{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.176-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.85-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.19.14-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "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 \u003e\u003e 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 \u003e\u003e 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-\u003efirst  // 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.",
  "id": "DEBIAN-CVE-2026-43071",
  "modified": "2026-09-09T08:47:23.837872067Z",
  "published": "2026-05-05T16:16:16.420Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-43071"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-43071"
  ]
}