CVE-2026-23121

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> mISDN: annotate data-race around dev-&gt;work<br /> <br /> dev-&gt;work can re read locklessly in mISDN_read()<br /> and mISDN_poll(). Add READ_ONCE()/WRITE_ONCE() annotations.<br /> <br /> BUG: KCSAN: data-race in mISDN_ioctl / mISDN_read<br /> <br /> write to 0xffff88812d848280 of 4 bytes by task 10864 on cpu 1:<br /> misdn_add_timer drivers/isdn/mISDN/timerdev.c:175 [inline]<br /> mISDN_ioctl+0x2fb/0x550 drivers/isdn/mISDN/timerdev.c:233<br /> vfs_ioctl fs/ioctl.c:51 [inline]<br /> __do_sys_ioctl fs/ioctl.c:597 [inline]<br /> __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583<br /> __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583<br /> x64_sys_call+0x14b0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:17<br /> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]<br /> do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> read to 0xffff88812d848280 of 4 bytes by task 10857 on cpu 0:<br /> mISDN_read+0x1f2/0x470 drivers/isdn/mISDN/timerdev.c:112<br /> do_loop_readv_writev fs/read_write.c:847 [inline]<br /> vfs_readv+0x3fb/0x690 fs/read_write.c:1020<br /> do_readv+0xe7/0x210 fs/read_write.c:1080<br /> __do_sys_readv fs/read_write.c:1165 [inline]<br /> __se_sys_readv fs/read_write.c:1162 [inline]<br /> __x64_sys_readv+0x45/0x50 fs/read_write.c:1162<br /> x64_sys_call+0x2831/0x3000 arch/x86/include/generated/asm/syscalls_64.h:20<br /> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]<br /> do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> value changed: 0x00000000 -&gt; 0x00000001