mISDN: annotate data-race around dev->work

{
  "id": "467fce69e7a7a7ffd84a67821e08245c6ddcb9f4d9ecefba15fb553e6452c7bd",
  "url": "https://osv.dev/vulnerability/CVE-2026-23121",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mISDN: annotate data-race around dev->work",
    "summary": "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",
    "evidence": "osv:CVE-2026-23121",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.249",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.199",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.162",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.122",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.68",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-23121",
      "aliases": [
        "CVE-2026-23121"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "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/cve-osv-conversion/osv-output/CVE-2026-23121.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.27"
                },
                {
                  "fixed": "5.10.249"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.199"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.162"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.122"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.68"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.8"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23121.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.266266675Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/13f3b3b87068898056db4c79ee67052fbde11d43",
        "https://git.kernel.org/stable/c/7ac345a93af31358e18e9606eb7b354691bf6757",
        "https://git.kernel.org/stable/c/8175dbf174d487afab81e936a862a8d9b8a1ccb6",
        "https://git.kernel.org/stable/c/aa6e33cd74ca4965f2bbcb025e0b672fb0168a69",
        "https://git.kernel.org/stable/c/accc3f8266d2a49881dbcf78c459477f4efa0ff3",
        "https://git.kernel.org/stable/c/d5d99cb9e0839093cd53aa3b28176fce2f820ca0",
        "https://git.kernel.org/stable/c/fc8ba17fd3337bd8b1913c30b95df0fee00d8fb7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23121.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23121",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23121.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23121",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493978,
  "published_at": "2026-02-14T15:09:51.912+00:00"
}