{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1e7ab6f67824343ee3e96f100f0937c393749a8a"
            },
            {
              "fixed": "b9d45d328fcda4f0d3d281b7d6f12d3f181d9381"
            },
            {
              "fixed": "8e931557b317f0fb414839fa51fae1d5feb0ad97"
            },
            {
              "fixed": "6de2aeffabaafaeda819e60ec8d04f199711e11a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "9b8076a9404568d6cb6673b9a079558b15051966"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.15.6"
            },
            {
              "fixed": "6.16"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.16.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64596.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibfs: set SB_I_NOEXEC and SB_I_NODEV by default in init_pseudo()\n\nSince commit 1e7ab6f67824 (\"anon_inode: rework assertions\"),\npath_noexec() warns when an anonymous-inode file is mmap'd from a\nsuperblock that has not set SB_I_NOEXEC. dma-buf backs its files this\nway and never set the flag, so mmap of any exported buffer trips the\nwarning on a CONFIG_DEBUG_VFS=y kernel:\n\n  WARNING: CPU: 11 PID: 121813 at fs/exec.c:118 path_noexec+0x47/0x50\n   do_mmap+0x2b5/0x680\n   vm_mmap_pgoff+0x129/0x210\n   ksys_mmap_pgoff+0x177/0x240\n   __x64_sys_mmap+0x33/0x70\n\ninit_pseudo() sets up internal SB_NOUSER mounts that are never\npath-reachable. Set both flags here so every pseudo filesystem gets\nthem by default instead of each caller setting them.\n\nSB_I_NODEV is inert for unreachable mounts. SB_I_NOEXEC has one\nvisible effect: an executable mapping of a pseudo-fs fd, such as a\ndma-buf, now fails with -EPERM, which is the invariant the assertion\nenforces. No in-tree caller maps these executable.\n\nReproduce on CONFIG_DEBUG_VFS=y:\n\n  make -C tools/testing/selftests/dmabuf-heaps\n  sudo ./tools/testing/selftests/dmabuf-heaps/dmabuf-heap -t system",
  "id": "CVE-2026-64596",
  "modified": "2026-08-18T03:31:28.238696438Z",
  "published": "2026-08-06T07:13:51.523Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6de2aeffabaafaeda819e60ec8d04f199711e11a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e931557b317f0fb414839fa51fae1d5feb0ad97"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9d45d328fcda4f0d3d281b7d6f12d3f181d9381"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64596.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64596"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "libfs: set SB_I_NOEXEC and SB_I_NODEV by default in init_pseudo()"
}