CVE-2026-23121

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2026
Source publication: Feb 14, 2026
Source updated: Oct 19, 2026
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

mISDN: annotate data-race around dev->work

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

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Linux

Vendor: Linux
Product: Linux
Platforms: Unknown
Default status: unaffected

Linux · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
1b2b03f8e514e4f68e293846ba511a948b80243c	`affected`	git	d5d99cb9e0839093cd53aa3b28176fce2f820ca0	Unavailable	None listed
1b2b03f8e514e4f68e293846ba511a948b80243c	`affected`	git	13f3b3b87068898056db4c79ee67052fbde11d43	Unavailable	None listed
1b2b03f8e514e4f68e293846ba511a948b80243c	`affected`	git	accc3f8266d2a49881dbcf78c459477f4efa0ff3	Unavailable	None listed
1b2b03f8e514e4f68e293846ba511a948b80243c	`affected`	git	fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7	Unavailable	None listed
1b2b03f8e514e4f68e293846ba511a948b80243c	`affected`	git	aa6e33cd74ca4965f2bbcb025e0b672fb0168a69	Unavailable	None listed
1b2b03f8e514e4f68e293846ba511a948b80243c	`affected`	git	7ac345a93af31358e18e9606eb7b354691bf6757	Unavailable	None listed
1b2b03f8e514e4f68e293846ba511a948b80243c	`affected`	git	8175dbf174d487afab81e936a862a8d9b8a1ccb6	Unavailable	None listed

Linux

Vendor: Linux
Product: Linux
Platforms: Unknown
Default status: affected

Linux · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
2.6.27	`affected`	Unavailable	Unavailable	Unavailable	None listed
0	`unaffected`	semver	2.6.27	Unavailable	None listed
5.10.249	`unaffected`	semver	Unavailable	5.10.*	None listed
5.15.199	`unaffected`	semver	Unavailable	5.15.*	None listed
6.1.162	`unaffected`	semver	Unavailable	6.1.*	None listed
6.6.122	`unaffected`	semver	Unavailable	6.6.*	None listed
6.12.68	`unaffected`	semver	Unavailable	6.12.*	None listed
6.18.8	`unaffected`	semver	Unavailable	6.18.*	None listed
6.19	`unaffected`	original_commit_for_fix	Unavailable	*	None listed