{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.2.6-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  fs/ntfs3: preserve non-DOS attribute bits in system.dos_attrib  [BUG] A corrupted ntfs3 image can hit a NULL function pointer call in generic_perform_write() after toggling system.ntfs_attrib and then overwriting system.dos_attrib on the same file.  BUG: kernel NULL pointer dereference, address: 0000000000000000 \\#PF: supervisor instruction fetch in kernel mode \\#PF: error_code(0x0010) - not-present page PGD bed5067 P4D bed5067 PUD 0 Oops: Oops: 0010 [#1] SMP KASAN NOPTI RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0018:ffff88801025f988 EFLAGS: 00010246 Call Trace:  generic_perform_write+0x409/0x8c0 mm/filemap.c:4255  __generic_file_write_iter+0x1bb/0x200 mm/filemap.c:4372  ntfs_file_write_iter+0xcd9/0x1c20 fs/ntfs3/file.c:1253  new_sync_write fs/read_write.c:593 [inline]  vfs_write+0x63b/0xf70 fs/read_write.c:686  ksys_write+0x133/0x250 fs/read_write.c:738  __do_sys_write fs/read_write.c:749 [inline]  __se_sys_write fs/read_write.c:746 [inline]  __x64_sys_write+0x77/0xc0 fs/read_write.c:746  ...  [CAUSE] system.ntfs_attrib updates ATTR_DATA flags via ni_new_attr_flags() and switches i_mapping-\u003ea_ops to ntfs_aops_cmpr when FILE_ATTRIBUTE_COMPRESSED is set. system.dos_attrib then overwrites ni-\u003estd_fa from a one-byte DOS attribute value, clearing the compression bit without updating ATTR_DATA or the mapping operations.  Old buffered writes use is_compressed(ni) to choose __generic_file_write_iter(). That leaves generic_perform_write() calling a NULL write_begin callback from ntfs_aops_cmpr.  [FIX] Treat system.dos_attrib as a low-byte DOS attribute update and preserve the existing non-DOS attribute bits in ni-\u003estd_fa. This keeps compressed and sparse state consistent with ATTR_DATA and the mapping operations while keeping the existing DOS attribute semantics intact.",
  "id": "DEBIAN-CVE-2026-97439",
  "modified": "2026-09-26T08:47:39.983974019Z",
  "published": "2026-09-24T17:17:22.073Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-97439"
    }
  ],
  "upstream": [
    "CVE-2026-97439"
  ]
}