CVE-2026-43071
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk33th percentile - higher than 33% of all known CVEs
Summary
W jądrze systemu Linux zidentyfikowano podatność związana z odczytem poza granicami (OOB) w dentry_hashtable, gdy użytkownik ustawia 'dhash_entries=1'. Problem ten prowadzi do błędu strony w trybie jądra, co może skutkować nieprzewidzianym dostępem do pamięci.
Risk Assessment
Podatność ta może prowadzić do awarii systemu lub nieautoryzowanego dostępu do pamięci, co stwarza poważne zagrożenie dla stabilności i bezpieczeństwa systemu operacyjnego.
Recommendation
Zaleca się aktualizację jądra systemu Linux do wersji, w której ograniczono minimalną liczbę kubełków w dentry_hashtable do dwóch, aby zapobiec wystąpieniu tego problemu.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: dcache: Limit the minimal number of bucket to two There is an OOB read problem on dentry_hashtable when user sets 'dhash_entries=1': BUG: unable to handle page fault for address: ffff888b30b774b0 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page Oops: Oops: 0000 [#1] SMP PTI RIP: 0010:__d_lookup+0x56/0x120 Call Trace: d_lookup.cold+0x16/0x5d lookup_dcache+0x27/0xf0 lookup_one_qstr_excl+0x2a/0x180 start_dirop+0x55/0xa0 simple_start_creating+0x8d/0xa0 debugfs_start_creating+0x8c/0x180 debugfs_create_dir+0x1d/0x1c0 pinctrl_init+0x6d/0x140 do_one_initcall+0x6d/0x3d0 kernel_init_freeable+0x39f/0x460 kernel_init+0x2a/0x260 There will be only one bucket in dentry_hashtable when dhash_entries is set as one, and d_hash_shift is calculated as 32 by dcache_init(). Then, following process will access more than one buckets(which memory region is not allocated) in dentry_hashtable: d_lookup b = d_hash(hash) dentry_hashtable + ((u32)hashlen >> d_hash_shift) // The C standard defines the behavior of right shift amounts // exceeding the bit width of the operand as undefined. The // result of '(u32)hashlen >> d_hash_shift' becomes 'hashlen', // so 'b' will point to an unallocated memory region. hlist_bl_for_each_entry_rcu(b) hlist_bl_first_rcu(head) h->first // read OOB! Fix it by limiting the minimal number of dentry_hashtable bucket to two, so that 'd_hash_shift' won't exceeds the bit width of type u32.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

