{"id":"CVE-2026-23121","state":"PUBLISHED","title":"mISDN: annotate data-race around dev->work","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmISDN: annotate data-race around dev->work\n\ndev->work 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 -> 0x00000001","publishedAt":"2026-02-14T15:09:51.912Z","updatedAt":"2026-10-19T18:25:32.103Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"d5d99cb9e0839093cd53aa3b28176fce2f820ca0","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"13f3b3b87068898056db4c79ee67052fbde11d43","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"accc3f8266d2a49881dbcf78c459477f4efa0ff3","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"aa6e33cd74ca4965f2bbcb025e0b672fb0168a69","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"7ac345a93af31358e18e9606eb7b354691bf6757","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"8175dbf174d487afab81e936a862a8d9b8a1ccb6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/isdn/mISDN/timerdev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.27","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.27","versionType":"semver"},{"version":"5.10.249","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.199","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.162","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.122","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.68","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.8","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/isdn/mISDN/timerdev.c"]}],"references":["https://git.kernel.org/stable/c/d5d99cb9e0839093cd53aa3b28176fce2f820ca0","https://git.kernel.org/stable/c/13f3b3b87068898056db4c79ee67052fbde11d43","https://git.kernel.org/stable/c/accc3f8266d2a49881dbcf78c459477f4efa0ff3","https://git.kernel.org/stable/c/fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7","https://git.kernel.org/stable/c/aa6e33cd74ca4965f2bbcb025e0b672fb0168a69","https://git.kernel.org/stable/c/7ac345a93af31358e18e9606eb7b354691bf6757","https://git.kernel.org/stable/c/8175dbf174d487afab81e936a862a8d9b8a1ccb6"],"weaknesses":["CWE-362"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23121.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23121","state":"PUBLISHED","datePublished":"2026-02-14T15:09:51.912Z","dateUpdated":"2026-10-19T18:25:32.103Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.970Z"},"containers":{"cna":{"title":"mISDN: annotate data-race around dev->work","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmISDN: annotate data-race around dev->work\n\ndev->work 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 -> 0x00000001"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"d5d99cb9e0839093cd53aa3b28176fce2f820ca0","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"13f3b3b87068898056db4c79ee67052fbde11d43","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"accc3f8266d2a49881dbcf78c459477f4efa0ff3","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"aa6e33cd74ca4965f2bbcb025e0b672fb0168a69","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"7ac345a93af31358e18e9606eb7b354691bf6757","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","status":"affected","lessThan":"8175dbf174d487afab81e936a862a8d9b8a1ccb6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/isdn/mISDN/timerdev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.27","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.27","versionType":"semver"},{"version":"5.10.249","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.199","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.162","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.122","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.68","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.8","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/isdn/mISDN/timerdev.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:00:32.188Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"5.10.249"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"5.15.199"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"6.1.162"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"6.6.122"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"6.12.68"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"6.18.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.27","versionEndExcluding":"6.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-23121","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-06-10T20:40:15.361866Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-362","lang":"en","type":"CWE","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T18:25:32.103Z"}}]}}}