{"id":"CVE-2026-43071","summary":"dcache: Limit the minimal number of bucket to two","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndcache: Limit the minimal number of bucket to two\n\nThere is an OOB read problem on dentry_hashtable when user sets\n'dhash_entries=1':\n  BUG: unable to handle page fault for address: ffff888b30b774b0\n  #PF: supervisor read access in kernel mode\n  #PF: error_code(0x0000) - not-present page\n  Oops: Oops: 0000 [#1] SMP PTI\n  RIP: 0010:__d_lookup+0x56/0x120\n   Call Trace:\n    d_lookup.cold+0x16/0x5d\n    lookup_dcache+0x27/0xf0\n    lookup_one_qstr_excl+0x2a/0x180\n    start_dirop+0x55/0xa0\n    simple_start_creating+0x8d/0xa0\n    debugfs_start_creating+0x8c/0x180\n    debugfs_create_dir+0x1d/0x1c0\n    pinctrl_init+0x6d/0x140\n    do_one_initcall+0x6d/0x3d0\n    kernel_init_freeable+0x39f/0x460\n    kernel_init+0x2a/0x260\n\nThere will be only one bucket in dentry_hashtable when dhash_entries is\nset as one, and d_hash_shift is calculated as 32 by dcache_init(). Then,\nfollowing process will access more than one buckets(which memory region\nis not allocated) in dentry_hashtable:\n d_lookup\n  b = d_hash(hash)\n    dentry_hashtable + ((u32)hashlen \u003e\u003e d_hash_shift)\n    // The C standard defines the behavior of right shift amounts\n    // exceeding the bit width of the operand as undefined. The\n    // result of '(u32)hashlen \u003e\u003e d_hash_shift' becomes 'hashlen',\n    // so 'b' will point to an unallocated memory region.\n  hlist_bl_for_each_entry_rcu(b)\n   hlist_bl_first_rcu(head)\n    h-\u003efirst  // read OOB!\n\nFix it by limiting the minimal number of dentry_hashtable bucket to two,\nso that 'd_hash_shift' won't exceeds the bit width of type u32.","modified":"2026-10-28T02:31:13.128487410Z","published":"2026-05-05T15:29:28.081Z","related":["openSUSE-SU-2026:10793-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43071.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html"},{"type":"WEB","url":"https://git.kernel.org/stable/c/277cedabb0ab86baae83fa58218be13c6d3e5526"},{"type":"WEB","url":"https://git.kernel.org/stable/c/426ef05e82ee52c8d0e95fc0808b7383d8352d73"},{"type":"WEB","url":"https://git.kernel.org/stable/c/45b06bb5ea96f75ad81d7ef446f832ea6b0026fe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5718df131ab78897a9dd1f2e71c3ba732d4392af"},{"type":"WEB","url":"https://git.kernel.org/stable/c/755b40903eff563768d4d96fd4ef51ec48adde3b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ddd57ebce245f9c7e2f6902a6c087d6186d2385d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f08fe8891c3eeb63b73f9f1f6d97aa629c821579"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43071.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43071"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"99d263d4c5b2f541dfacb5391e22e8c91ea982a6"},{"fixed":"45b06bb5ea96f75ad81d7ef446f832ea6b0026fe"},{"fixed":"426ef05e82ee52c8d0e95fc0808b7383d8352d73"},{"fixed":"ddd57ebce245f9c7e2f6902a6c087d6186d2385d"},{"fixed":"755b40903eff563768d4d96fd4ef51ec48adde3b"},{"fixed":"5718df131ab78897a9dd1f2e71c3ba732d4392af"},{"fixed":"277cedabb0ab86baae83fa58218be13c6d3e5526"},{"fixed":"f08fe8891c3eeb63b73f9f1f6d97aa629c821579"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.10.55"},{"fixed":"3.11"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.12.29"},{"fixed":"3.13"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.14.19"},{"fixed":"3.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.16.3"},{"fixed":"3.17"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d4c96061fddd129778ce8b70fb093aa532f422d0"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"be2378cbffe50ce0161f0fdee914adee98af53dc"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a8be8af18485f9fade90e1743d940252a39eec84"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b5cf3193759f7cd1cfbeef11f5cf067bbce22e55"}]}],"versions":["v6.1.174","v6.1.173","v7.0","v6.1.172","v6.1.171","v6.1.170","v7.0-rc1","v6.1.169","v6.6.135","v6.19.13","v6.18.23","v6.12.82","v6.19.12","v6.18.22","v6.12.81","v6.6.134","v6.1.168","v7.0-rc5","v7.0-rc6","v6.19.11","v6.18.21","v6.12.80","v6.6.133","v6.1.167","v7.0-rc7","v7.0-rc3","v7.0-rc4","v6.6.132","v6.19-rc2","v6.6.131","v6.19.10","v6.18.20","v6.12.79","v6.6.130","v7.0-rc2","v6.19","v6.12.78","v6.19.9","v6.18.19","v6.12.77","v6.6.129","v6.1.166","v6.19.8","v6.18.18","v6.19.7","v6.18.17","v6.12.76","v6.18.16","v6.19.6","v6.1.165","v6.6.128","v6.12.75","v6.18.15","v6.19.5","v6.6.127","v6.12.74","v6.1.164","v6.19.4","v6.18.14","v6.19.3","v6.18.13","v6.19.2","v6.18.12","v6.12.73","v6.6.126","v6.1.163","v6.19.1","v6.18.11","v6.12.72","v6.6.125","v6.18.10","v6.12.71","v6.6.124","v6.12.70","v6.18.9","v6.12.69","v6.6.123","v6.1.162","v6.19-rc8","v6.19-rc1","v6.19-rc6","v6.18.8","v6.12.68","v6.6.122","v6.1.161","v6.19-rc7","v6.19-rc5","v6.19-rc4","v6.18.7","v6.12.67","v6.6.121","v6.19-rc3","v6.18.6","v6.12.66","v6.1.160","v6.18.5","v6.12.65","v6.6.120","v6.18.4","v6.12.64","v6.6.119","v6.1.159","v6.18.3","v6.12.63","v6.18.2","v6.18.1","v6.12.62","v6.18","v6.12.61","v6.18-rc1","v6.12.60","v6.6.118","v6.1.158","v6.18-rc7","v6.18-rc3","v6.12.59","v6.6.117","v6.18-rc5","v6.18-rc6","v6.18-rc2","v6.12.58","v6.6.116","v6.18-rc4","v6.12.57","v6.12.56","v6.6.115","v6.12.55","v6.6.114","v6.1.157","v6.12.54","v6.6.113","v6.12.53","v6.6.112","v6.1.156","v6.12.52","v6.6.111","v6.1.155","v6.12.51","v6.6.110","v6.17","v6.17-rc7","v6.12.50","v6.6.109","v6.17-rc1","v6.17-rc2","v6.12.49","v6.6.108","v6.1.154","v6.17-rc6","v6.17-rc4","v6.17-rc5","v6.17-rc3","v6.16","v6.12.48","v6.6.107","v6.1.153","v6.12.47","v6.6.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