CVE-2026-74571

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74571", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.917Z", "datePublished": "2026-08-15T12:28:10.711Z", "dateUpdated": "2026-10-30T12:30:11.015Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:30:11.015Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: skip global block reserve accounting for rescue mounts\n\n[BUG]\nMounting with rescue=ibadroots after corrupting the block group tree\nroot triggers a NULL pointer dereference:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000100\n RIP: 0010:btrfs_update_global_block_rsv+0x9d/0x1c0 [btrfs]\n Call Trace:\n fill_dummy_bgs+0xd4/0x120 [btrfs]\n open_ctree+0xc6e/0x1ca0 [btrfs]\n btrfs_get_tree+0x50d/0xa40 [btrfs]\n\nThe same crash occurs with a corrupted raid stripe tree root, via\nbtrfs_read_block_groups() instead of fill_dummy_bgs().\n\n[CAUSE]\nWith rescue=ibadroots, btrfs_read_roots() allows the mount to continue\nwhen either root cannot be read, leaving the corresponding root pointer\nNULL while its on-disk feature bit remains set.\n\nbtrfs_update_global_block_rsv() then dereferences the missing root based\non the feature bit alone.\n\n[FIX]\nRescue mounts are fully read-only and cannot start transactions, so the\nglobal reserve is never consumed. Under btrfs_is_full_ro(), mark the\nreserve as full and return before performing the accounting.\n\nAnd since we need to check if the fs is mount fully RO, export\nfs_is_full_ro() as btrfs_is_full_ro(), and move it to fs.h.\n\n[ Squash the fs_is_full_ro() export commit into this one. ]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/block-rsv.c", "fs/btrfs/disk-io.c", "fs/btrfs/fs.h"], "versions": [{"version": "cbec34d3021d47007a0334c634f7053dbaf93d02", "lessThan": "aa72cc4675240ab6b01ec72ac6a1fe832e715569", "status": "affected", "versionType": "git"}, {"version": "8dbfc14fc736eb701089aff09645c3d4ad3decb1", "lessThan": "ca05d9abde2195cec3d07d0d4d65152d8171078f", "status": "affected", "versionType": "git"}, {"version": "8dbfc14fc736eb701089aff09645c3d4ad3decb1", "lessThan": "3a69fae2371a5ee190d4c4bbe5304a753558c1c6", "status": "affected", "versionType": "git"}, {"version": "8dbfc14fc736eb701089aff09645c3d4ad3decb1", "lessThan": "969a96479add6bd42d7f7241f99f27b31571a953", "status": "affected", "versionType": "git"}, {"version": "8dbfc14fc736eb701089aff09645c3d4ad3decb1", "lessThan": "076349e4c8d11f6b58c4549976a513b2b4dc6df2", "status": "affected", "versionType": "git"}, {"version": "8dbfc14fc736eb701089aff09645c3d4ad3decb1", "lessThan": "51a0e8399858621442807a26057bcd1cd3ced046", "status": "affected", "versionType": "git"}, {"version": "1e8087589b5cf6fa17adaf57b64cf1656d77dfec", "status": "affected", "versionType": "git"}, {"version": "6.1.43", "lessThan": "6.1.191", "status": "affected", "versionType": "semver"}, {"version": "6.4.8", "lessThan": "6.5", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/block-rsv.c", "fs/btrfs/disk-io.c", "fs/btrfs/fs.h"], "versions": [{"version": "6.5", "status": "affected"}, {"version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.1.43", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4.8"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/aa72cc4675240ab6b01ec72ac6a1fe832e715569"}, {"url": "https://git.kernel.org/stable/c/ca05d9abde2195cec3d07d0d4d65152d8171078f"}, {"url": "https://git.kernel.org/stable/c/3a69fae2371a5ee190d4c4bbe5304a753558c1c6"}, {"url": "https://git.kernel.org/stable/c/969a96479add6bd42d7f7241f99f27b31571a953"}, {"url": "https://git.kernel.org/stable/c/076349e4c8d11f6b58c4549976a513b2b4dc6df2"}, {"url": "https://git.kernel.org/stable/c/51a0e8399858621442807a26057bcd1cd3ced046"}], "title": "btrfs: skip global block reserve accounting for rescue mounts", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/btrfs/block-rsv.c", "fs/btrfs/disk-io.c", "fs/btrfs/fs.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "aa72cc4675240ab6b01ec72ac6a1fe832e715569", "status": "affected", "version": "cbec34d3021d47007a0334c634f7053dbaf93d02", "versionType": "git"}, {"lessThan": "ca05d9abde2195cec3d07d0d4d65152d8171078f", "status": "affected", "version": "8dbfc14fc736eb701089aff09645c3d4ad3decb1", "versionType": "git"}, {"lessThan": "3a69fae2371a5ee190d4c4bbe5304a753558c1c6", "status": "affected", "version": "8dbfc14fc736eb701089aff09645c3d4ad3decb1", "versionType": "git"}, {"lessThan": "969a96479add6bd42d7f7241f99f27b31571a953", "status": "affected", "version": "8dbfc14fc736eb701089aff09645c3d4ad3decb1", "versionType": "git"}, {"lessThan": "076349e4c8d11f6b58c4549976a513b2b4dc6df2", "status": "affected", "version": "8dbfc14fc736eb701089aff09645c3d4ad3decb1", "versionType": "git"}, {"lessThan": "51a0e8399858621442807a26057bcd1cd3ced046", "status": "affected", "version": "8dbfc14fc736eb701089aff09645c3d4ad3decb1", "versionType": "git"}, {"status": "affected", "version": "1e8087589b5cf6fa17adaf57b64cf1656d77dfec", "versionType": "git"}, {"lessThan": "6.1.191", "status": "affected", "version": "6.1.43", "versionType": "semver"}, {"lessThan": "6.5", "status": "affected", "version": "6.4.8", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/btrfs/block-rsv.c", "fs/btrfs/disk-io.c", "fs/btrfs/fs.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.5"}, {"lessThan": "6.5", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: skip global block reserve accounting for rescue mounts\n\n[BUG]\nMounting with rescue=ibadroots after corrupting the block group tree\nroot triggers a NULL pointer dereference:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000100\n RIP: 0010:btrfs_update_global_block_rsv+0x9d/0x1c0 [btrfs]\n Call Trace:\n fill_dummy_bgs+0xd4/0x120 [btrfs]\n open_ctree+0xc6e/0x1ca0 [btrfs]\n btrfs_get_tree+0x50d/0xa40 [btrfs]\n\nThe same crash occurs with a corrupted raid stripe tree root, via\nbtrfs_read_block_groups() instead of fill_dummy_bgs().\n\n[CAUSE]\nWith rescue=ibadroots, btrfs_read_roots() allows the mount to continue\nwhen either root cannot be read, leaving the corresponding root pointer\nNULL while its on-disk feature bit remains set.\n\nbtrfs_update_global_block_rsv() then dereferences the missing root based\non the feature bit alone.\n\n[FIX]\nRescue mounts are fully read-only and cannot start transactions, so the\nglobal reserve is never consumed. Under btrfs_is_full_ro(), mark the\nreserve as full and return before performing the accounting.\n\nAnd since we need to check if the fs is mount fully RO, export\nfs_is_full_ro() as btrfs_is_full_ro(), and move it to fs.h.\n\n[ Squash the fs_is_full_ro() export commit into this one. ]"}], "id": "CVE-2026-74571", "lastModified": "2026-10-30T13:20:02.770", "metrics": {}, "published": "2026-08-15T13:18:02.733", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/076349e4c8d11f6b58c4549976a513b2b4dc6df2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3a69fae2371a5ee190d4c4bbe5304a753558c1c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/51a0e8399858621442807a26057bcd1cd3ced046"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/969a96479add6bd42d7f7241f99f27b31571a953"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aa72cc4675240ab6b01ec72ac6a1fe832e715569"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ca05d9abde2195cec3d07d0d4d65152d8171078f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: btrfs: skip global block reserve accounting for rescue mounts", "id": "2517048", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517048"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbtrfs: skip global block reserve accounting for rescue mounts\n[BUG]\nMounting with rescue=ibadroots after corrupting the block group tree\nroot triggers a NULL pointer dereference:\nBUG: kernel NULL pointer dereference, address: 0000000000000100\nRIP: 0010:btrfs_update_global_block_rsv+0x9d/0x1c0 [btrfs]\nCall Trace:\nfill_dummy_bgs+0xd4/0x120 [btrfs]\nopen_ctree+0xc6e/0x1ca0 [btrfs]\nbtrfs_get_tree+0x50d/0xa40 [btrfs]\nThe same crash occurs with a corrupted raid stripe tree root, via\nbtrfs_read_block_groups() instead of fill_dummy_bgs().\n[CAUSE]\nWith rescue=ibadroots, btrfs_read_roots() allows the mount to continue\nwhen either root cannot be read, leaving the corresponding root pointer\nNULL while its on-disk feature bit remains set.\nbtrfs_update_global_block_rsv() then dereferences the missing root based\non the feature bit alone.\n[FIX]\nRescue mounts are fully read-only and cannot start transactions, so the\nglobal reserve is never consumed. Under btrfs_is_full_ro(), mark the\nreserve as full and return before performing the accounting.\nAnd since we need to check if the fs is mount fully RO, export\nfs_is_full_ro() as btrfs_is_full_ro(), and move it to fs.h.\n[ Squash the fs_is_full_ro() export commit into this one. ]", "A flaw was found in the Linux kernel's btrfs filesystem. When mounting a btrfs filesystem with the `rescue=ibadroots` option after corrupting the block group tree root or raid stripe tree root, the system attempts to update the global block reserve. This process dereferences a missing root pointer, leading to a NULL pointer dereference. This vulnerability can cause a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-74571", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74571\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74571\nhttps://lore.kernel.org/linux-cve-announce/2026081554-CVE-2026-74571-b7b1@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8dbfc14fc736eb701089aff09645c3d4ad3decb1,076349e4c8d11f6b58c4549976a513b2b4dc6df2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8dbfc14fc736eb701089aff09645c3d4ad3decb1,51a0e8399858621442807a26057bcd1cd3ced046)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "cbec34d3021d47007a0334c634f7053dbaf93d02"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "1e8087589b5cf6fa17adaf57b64cf1656d77dfec"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.43,6.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.4.8,6.5)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.5)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.8,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc6,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T15:45:06.743291+00:00", "updated": "2026-08-21T20:00:13.947083+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}