{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64596",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T15:36:31.799Z",
        "datePublished": "2026-08-06T07:13:51.523Z",
        "dateUpdated": "2026-08-17T04:58:18.647Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T04:58:18.647Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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"
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/libfs.c"
                    ],
                    "versions": [
                        {
                            "version": "1e7ab6f67824343ee3e96f100f0937c393749a8a",
                            "lessThan": "b9d45d328fcda4f0d3d281b7d6f12d3f181d9381",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1e7ab6f67824343ee3e96f100f0937c393749a8a",
                            "lessThan": "8e931557b317f0fb414839fa51fae1d5feb0ad97",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1e7ab6f67824343ee3e96f100f0937c393749a8a",
                            "lessThan": "6de2aeffabaafaeda819e60ec8d04f199711e11a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9b8076a9404568d6cb6673b9a079558b15051966",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.15.6",
                            "lessThan": "6.16",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/libfs.c"
                    ],
                    "versions": [
                        {
                            "version": "6.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.39",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.4",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "6.18.39"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "7.1.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "7.2"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.15.6"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/b9d45d328fcda4f0d3d281b7d6f12d3f181d9381"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8e931557b317f0fb414839fa51fae1d5feb0ad97"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6de2aeffabaafaeda819e60ec8d04f199711e11a"
                }
            ],
            "title": "libfs: set SB_I_NOEXEC and SB_I_NODEV by default in init_pseudo()",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}