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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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          "date": "2026-07-29T17:16:00Z",
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          "date": "2026-08-25T12:52:36Z",
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          "number": "4",
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        "relates_to_product_reference": "Debian-10"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "linux-cpupower-0:4.19.325-2+tuxcare.els1.amd64 as a component of Debian 10",
          "product_id": "Debian-10:linux-cpupower-0:4.19.325-2+tuxcare.els1.amd64"
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    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-64560",
      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nposix-cpu-timers: Prevent UAF caused by non-leader exec() race\n\nWongi and Jungwoo decoded and reported a non-leader exec() related race\nwhich can result in an UAF:\n\n sys_timer_delete()\t\t\texec()\n   posix_cpu_timer_del()\n   // Observes old leader\n   p = pid_task(pid, pid_type);\t\tde_thread()\n   \t\t\t\t\t  switch_leader();\n\t\t\t\t\t  release_task(old_leader)\n\t\t\t\t\t    __exit_signal(old_leader)\n\t\t\t\t\t      sighand = lock(old_leader, sighand);\n\t\t\t\t\t      posix_cpu_timers*_exit();\n   sighand = lock_task_sighand(p)\t      unhash_task(old_leader);\n     sh = lock(p, sighand)\t    \t      old_leader->sighand = NULL;\n\t\t\t\t\t      unlock(sighand);\n     (p->sighand == NULL)\n\tunlock(sh)\n\treturn NULL;\n\n   // Returns without action\n   if(!sighand)\n      return 0;\n   free_posix_timer();\n\nThis is \"harmless\" unless the deleted timer was armed and enqueued in\np->signal because on exec() a TGID targeted timer is inherited.\n\nAs sys_timer_delete() freed the underlying posix timer object\nrun_posix_cpu_timers() or any timerqueue related add/delete operations on\nother timers will access the freed object's timerqueue node, which results\nin an UAF.\n\nThere is a similar problem vs. posix_cpu_timer_set(). For regular posix\ntimers it just transiently returns -ESRCH to user space, but for the use\ncase in do_cpu_nanosleep() it's the same UAF just that the k_itimer is\nallocated on the stack.\n\nAlso posix_cpu_timer_rearm() fails to rearm the timer, which means it stops\nto expire.\n\nWhile debating solutions Frederic pointed out another problem:\n\n   posix_cpu_timer_del(tmr)\n\t\t\t\t\t__exit_signal(p)\n\t\t\t\t\t  posix_cpu_timers*_exit(p);\n\t\t\t\t\t  unhash_task(p);\n\t\t\t\t\t  p->sighand = NULL;\n     sh = lock_task_sighand(p)\n        sighand = p->sighand;\n\tif (!sighand)\n\t    return NULL;\n\tlock(sighand);\n\n     if (!sh)\n\tWARN_ON_ONCE(timer_queued(tmr));\n\nOn weakly ordered architectures it is not guaranteed that\nposix_cpu_timer_del() will observe the stores in posix_cpu_timers*_exit()\nwhen p->sighand is observed as NULL, which means the WARN() can be a false\npositive.\n\nSolve these issues by:\n\n  1) Changing the store in __exit_signal() to smp_store_release().\n\n  2) Adding a smp_acquire__after_ctrl_dep() into the !sighand path\n     of lock_task_sighand().\n\n  3) Creating a helper function for looking up the task and locking sighand\n     which does not return when sighand == NULL. Instead it retries the\n     task lookup and only if that fails it gives up.\n\n  4) Using that helper in the three affected functions.\n\n#1/#2 ensures that the reader side which observes sighand == NULL also\nobserves all preceeding stores, i.e. the stores in posix_cpu_timers*_exit()\nand the ones in unhash_task().\n\n#3 ensures that the above described non-leader exec() situation is handled\ngracefully. When the task lookup returns the old leader, but sighand ==\nNULL then it retries. In the non-leader exec() case the subsequent task\nlookup will observe the new leader due to #1/#2. In normal exit() scenarios\nthe subsequent lookup fails.\n\nWhen the task lookup fails, the function also checks whether the timer is\nstill enqueued and issues a warning if that's the case. Unfortunately there\nis nothing which can be done about it, but as the task is already not\nlonger visible the timer should not be accessed anymore. This check also\nrequires memory ordering, which is not provided when the first lookup\nfails. To achieve that the check is preceeded by a smp_rmb() which pairs\nwith the smp_wmb() in write_seqlock() in __exit_signal(). That ensures that\nthe stores in posix_cpu_timers*_exit() are visible.\n\nThe history of the non-leader exec() issue goes back to the early days of\nposix CPU timers, which stored a pointer to the group leader task in the\ntimer. That obviously fails when a non-leader exec() switches the leader.\ncommit e0a70217107e (\"posix-cpu-timers: workaround to suppress the problems\nwith mt exec\") added a temporary workaround for that in 2010 which surv\n---truncated---",
          "title": "Vulnerability description"
        },
        {
          "category": "other",
          "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.",
          "title": "Statement"
        }
      ],
      "product_status": {
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-64560"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/12a891c773aeb5823d63dbd0cb2ab931d6c21c9b",
          "url": "https://git.kernel.org/stable/c/12a891c773aeb5823d63dbd0cb2ab931d6c21c9b"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/67aa823e3e8c229c6d374df79c804f6721cb83b6",
          "url": "https://git.kernel.org/stable/c/67aa823e3e8c229c6d374df79c804f6721cb83b6"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/6a7ecc25abe6f0fecc6e62a05096987200edbd02",
          "url": "https://git.kernel.org/stable/c/6a7ecc25abe6f0fecc6e62a05096987200edbd02"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/920f893f735e92ba3a1cd9256899a186b161928d",
          "url": "https://git.kernel.org/stable/c/920f893f735e92ba3a1cd9256899a186b161928d"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/ad1cafa1bdaa71da85d71cac053838bbe97852b6",
          "url": "https://git.kernel.org/stable/c/ad1cafa1bdaa71da85d71cac053838bbe97852b6"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/cc35ddbc497311e0b6b9a6a6a4f4d1217d6ab1aa",
          "url": "https://git.kernel.org/stable/c/cc35ddbc497311e0b6b9a6a6a4f4d1217d6ab1aa"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/d8bcb28abad857f1415da7656f19b2ada90af04f",
          "url": "https://git.kernel.org/stable/c/d8bcb28abad857f1415da7656f19b2ada90af04f"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/e74443f5db0037c556ef436fa64b88bf4ea08f83",
          "url": "https://git.kernel.org/stable/c/e74443f5db0037c556ef436fa64b88bf4ea08f83"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
        }
      ],
      "release_date": "2026-07-29T17:16:00Z",
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        },
        {
          "category": "impact",
          "date": "2026-08-22T13:45:02.201165Z",
          "details": "CVE-2026-64560 does not affect debian10els. The flaw is a use-after-free race in POSIX CPU timers during a non-leader exec(), reachable through the pid-based timer-to-task lookup. This kernel predates that design: it stores a direct task reference in the timer rather than a pid, and upstream attributes the flaw to the v5.7 conversion to pid-based storage, so the vulnerable code was never introduced.",
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