CVE-2026-23121 PUBLISHED

mISDN: annotate data-race around dev->work

Assigner: Linux
Reserved: 13.01.2026 Published: 14.02.2026 Updated: 14.02.2026

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

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 1b2b03f8e514e4f68e293846ba511a948b80243c to d5d99cb9e0839093cd53aa3b28176fce2f820ca0 (excl.)
  • affected from 1b2b03f8e514e4f68e293846ba511a948b80243c to 13f3b3b87068898056db4c79ee67052fbde11d43 (excl.)
  • affected from 1b2b03f8e514e4f68e293846ba511a948b80243c to accc3f8266d2a49881dbcf78c459477f4efa0ff3 (excl.)
  • affected from 1b2b03f8e514e4f68e293846ba511a948b80243c to fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7 (excl.)
  • affected from 1b2b03f8e514e4f68e293846ba511a948b80243c to aa6e33cd74ca4965f2bbcb025e0b672fb0168a69 (excl.)
  • affected from 1b2b03f8e514e4f68e293846ba511a948b80243c to 7ac345a93af31358e18e9606eb7b354691bf6757 (excl.)
  • affected from 1b2b03f8e514e4f68e293846ba511a948b80243c to 8175dbf174d487afab81e936a862a8d9b8a1ccb6 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 2.6.27 is affected
  • unaffected from 0 to 2.6.27 (excl.)
  • unaffected from 5.10.249 to 5.10.* (incl.)
  • unaffected from 5.15.199 to 5.15.* (incl.)
  • unaffected from 6.1.162 to 6.1.* (incl.)
  • unaffected from 6.6.122 to 6.6.* (incl.)
  • unaffected from 6.12.68 to 6.12.* (incl.)
  • unaffected from 6.18.8 to 6.18.* (incl.)
  • unaffected from 6.19 to * (incl.)

References