# CVE-2026-23121: linux: In the Linux kernel, the following vulnerability has been resolved: mISDN: annotate data-race around dev->work dev-... CVE-2026-23121 is fixed in 35 products on 1 platform, first by DEBIAN-CVE-2026-23121, released February 14, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-23121 - Priority: Routine - CVSS: 5.5 (medium) - EPSS: 0.0011 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Feb 14, 2026 ## Description 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 ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | bpftool ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | dtb-aarch64 opensuse-leap 16.0 | 6.12.0-160000.27.1 | [OPENSUSE-SU-2026:20416-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20416-1.md) | Mar 25, 2026 | | Linux | kernel-64kb opensuse-leap 16.0 | 6.12.0-160000.27.1 | [OPENSUSE-SU-2026:20416-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20416-1.md) | Mar 25, 2026 | | Linux | kernel-64kb sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 | | Linux | kernel-64kb sles 16.0 | 6.12.0-160000.27.1 | [SUSE-SU-2026:20931-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20931-1.md) | Mar 25, 2026 | | Linux | kernel-azure opensuse-leap 16.0 | 6.12.0-160000.27.1 | [OPENSUSE-SU-2026:20416-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20416-1.md) | Mar 25, 2026 | | Linux | kernel-azure sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 | | Linux | kernel-azure sles 16.0 | 6.12.0-160000.27.1 | [SUSE-SU-2026:20931-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20931-1.md) | Mar 25, 2026 | | Linux | kernel-default opensuse-leap 16.0 | 6.12.0-160000.27.1 | [OPENSUSE-SU-2026:20416-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20416-1.md) | Mar 25, 2026 | | Linux | kernel-default sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 | | Linux | kernel-default sles 16.0 | 6.12.0-160000.27.1 | [SUSE-SU-2026:20931-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20931-1.md) | Mar 25, 2026 | | Linux | kernel-default-base opensuse-leap 16.0 | 6.12.0-160000.27.1.160000.2.8 | [OPENSUSE-SU-2026:20416-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20416-1.md) | Mar 25, 2026 | | Linux | kernel-default-base sles 15.7 | 6.4.0-150700.53.34.1.150700.17.23.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 | | Linux | kernel-default-base sles 16.0 | 6.12.0-160000.27.1.160000.2.8 | [SUSE-SU-2026:20931-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20931-1.md) | Mar 25, 2026 | | Linux | kernel-docs opensuse-leap 16.0 | 6.12.0-160000.27.1 | [OPENSUSE-SU-2026:20416-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20416-1.md) | Mar 25, 2026 | | Linux | kernel-docs sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 | | Linux | kernel-docs sles 16.0 | 6.12.0-160000.27.1 | [SUSE-SU-2026:20931-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20931-1.md) | Mar 25, 2026 | | Linux | kernel-kvmsmall opensuse-leap 16.0 | 6.12.0-160000.27.1 | [OPENSUSE-SU-2026:20416-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20416-1.md) | Mar 25, 2026 | | Linux | kernel-kvmsmall sles 16.0 | 6.12.0-160000.27.1 | [SUSE-SU-2026:20931-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20931-1.md) | Mar 25, 2026 | | Linux | kernel-livepatch-SLE15-SP7-RT_Update_10 sles 15.7 | 1-150700.1.3.1 | [SUSE-SU-2026:0962-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0962-1.md) | Mar 23, 2026 | | Linux | kernel-livepatch-SLE15-SP7_Update_10 sles 15.7 | 1-150700.15.3.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 | | Linux | kernel-obs-build opensuse-leap 16.0 | 6.12.0-160000.27.1 | [OPENSUSE-SU-2026:20416-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20416-1.md) | Mar 25, 2026 | | Linux | kernel-obs-build sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 | | Linux | kernel-obs-qa opensuse-leap 16.0 | 6.12.0-160000.27.1 | [OPENSUSE-SU-2026:20416-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20416-1.md) | Mar 25, 2026 | | Linux | kernel-obs-qa sles 16.0 | 6.12.0-160000.27.1 | [SUSE-SU-2026:20931-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20931-1.md) | Mar 25, 2026 | | Linux | kernel-rt opensuse-leap 16.0 | 6.12.0-160000.27.1 | [OPENSUSE-SU-2026:20416-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20416-1.md) | Mar 25, 2026 | | Linux | kernel-source opensuse-leap 16.0 | 6.12.0-160000.27.1 | [OPENSUSE-SU-2026:20416-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20416-1.md) | Mar 25, 2026 | | Linux | kernel-source sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 | | Linux | kernel-source sles 16.0 | 6.12.0-160000.27.1 | [SUSE-SU-2026:20931-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20931-1.md) | Mar 25, 2026 | | Linux | kernel-syms opensuse-leap 16.0 | 6.12.0-160000.27.1 | [OPENSUSE-SU-2026:20416-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20416-1.md) | Mar 25, 2026 | | Linux | kernel-syms sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 | | Linux | kernel-syms sles 16.0 | 6.12.0-160000.27.1 | [SUSE-SU-2026:20931-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20931-1.md) | Mar 25, 2026 | | Linux | kernel-uek ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-container ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-container ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-container-debug ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-container-debug ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-core ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-core ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-debug ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-debug ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-debug-core ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-debug-core ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-debug-devel ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-debug-devel ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-debug-modules ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-debug-modules ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-debug-modules-extra ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-debug-modules-extra ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-devel ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-devel ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-doc ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-doc ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-modules ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-modules ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-modules-extra ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek-modules-extra ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek64k ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek64k ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek64k-core ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek64k-core ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek64k-devel ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek64k-devel ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek64k-modules ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek64k-modules ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek64k-modules-extra ol 8 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-uek64k-modules-extra ol 9 | 0:5.15.0-318.199.3.2.el9uek | [ELSA-2026-50145](https://patchblox.com/security/data/fix/linux/elsa-2026-50145.md) | Mar 10, 2026 | | Linux | kernel-zfcpdump opensuse-leap 16.0 | 6.12.0-160000.27.1 | [OPENSUSE-SU-2026:20416-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20416-1.md) | Mar 25, 2026 | | Linux | kernel-zfcpdump sles 15.7 | 6.4.0-150700.53.34.1 | [SUSE-SU-2026:1081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-1081-1.md) | Mar 26, 2026 | | Linux | kernel-zfcpdump sles 16.0 | 6.12.0-160000.27.1 | [SUSE-SU-2026:20931-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20931-1.md) | Mar 25, 2026 | | Linux | linux Debian 12.15 (bookworm) | 6.1.162-1 | [DEBIAN-CVE-2026-23121](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23121.md) | Feb 14, 2026 | | Linux | linux Debian 13.5 (trixie) | 6.12.69-1 | [DEBIAN-CVE-2026-23121](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23121.md) | Feb 14, 2026 | | Linux | linux Debian 14 | 6.18.8-1 | [DEBIAN-CVE-2026-23121](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23121.md) | Feb 14, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. 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