{"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": "2026-05-01T13:56:10.591Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-01T13:56:10.591Z"}, "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": "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": "6.18.25", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.2", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1-rc1", "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": "6.18.25"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.0.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.1-rc1"}]}]}], "references": [{"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"}}}}

{}

{"cveTags": [], "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."}], "id": "CVE-2026-31715", "lastModified": "2026-05-01T15:24:14.893", "metrics": {}, "published": "2026-05-01T14:16:21.637", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/188bb65f247a7a7c62f287c9a263aee3cad96fa5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2d9c4a4ed4eef1f82c5b16b037aee8bad819fd53"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/963d2e24d9d92a31e6773b0f642214f10013ebf7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{}

{}