{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-31715",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-03-09T15:48:24.133Z",
        "datePublished": "2026-05-01T13:56:10.591Z",
        "dateUpdated": "2026-06-19T11:58:02.837Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-06-19T11:58:02.837Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_write_end_io()\n\nThe xfstests case \"generic/107\" and syzbot have both reported a NULL\npointer dereference.\n\nThe concurrent scenario that triggers the panic is as follows:\n\nF2FS_WB_CP_DATA write callback          umount\n                                        - f2fs_write_checkpoint\n                                         - f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA)\n- blk_mq_end_request\n - bio_endio\n  - f2fs_write_end_io\n   : dec_page_count(sbi, F2FS_WB_CP_DATA)\n   : wake_up(&sbi->cp_wait)\n                                        - kill_f2fs_super\n                                         - kill_block_super\n                                          - f2fs_put_super\n                                           : iput(sbi->node_inode)\n                                           : sbi->node_inode = NULL\n   : f2fs_in_warm_node_list\n    - is_node_folio // sbi->node_inode is NULL and panic\n\nThe root cause is that f2fs_put_super() calls iput(sbi->node_inode) and\nsets sbi->node_inode to NULL after sbi->nr_pages[F2FS_WB_CP_DATA] is\ndecremented to zero. As a result, f2fs_in_warm_node_list() may\ndereference a NULL node_inode when checking whether a folio belongs to\nthe node inode, leading to a panic.\n\nThis patch fixes the issue by calling f2fs_in_warm_node_list() before\ndecrementing sbi->nr_pages[F2FS_WB_CP_DATA], thus preventing the\nuse-after-free condition."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/f2fs/data.c"
                    ],
                    "versions": [
                        {
                            "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
                            "lessThan": "7dbdab4430e4654db9aacef12b9b3b8b29ca25cb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
                            "lessThan": "ffb94770dbdfb5411be5d9f44a960b010ec890ad",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
                            "lessThan": "0d40b26377f891e6dcb6efaf8ef9374c99be1b1d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
                            "lessThan": "1171f329cf1c175321251ac40fd126150d7ad1e8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
                            "lessThan": "7be222de96c0f9eee6e65eeb017ef855ee185cfa",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
                            "lessThan": "963d2e24d9d92a31e6773b0f642214f10013ebf7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
                            "lessThan": "188bb65f247a7a7c62f287c9a263aee3cad96fa5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e",
                            "lessThan": "2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/f2fs/data.c"
                    ],
                    "versions": [
                        {
                            "version": "4.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.259",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.210",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.176",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.140",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.86",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.25",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.2",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "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": "4.19",
                                    "versionEndExcluding": "5.10.259"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.19",
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                                {
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                                    "versionStartIncluding": "4.19",
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.19",
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/7dbdab4430e4654db9aacef12b9b3b8b29ca25cb"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ffb94770dbdfb5411be5d9f44a960b010ec890ad"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0d40b26377f891e6dcb6efaf8ef9374c99be1b1d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1171f329cf1c175321251ac40fd126150d7ad1e8"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7be222de96c0f9eee6e65eeb017ef855ee185cfa"
                },
                {
                    "url": "https://git.kernel.org/stable/c/963d2e24d9d92a31e6773b0f642214f10013ebf7"
                },
                {
                    "url": "https://git.kernel.org/stable/c/188bb65f247a7a7c62f287c9a263aee3cad96fa5"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53"
                }
            ],
            "title": "f2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_write_end_io()",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
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