git.kernel.org/stable/c/13f3b3b87068898056db4c79ee67052fbde11d43"
        },
        {
          "url": "https://git.kernel.org/stable/c/accc3f8266d2a49881dbcf78c459477f4efa0ff3"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa6e33cd74ca4965f2bbcb025e0b672fb0168a69"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ac345a93af31358e18e9606eb7b354691bf6757"
        },
        {
          "url": "https://git.kernel.org/stable/c/8175dbf174d487afab81e936a862a8d9b8a1ccb6"
        }
      ],
      "title": "mISDN: annotate data-race around dev-\u003ework",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23121",
    "datePublished": "2026-02-14T15:09:51.912Z",
    "dateReserved": "2026-01-13T15:37:45.970Z",
    "dateUpdated": "2026-02-14T15:09:51.912Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23121\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-14T15:16:07.280\",\"lastModified\":\"2026-02-14T15:16:07.280\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmISDN: annotate data-race around dev-\u003ework\\n\\ndev-\u003ework can re read locklessly in mISDN_read()\\nand mISDN_poll(). Add READ_ONCE()/WRITE_ONCE() annotations.\\n\\nBUG: KCSAN: data-race in mISDN_ioctl / mISDN_read\\n\\nwrite to 0xffff88812d848280 of 4 bytes by task 10864 on cpu 1:\\n  misdn_add_timer drivers/isdn/mISDN/timerdev.c:175 [inline]\\n  mISDN_ioctl+0x2fb/0x550 drivers/isdn/mISDN/timerdev.c:233\\n  vfs_ioctl fs/ioctl.c:51 [inline]\\n  __do_sys_ioctl fs/ioctl.c:597 [inline]\\n  __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583\\n  __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583\\n  x64_sys_call+0x14b0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:17\\n  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n  do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n\\nread to 0xffff88812d848280 of 4 bytes by task 10857 on cpu 0:\\n  mISDN_read+0x1f2/0x470 drivers/isdn/mISDN/timerdev.c:112\\n  do_loop_readv_writev fs/read_write.c:847 [inline]\\n  vfs_readv+0x3fb/0x690 fs/read_write.c:1020\\n  do_readv+0xe7/0x210 fs/read_write.c:1080\\n  __do_sys_readv fs/read_write.c:1165 [inline]\\n  __se_sys_readv fs/read_write.c:1162 [inline]\\n  __x64_sys_readv+0x45/0x50 fs/read_write.c:1162\\n  x64_sys_call+0x2831/0x3000 arch/x86/include/generated/asm/syscalls_64.h:20\\n  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n  do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n\\nvalue changed: 0x00000000 -\u003e 0x00000001\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/13f3b3b87068898056db4c79ee67052fbde11d43\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ac345a93af31358e18e9606eb7b354691bf6757\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8175dbf174d487afab81e936a862a8d9b8a1ccb6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa6e33cd74ca4965f2bbcb025e0b672fb0168a69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/accc3f8266d2a49881dbcf78c459477f4efa0ff3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d5d99cb9e0839093cd53aa3b28176fce2f820ca0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Sightings

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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.



Detection rules are retrieved from Rulezet.