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CVE-2025-68367 (GCVE-0-2025-68367)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:32 – Updated: 2026-05-11 21:51
VLAI
Title
macintosh/mac_hid: fix race condition in mac_hid_toggle_emumouse
Summary
In the Linux kernel, the following vulnerability has been resolved: macintosh/mac_hid: fix race condition in mac_hid_toggle_emumouse The following warning appears when running syzkaller, and this issue also exists in the mainline code. ------------[ cut here ]------------ list_add double add: new=ffffffffa57eee28, prev=ffffffffa57eee28, next=ffffffffa5e63100. WARNING: CPU: 0 PID: 1491 at lib/list_debug.c:35 __list_add_valid_or_report+0xf7/0x130 Modules linked in: CPU: 0 PID: 1491 Comm: syz.1.28 Not tainted 6.6.0+ #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP: 0010:__list_add_valid_or_report+0xf7/0x130 RSP: 0018:ff1100010dfb7b78 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffffffffa57eee18 RCX: ffffffff97fc9817 RDX: 0000000000040000 RSI: ffa0000002383000 RDI: 0000000000000001 RBP: ffffffffa57eee28 R08: 0000000000000001 R09: ffe21c0021bf6f2c R10: 0000000000000001 R11: 6464615f7473696c R12: ffffffffa5e63100 R13: ffffffffa57eee28 R14: ffffffffa57eee28 R15: ff1100010dfb7d48 FS: 00007fb14398b640(0000) GS:ff11000119600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000010d096005 CR4: 0000000000773ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 80000000 Call Trace: <TASK> input_register_handler+0xb3/0x210 mac_hid_start_emulation+0x1c5/0x290 mac_hid_toggle_emumouse+0x20a/0x240 proc_sys_call_handler+0x4c2/0x6e0 new_sync_write+0x1b1/0x2d0 vfs_write+0x709/0x950 ksys_write+0x12a/0x250 do_syscall_64+0x5a/0x110 entry_SYSCALL_64_after_hwframe+0x78/0xe2 The WARNING occurs when two processes concurrently write to the mac-hid emulation sysctl, causing a race condition in mac_hid_toggle_emumouse(). Both processes read old_val=0, then both try to register the input handler, leading to a double list_add of the same handler. CPU0 CPU1 ------------------------- ------------------------- vfs_write() //write 1 vfs_write() //write 1 proc_sys_write() proc_sys_write() mac_hid_toggle_emumouse() mac_hid_toggle_emumouse() old_val = *valp // old_val=0 old_val = *valp // old_val=0 mutex_lock_killable() proc_dointvec() // *valp=1 mac_hid_start_emulation() input_register_handler() mutex_unlock() mutex_lock_killable() proc_dointvec() mac_hid_start_emulation() input_register_handler() //Trigger Warning mutex_unlock() Fix this by moving the old_val read inside the mutex lock region.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 99b089c3c38a83ebaeb1cc4584ddcde841626467 , < d5f1d40fd342b589420de7508b4c748fcf28122e (git)
Affected: 99b089c3c38a83ebaeb1cc4584ddcde841626467 , < 14c209835e47a87e6da94bb9401e570dcc14f31f (git)
Affected: 99b089c3c38a83ebaeb1cc4584ddcde841626467 , < 583d36523f56d8e9ddfa0bec20743a6faefc9b74 (git)
Affected: 99b089c3c38a83ebaeb1cc4584ddcde841626467 , < 61abf8c3162d155b4fd0fb251f08557093363a0a (git)
Affected: 99b089c3c38a83ebaeb1cc4584ddcde841626467 , < 230621ffdb361d15cd3ef92d8b4fa8d314f4fad4 (git)
Affected: 99b089c3c38a83ebaeb1cc4584ddcde841626467 , < 388391dd1cc567fcf0b372b63d414c119d23e911 (git)
Affected: 99b089c3c38a83ebaeb1cc4584ddcde841626467 , < 48a7d427eb65922b3f17fbe00e2bbc7cb9eac381 (git)
Affected: 99b089c3c38a83ebaeb1cc4584ddcde841626467 , < 1e4b207ffe54cf33a4b7a2912c4110f89c73bf3f (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.34
Unaffected: 0 , < 2.6.34 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.63 , ≤ 6.12.* (semver)
Unaffected: 6.17.13 , ≤ 6.17.* (semver)
Unaffected: 6.18.2 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacintosh/mac_hid: fix race condition in mac_hid_toggle_emumouse\n\nThe following warning appears when running syzkaller, and this issue also\nexists in the mainline code.\n\n ------------[ cut here ]------------\n list_add double add: new=ffffffffa57eee28, prev=ffffffffa57eee28, next=ffffffffa5e63100.\n WARNING: CPU: 0 PID: 1491 at lib/list_debug.c:35 __list_add_valid_or_report+0xf7/0x130\n Modules linked in:\n CPU: 0 PID: 1491 Comm: syz.1.28 Not tainted 6.6.0+ #3\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\n RIP: 0010:__list_add_valid_or_report+0xf7/0x130\n RSP: 0018:ff1100010dfb7b78 EFLAGS: 00010282\n RAX: 0000000000000000 RBX: ffffffffa57eee18 RCX: ffffffff97fc9817\n RDX: 0000000000040000 RSI: ffa0000002383000 RDI: 0000000000000001\n RBP: ffffffffa57eee28 R08: 0000000000000001 R09: ffe21c0021bf6f2c\n R10: 0000000000000001 R11: 6464615f7473696c R12: ffffffffa5e63100\n R13: ffffffffa57eee28 R14: ffffffffa57eee28 R15: ff1100010dfb7d48\n FS:  00007fb14398b640(0000) GS:ff11000119600000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000000 CR3: 000000010d096005 CR4: 0000000000773ef0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n PKRU: 80000000\n Call Trace:\n  \u003cTASK\u003e\n  input_register_handler+0xb3/0x210\n  mac_hid_start_emulation+0x1c5/0x290\n  mac_hid_toggle_emumouse+0x20a/0x240\n  proc_sys_call_handler+0x4c2/0x6e0\n  new_sync_write+0x1b1/0x2d0\n  vfs_write+0x709/0x950\n  ksys_write+0x12a/0x250\n  do_syscall_64+0x5a/0x110\n  entry_SYSCALL_64_after_hwframe+0x78/0xe2\n\nThe WARNING occurs when two processes concurrently write to the mac-hid\nemulation sysctl, causing a race condition in mac_hid_toggle_emumouse().\nBoth processes read old_val=0, then both try to register the input handler,\nleading to a double list_add of the same handler.\n\n  CPU0                             CPU1\n  -------------------------        -------------------------\n  vfs_write() //write 1            vfs_write()  //write 1\n    proc_sys_write()                 proc_sys_write()\n      mac_hid_toggle_emumouse()          mac_hid_toggle_emumouse()\n        old_val = *valp // old_val=0\n                                           old_val = *valp // old_val=0\n                                           mutex_lock_killable()\n                                           proc_dointvec() // *valp=1\n                                           mac_hid_start_emulation()\n                                             input_register_handler()\n                                           mutex_unlock()\n        mutex_lock_killable()\n        proc_dointvec()\n        mac_hid_start_emulation()\n          input_register_handler() //Trigger Warning\n        mutex_unlock()\n\nFix this by moving the old_val read inside the mutex lock region."
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          "url": "https://git.kernel.org/stable/c/d5f1d40fd342b589420de7508b4c748fcf28122e"
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          "url": "https://git.kernel.org/stable/c/14c209835e47a87e6da94bb9401e570dcc14f31f"
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        },
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        {
          "url": "https://git.kernel.org/stable/c/1e4b207ffe54cf33a4b7a2912c4110f89c73bf3f"
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      ],
      "title": "macintosh/mac_hid: fix race condition in mac_hid_toggle_emumouse",
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    "cveId": "CVE-2025-68367",
    "datePublished": "2025-12-24T10:32:54.084Z",
    "dateReserved": "2025-12-16T14:48:05.309Z",
    "dateUpdated": "2026-05-11T21:51:50.117Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2025-68367",
      "date": "2026-09-16",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68367\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T11:16:00.267\",\"lastModified\":\"2026-06-17T09:59:00.657\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmacintosh/mac_hid: fix race condition in mac_hid_toggle_emumouse\\n\\nThe following warning appears when running syzkaller, and this issue also\\nexists in the mainline code.\\n\\n ------------[ cut here ]------------\\n list_add double add: new=ffffffffa57eee28, prev=ffffffffa57eee28, next=ffffffffa5e63100.\\n WARNING: CPU: 0 PID: 1491 at lib/list_debug.c:35 __list_add_valid_or_report+0xf7/0x130\\n Modules linked in:\\n CPU: 0 PID: 1491 Comm: syz.1.28 Not tainted 6.6.0+ #3\\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\\n RIP: 0010:__list_add_valid_or_report+0xf7/0x130\\n RSP: 0018:ff1100010dfb7b78 EFLAGS: 00010282\\n RAX: 0000000000000000 RBX: ffffffffa57eee18 RCX: ffffffff97fc9817\\n RDX: 0000000000040000 RSI: ffa0000002383000 RDI: 0000000000000001\\n RBP: ffffffffa57eee28 R08: 0000000000000001 R09: ffe21c0021bf6f2c\\n R10: 0000000000000001 R11: 6464615f7473696c R12: ffffffffa5e63100\\n R13: ffffffffa57eee28 R14: ffffffffa57eee28 R15: ff1100010dfb7d48\\n FS:  00007fb14398b640(0000) GS:ff11000119600000(0000) knlGS:0000000000000000\\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n CR2: 0000000000000000 CR3: 000000010d096005 CR4: 0000000000773ef0\\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\n PKRU: 80000000\\n Call Trace:\\n  \u003cTASK\u003e\\n  input_register_handler+0xb3/0x210\\n  mac_hid_start_emulation+0x1c5/0x290\\n  mac_hid_toggle_emumouse+0x20a/0x240\\n  proc_sys_call_handler+0x4c2/0x6e0\\n  new_sync_write+0x1b1/0x2d0\\n  vfs_write+0x709/0x950\\n  ksys_write+0x12a/0x250\\n  do_syscall_64+0x5a/0x110\\n  entry_SYSCALL_64_after_hwframe+0x78/0xe2\\n\\nThe WARNING occurs when two processes concurrently write to the mac-hid\\nemulation sysctl, causing a race condition in mac_hid_toggle_emumouse().\\nBoth processes read old_val=0, then both try to register the input handler,\\nleading to a double list_add of the same handler.\\n\\n  CPU0                             CPU1\\n  -------------------------        -------------------------\\n  vfs_write() //write 1            vfs_write()  //write 1\\n    proc_sys_write()                 proc_sys_write()\\n      mac_hid_toggle_emumouse()          mac_hid_toggle_emumouse()\\n        old_val = *valp // old_val=0\\n                                           old_val = *valp // old_val=0\\n                                           mutex_lock_killable()\\n                                           proc_dointvec() // *valp=1\\n                                           mac_hid_start_emulation()\\n                                             input_register_handler()\\n                                           mutex_unlock()\\n        mutex_lock_killable()\\n        proc_dointvec()\\n        mac_hid_start_emulation()\\n          input_register_handler() //Trigger Warning\\n        mutex_unlock()\\n\\nFix this by moving the old_val read inside the mutex lock region.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/macintosh/mac_hid.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"99b089c3c38a83ebaeb1cc4584ddcde841626467\",\"lessThan\":\"d5f1d40fd342b589420de7508b4c748fcf28122e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99b089c3c38a83ebaeb1cc4584ddcde841626467\",\"lessThan\":\"14c209835e47a87e6da94bb9401e570dcc14f31f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99b089c3c38a83ebaeb1cc4584ddcde841626467\",\"lessThan\":\"583d36523f56d8e9ddfa0bec20743a6faefc9b74\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99b089c3c38a83ebaeb1cc4584ddcde841626467\",\"lessThan\":\"61abf8c3162d155b4fd0fb251f08557093363a0a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99b089c3c38a83ebaeb1cc4584ddcde841626467\",\"lessThan\":\"230621ffdb361d15cd3ef92d8b4fa8d314f4fad4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99b089c3c38a83ebaeb1cc4584ddcde841626467\",\"lessThan\":\"388391dd1cc567fcf0b372b63d414c119d23e911\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99b089c3c38a83ebaeb1cc4584ddcde841626467\",\"lessThan\":\"48a7d427eb65922b3f17fbe00e2bbc7cb9eac381\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"99b089c3c38a83ebaeb1cc4584ddcde841626467\",\"lessThan\":\"1e4b207ffe54cf33a4b7a2912c4110f89c73bf3f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/macintosh/mac_hid.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.34\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.34\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.248\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.198\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.160\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.120\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.63\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17.13\",\"lessThanOrEqual\":\"6.17.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.2\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/14c209835e47a87e6da94bb9401e570dcc14f31f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1e4b207ffe54cf33a4b7a2912c4110f89c73bf3f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/230621ffdb361d15cd3ef92d8b4fa8d314f4fad4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/388391dd1cc567fcf0b372b63d414c119d23e911\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/48a7d427eb65922b3f17fbe00e2bbc7cb9eac381\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/583d36523f56d8e9ddfa0bec20743a6faefc9b74\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/61abf8c3162d155b4fd0fb251f08557093363a0a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d5f1d40fd342b589420de7508b4c748fcf28122e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T01:43:51+00:00",
      "cve": "CVE-2025-68367",
      "id": "CVE-2025-68367",
      "initial_release_date": "2025-12-24T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel (macintosh/mac_hid): Denial of Service via race condition in mac_hid_toggle_emumouse",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68367.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:49:42Z",
      "cve": "CVE-2025-68367",
      "id": "CVE-2025-68367",
      "initial_release_date": "2025-12-25T00:24:18Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "817",
      "product_status:recommended": "318",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-68367",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-68367.json",
      "version": "33"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.