{"id":"CVE-2026-23121","summary":"mISDN: annotate data-race around dev-\u003ework","details":"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","modified":"2026-04-02T17:30:11.781236707Z","published":"2026-02-14T15:09:51.912Z","related":["SUSE-SU-2026:0962-1","SUSE-SU-2026:1081-1","SUSE-SU-2026:20667-1","SUSE-SU-2026:20720-1","SUSE-SU-2026:20838-1","SUSE-SU-2026:20845-1","SUSE-SU-2026:20876-1","SUSE-SU-2026:20931-1","openSUSE-SU-2026:20416-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23121.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/13f3b3b87068898056db4c79ee67052fbde11d43"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ac345a93af31358e18e9606eb7b354691bf6757"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8175dbf174d487afab81e936a862a8d9b8a1ccb6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aa6e33cd74ca4965f2bbcb025e0b672fb0168a69"},{"type":"WEB","url":"https://git.kernel.org/stable/c/accc3f8266d2a49881dbcf78c459477f4efa0ff3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d5d99cb9e0839093cd53aa3b28176fce2f820ca0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23121.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23121"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1b2b03f8e514e4f68e293846ba511a948b80243c"},{"fixed":"d5d99cb9e0839093cd53aa3b28176fce2f820ca0"},{"fixed":"13f3b3b87068898056db4c79ee67052fbde11d43"},{"fixed":"accc3f8266d2a49881dbcf78c459477f4efa0ff3"},{"fixed":"fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7"},{"fixed":"aa6e33cd74ca4965f2bbcb025e0b672fb0168a69"},{"fixed":"7ac345a93af31358e18e9606eb7b354691bf6757"},{"fixed":"8175dbf174d487afab81e936a862a8d9b8a1ccb6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-23121.json"}}],"schema_version":"1.7.5"}