{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-53284",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-06-09T07:44:35.396Z",
        "datePublished": "2026-06-26T19:40:45.444Z",
        "dateUpdated": "2026-08-05T12:34:55.920Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:34:55.920Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: only release the dirty pages io tree after successful writes\n\n[WARNING]\nWith extra warning on dirty extent buffers at umount (aka, the next\npatch in the series), test case generic/388 can trigger the following\nwarning about dirty extent buffers at unmount time:\n\n  BTRFS critical (device dm-2 state E): emergency shutdown\n  BTRFS error (device dm-2 state E): error while writing out transaction: -30\n  BTRFS warning (device dm-2 state E): Skipping commit of aborted transaction.\n  BTRFS error (device dm-2 state EA): Transaction 9 aborted (error -30)\n  BTRFS: error (device dm-2 state EA) in cleanup_transaction:2068: errno=-30 Readonly filesystem\n  BTRFS info (device dm-2 state EA): forced readonly\n  BTRFS info (device dm-2 state EA): last unmount of filesystem 4fbf2e15-f941-49a0-bc7c-716315d2777c\n  ------------[ cut here ]------------\n  WARNING: disk-io.c:3311 at invalidate_and_check_btree_folios+0xfd/0x1ca [btrfs], CPU#8: umount/914368\n  CPU: 8 UID: 0 PID: 914368 Comm: umount Tainted: G           OE       7.1.0-rc1-custom+ #372 PREEMPT(full)  2de38db8d1deae71fde295430a0ff3ab98ccf596\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022\n  RIP: 0010:invalidate_and_check_btree_folios+0xfd/0x1ca [btrfs]\n  Call Trace:\n   <TASK>\n   close_ctree+0x52e/0x574 [btrfs d2f0b1cd330d1287e7a9919d112eadfc0e914efd]\n   generic_shutdown_super+0x89/0x1a0\n   kill_anon_super+0x16/0x40\n   btrfs_kill_super+0x16/0x20 [btrfs d2f0b1cd330d1287e7a9919d112eadfc0e914efd]\n   deactivate_locked_super+0x2d/0xb0\n   cleanup_mnt+0xdc/0x140\n   task_work_run+0x5a/0xa0\n   exit_to_user_mode_loop+0x123/0x4b0\n   do_syscall_64+0x243/0x7c0\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n   </TASK>\n  ---[ end trace 0000000000000000 ]---\n  BTRFS warning (device dm-2 state EA): unable to release extent buffer 30539776 owner 9 gen 9 refs 2 flags 0x7\n  BTRFS warning (device dm-2 state EA): unable to release extent buffer 30621696 owner 257 gen 9 refs 2 flags 0x7\n  BTRFS warning (device dm-2 state EA): unable to release extent buffer 30638080 owner 258 gen 9 refs 2 flags 0x7\n  BTRFS warning (device dm-2 state EA): unable to release extent buffer 30654464 owner 7 gen 9 refs 2 flags 0x7\n  BTRFS warning (device dm-2 state EA): unable to release extent buffer 30703616 owner 2 gen 9 refs 2 flags 0x7\n  BTRFS warning (device dm-2 state EA): unable to release extent buffer 30720000 owner 10 gen 9 refs 2 flags 0x7\n  BTRFS warning (device dm-2 state EA): unable to release extent buffer 30736384 owner 4 gen 9 refs 2 flags 0x7\n  BTRFS warning (device dm-2 state EA): unable to release extent buffer 30752768 owner 11 gen 9 refs 2 flags 0x7\n\nI'm using a stripped down version, which seems to trigger the warning\nmore reliably:\n\n  _fsstress_pid=\"\"\n  workload()\n  {\n  \tdmesg -C\n  \tmkfs.btrfs -f -K $dev > /dev/null\n  \techo 1 > /sys/kernel/debug/clear_warn_once\n  \tmount $dev $mnt\n  \t$fsstress -w -n 1024 -p 4 -d $mnt &\n  \t_fsstress_pid=$!\n  \tsleep 0\n  \t$godown $mnt\n  \tpkill --echo -PIPE fsstress > /dev/null\n  \twait $_fsstress_pid\n  \tunset _fsstress_pid\n  \tumount $mnt\n\n  \tif dmesg | grep -q \"WARNING\"; then\n  \t\tfail\n  \tfi\n  }\n\n  for (( i = 0; i < $runtime; i++ )); do\n  \techo \"=== $i/$runtime ===\"\n  \tworkload\n  done\n\n[CAUSE]\nInside btrfs_write_and_wait_transaction(), we first try to write all\ndirty ebs, then wait for them to finish.\n\nAfter that we call btrfs_extent_io_tree_release() to free all\nextent states from dirty_pages io tree.\n\nHowever if we hit an error from btrfs_write_marked_extent(), then we\nstill call btrfs_extent_io_tree_release() to clear that dirty_pages io\ntree, which may contain dirty records that we haven't yet submitted.\n\nFurthermore, the later transaction cleanup path will utilize that\ndirty_pages io tree to properly cleanup those dirty ebs, but since it's\nalready empty, no dirty ebs are properly cleaned up, thus will later\ntrigger the warnings inside invalidate_btree_folios().\n---truncated---"
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:N - A writable Btrfs filesystem can be driven remotely when exported through kernel network file services such as nfsd or ksmbd, whose COMMIT/FLUSH/write-sync paths call VFS fsync and reach Btrfs transaction commit. This is a reasonable high-impact deployment for Btrfs-backed NAS or server shares.\nAC:L - The attacker can create dirty Btrfs metadata and force commits/syncs through normal file operations; in the highest reasonable scenario, storage/writeback failure can be induced by exhausting thin or shared backing storage. No race or precise memory layout is required.\nPR:N - There is no Btrfs capability check on the vulnerable transaction writeback path, and a remotely writable NFS/SMB export can expose it without local kernel privileges. Choosing the higher-severity case, an accessible writable export/guest-style share requires no privileges on the target host.\nUI:N - Exploitation is driven by attacker-controlled file operations and sync/flush requests. No victim user action is required beyond the system already serving or mounting the Btrfs filesystem.\nS:U - The impact remains within the kernel/filesystem security authority. It does not cross a VM, IOMMU, or sandbox boundary.\nC:N - The bug prematurely drops dirty extent tracking and prevents proper cleanup; it is not a use-after-free, out-of-bounds read, or information disclosure primitive. The investigated impact does not expose kernel or filesystem data to the attacker.\nI:N - The defect does not provide an arbitrary write or controlled data modification primitive. Any failed or late metadata write is part of transaction abort/cleanup behavior rather than attacker-controlled integrity compromise.\nA:H - Leftover dirty extent buffers can later be written back during teardown after workers are stopped, leading to NULL pointer dereferences or kernel warnings/panic conditions. This can crash the kernel or make the filesystem unavailable."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/btrfs/disk-io.c",
                        "fs/btrfs/transaction.c"
                    ],
                    "versions": [
                        {
                            "version": "663dfbb07774e0fe1049e8db3054a08500122f18",
                            "lessThan": "9ebb7eba1237dc198768b9c76506a79f924c82bb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "663dfbb07774e0fe1049e8db3054a08500122f18",
                            "lessThan": "df03d67dc63722845cb9fe59d815d1225b04fd54",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "663dfbb07774e0fe1049e8db3054a08500122f18",
                            "lessThan": "4066c55e109475a06d18a1f127c939d551211956",
                            "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/btrfs/disk-io.c",
                        "fs/btrfs/transaction.c"
                    ],
                    "versions": [
                        {
                            "version": "3.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.33",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.10",
                            "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": "3.19",
                                    "versionEndExcluding": "6.18.33"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.19",
                                    "versionEndExcluding": "7.0.10"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.19",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/9ebb7eba1237dc198768b9c76506a79f924c82bb"
                },
                {
                    "url": "https://git.kernel.org/stable/c/df03d67dc63722845cb9fe59d815d1225b04fd54"
                },
                {
                    "url": "https://git.kernel.org/stable/c/4066c55e109475a06d18a1f127c939d551211956"
                }
            ],
            "title": "btrfs: only release the dirty pages io tree after successful writes",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}