CVE-2025-40271
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk33th percentile - higher than 33% of all known CVEs
Summary
W jądrze systemu Linux zidentyfikowano podatność typu use-after-free (UAF) w funkcji proc_readdir_de(). Problem polega na tym, że węzeł został usunięty z drzewa rbtree, ale nie został oznaczony jako pusty, co może prowadzić do dostępu do zwolnionego obiektu.
Risk Assessment
Wykorzystanie tej podatności może prowadzić do nieprzewidywalnych zachowań systemu, w tym potencjalnych awarii lub naruszeń bezpieczeństwa, co stanowi zagrożenie dla stabilności i integralności systemu.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, w której ta podatność została naprawiona, aby zminimalizować ryzyko związane z dostępem do zwolnionych obiektów.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: fs/proc: fix uaf in proc_readdir_de() Pde is erased from subdir rbtree through rb_erase(), but not set the node to EMPTY, which may result in uaf access. We should use RB_CLEAR_NODE() set the erased node to EMPTY, then pde_subdir_next() will return NULL to avoid uaf access. We found an uaf issue while using stress-ng testing, need to run testcase getdent and tun in the same time. The steps of the issue is as follows: 1) use getdent to traverse dir /proc/pid/net/dev_snmp6/, and current pde is tun3; 2) in the [time windows] unregister netdevice tun3 and tun2, and erase them from rbtree. erase tun3 first, and then erase tun2. the pde(tun2) will be released to slab; 3) continue to getdent process, then pde_subdir_next() will return pde(tun2) which is released, it will case uaf access. CPU 0 | CPU 1 ------------------------------------------------------------------------- traverse dir /proc/pid/net/dev_snmp6/ | unregister_netdevice(tun->dev) //tun3 tun2 sys_getdents64() | iterate_dir() | proc_readdir() | proc_readdir_de() | snmp6_unregister_dev() pde_get(de); | proc_remove() read_unlock(&proc_subdir_lock); | remove_proc_subtree() | write_lock(&proc_subdir_lock); [time window] | rb_erase(&root->subdir_node, &parent->subdir); | write_unlock(&proc_subdir_lock); read_lock(&proc_subdir_lock); | next = pde_subdir_next(de); | pde_put(de); | de = next; //UAF | rbtree of dev_snmp6 | pde(tun3) / \ NULL pde(tun2)