{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23121","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:45.970Z","datePublished":"2026-02-14T15:09:51.912Z","dateUpdated":"2026-05-11T22:00:32.188Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:00:32.188Z"},"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":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/isdn/mISDN/timerdev.c"],"versions":[{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","lessThan":"d5d99cb9e0839093cd53aa3b28176fce2f820ca0","status":"affected","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","lessThan":"13f3b3b87068898056db4c79ee67052fbde11d43","status":"affected","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","lessThan":"accc3f8266d2a49881dbcf78c459477f4efa0ff3","status":"affected","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","lessThan":"fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7","status":"affected","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","lessThan":"aa6e33cd74ca4965f2bbcb025e0b672fb0168a69","status":"affected","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","lessThan":"7ac345a93af31358e18e9606eb7b354691bf6757","status":"affected","versionType":"git"},{"version":"1b2b03f8e514e4f68e293846ba511a948b80243c","lessThan":"8175dbf174d487afab81e936a862a8d9b8a1ccb6","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/isdn/mISDN/timerdev.c"],"versions":[{"version":"2.6.27","status":"affected"},{"version":"0","lessThan":"2.6.27","status":"unaffected","versionType":"semver"},{"version":"5.10.249","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.199","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.162","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.122","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.68","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.8","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19","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:*:*:*:*:*:*:*:*","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"}]}]}],"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->work","x_generator":{"engine":"bippy-1.2.0"}}}}