CVE-2026-31715

{"id": "CVE-2026-31715", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e", "lessThan": "7dbdab4430e4654db9aacef12b9b3b8b29ca25cb", "versionType": "git"}, {"status": "affected", "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e", "lessThan": "ffb94770dbdfb5411be5d9f44a960b010ec890ad", "versionType": "git"}, {"status": "affected", "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e", "lessThan": "0d40b26377f891e6dcb6efaf8ef9374c99be1b1d", "versionType": "git"}, {"status": "affected", "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e", "lessThan": "1171f329cf1c175321251ac40fd126150d7ad1e8", "versionType": "git"}, {"status": "affected", "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e", "lessThan": "7be222de96c0f9eee6e65eeb017ef855ee185cfa", "versionType": "git"}, {"status": "affected", "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e", "lessThan": "963d2e24d9d92a31e6773b0f642214f10013ebf7", "versionType": "git"}, {"status": "affected", "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e", "lessThan": "188bb65f247a7a7c62f287c9a263aee3cad96fa5", "versionType": "git"}, {"status": "affected", "version": "50fa53eccf9f911a5b435248a2b0bd484fd82e5e", "lessThan": "2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53", "versionType": "git"}], "programFiles": ["fs/f2fs/data.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.19"}, {"status": "unaffected", "version": "0", "lessThan": "4.19", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.259", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.140", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.86", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.25", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.2", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/f2fs/data.c"], "defaultStatus": "affected"}]}], "published": "2026-05-01T14:16:21.637", "references": [{"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"}, {"url": "https://git.kernel.org/stable/c/188bb65f247a7a7c62f287c9a263aee3cad96fa5", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53", "tags": ["Patch"], "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"}, {"url": "https://git.kernel.org/stable/c/963d2e24d9d92a31e6773b0f642214f10013ebf7", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ffb94770dbdfb5411be5d9f44a960b010ec890ad", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}], "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."}, {"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."}], "lastModified": "2026-11-11T21:10:00.200", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8FCBD357-E27C-4208-8F7A-93061EE45D3E", "versionEndExcluding": "6.18.25", "versionStartIncluding": "4.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1BD58F1E-7C20-4C0D-92A2-FAC5CBFBE8A8", "versionEndExcluding": "7.0.2", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}