CVE-2026-31715

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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"}, 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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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nf2fs: corrige UAF causada por la disminuci\u00f3n de sbi -> nr_pages[] en f2fs_write_end_io()\n\nEl caso de xfstests \u2019generic/107\u2019 y syzbot han reportado ambos una desreferencia de puntero NULL.\n\nEl escenario concurrente que desencadena el p\u00e1nico es el siguiente:\n\nF2FS_WB_CP_DATA write callback desmontar\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 es NULL y p\u00e1nico\n\nLa causa ra\u00edz es que f2fs_put_super() llama a iput(sbi -> node_inode) y establece sbi -> node_inode en NULL despu\u00e9s de que sbi -> nr_pages[F2FS_WB_CP_DATA] se decrementa a cero. Como resultado, f2fs_in_warm_node_list() puede desreferenciar un node_inode NULL al verificar si un folio pertenece al nodo inode, lo que lleva a un p\u00e1nico.\n\nEste parche corrige el problema llamando a f2fs_in_warm_node_list() antes de decrementar sbi -> nr_pages[F2FS_WB_CP_DATA], evitando as\u00ed la condici\u00f3n de uso despu\u00e9s de liberaci\u00f3n."}], "id": "CVE-2026-31715", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-01T14:16:21.637", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0d40b26377f891e6dcb6efaf8ef9374c99be1b1d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1171f329cf1c175321251ac40fd126150d7ad1e8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/188bb65f247a7a7c62f287c9a263aee3cad96fa5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7be222de96c0f9eee6e65eeb017ef855ee185cfa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7dbdab4430e4654db9aacef12b9b3b8b29ca25cb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/963d2e24d9d92a31e6773b0f642214f10013ebf7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ffb94770dbdfb5411be5d9f44a960b010ec890ad"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: f2fs: fix UAF caused by decrementing sbi->nr_pages[] in f2fs_write_end_io()", "id": "2464359", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464359"}, "csaw": false, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's Flash-Friendly File System (f2fs). A use-after-free vulnerability exists due to incorrect handling of page counts during concurrent write operations and unmounting. This can lead to a NULL pointer dereference, causing the system to panic and resulting in a Denial of Service (DoS)."], "name": "CVE-2026-31715", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31715\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31715\nhttps://lore.kernel.org/linux-cve-announce/2026050123-CVE-2026-31715-891c@gregkh/T"]}

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