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CVE-2026-97938: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: reboot: fix cad_pid use-after-free race cad_pid is a single kernel-wide struct pid pointer. proc_do_cad_pid() reads it and passes it to pid_vnr() without protecting the lifetime of the referenced struct pid. A concurrent writer can replace cad_pid and drop the final reference to the old struct pid after the reader has loaded the pointer but before pid_vnr() has finished dereferencing it, causing a use-after-free. kill_cad_pid() has the same lifetime race when it passes cad_pid to kill_pid(). At the time this issue was reported, an unprivileged user could reach the sysctl through user and PID namespaces because cad_pid was registered in pid_table[]. Moving cad_pid back to the global reboot sysctl table corrected that namespace and permission mismatch, but did not fix the underlying lifetime race. Fix this by treating cad_pid as an RCU-protected pointer at both read sites and by waiting for a grace period before dropping the old reference on the write side. call_rcu(&old_pid->rcu, ...) cannot be used here because free_pid() also queues pid->rcu; queueing the same rcu_head twice can corrupt the RCU callback list. Original KASAN crash stack: kernel/pid.c:545 pid_nr_ns() # reads freed pid->level kernel/pid.c:556 pid_vnr() # calls pid_nr_ns() kernel/pid.c:775 proc_do_cad_pid() # calls pid_vnr(cad_pid)

    Засегнати продукти

    • Linux Linux: 9ec52099e4b8678a60e9f93e41ad87885d64f3e6 преди 0c1a966bc047af2801a70b8eb13f9df5d7ab925f; 9ec52099e4b8678a60e9f93e41ad87885d64f3e6 преди ae3e53fe3c1241855e3a88f74877738349948c78; 9ec52099e4b8678a60e9f93e41ad87885d64f3e6 преди ad72e2566643fff7f01666d845fb026898155e1f; 9ec52099e4b8678a60e9f93e41ad87885d64f3e6 преди 9a17b0e053197a6a42cdc75e75a35b17aa662088; 9ec52099e4b8678a60e9f93e41ad87885d64f3e6 преди 5a88f78df753993469dab4d1831f8fb4256a9468
    • Linux Linux: 2.6.19; преди 2.6.19; 6.6.160 до 6.6.*; 6.12.112 до 6.12.*; 6.18.53 до 6.18.*; 7.2.7 до 7.2.*; 7.3 до *

    История

    • 25 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-97938: Linux | freedomonline.bg