CVE-2026-46164

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The vulnerable code is only reachable through `open_ctree()` during a btrfs mount; it is not exposed over any network protocol and requires local access to introduce and mount the filesystem.\nAC:H - The double-free only triggers when `kobject_init_and_add()` fails (effectively ENOMEM, which the attacker cannot reliably induce at that exact allocation), and additionally requires a rare zoned btrfs configuration \u2014 conditions beyond the attacker's control.\nPR:N - Following the kernel CNA crafted-image mount-bug model, the attacker needs no privileges to supply the malicious zoned btrfs image; the privileged mount operation is captured under User Interaction.\nUI:R - A victim must perform the mount of the attacker-supplied zoned btrfs filesystem for the vulnerable path to execute.\nS:U - The corruption stays within the kernel's own memory/security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - A double-free corrupts the SLUB freelist and can be leveraged into a use-after-free granting attacker-controlled reads of freed/adjacent slab objects, enabling kernel memory disclosure.\nI:H - Freelist corruption from the double-free can be groomed into an arbitrary-write primitive, allowing modification of kernel data structures and control-flow hijacking.\nA:H - The double-free reliably corrupts slab state and (with freelist hardening) trips a BUG/panic, crashing the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/space-info.c"], "versions": [{"version": "64c7ddda83acfbaa0efb381a1928ce908c584607", "lessThan": "c2d59527cba6d59f0d77a75c1101ab4e69758bea", "status": "affected", "versionType": "git"}, {"version": "0bd151ce4200ca847990e05cca29a76456982ca5", "lessThan": "d2a675f2e238ec96c8e91e2718c1f910c9c8fb21", "status": "affected", "versionType": "git"}, {"version": "190d5a7c4fe42b8c9aa46e3336389e7cb10395bb", "lessThan": "14b22be1dd844383eb03af9b1ee3b6b25d32aeaf", "status": "affected", "versionType": "git"}, {"version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9", "lessThan": "dfd05a16b5c9d1d98b47905f37f2fccda52173d1", "status": "affected", "versionType": "git"}, {"version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9", "lessThan": "259af6857a1b4f1e9ef8b780353f9d11c26a22bd", "status": "affected", "versionType": "git"}, {"version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9", "lessThan": "a7449edf96143f192606ec8647e3167e1ecbd728", "status": "affected", "versionType": "git"}, {"version": "6.1.162", "lessThan": "6.1.176", "status": "affected", "versionType": "semver"}, {"version": "6.6.122", "lessThan": "6.6.141", "status": "affected", "versionType": "semver"}, {"version": "6.12.67", "lessThan": "6.12.90", "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/space-info.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.90", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.32", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.7", "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": "6.1.162", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.122", "versionEndExcluding": "6.6.141"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.67", "versionEndExcluding": "6.12.90"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18.32"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c2d59527cba6d59f0d77a75c1101ab4e69758bea"}, {"url": "https://git.kernel.org/stable/c/d2a675f2e238ec96c8e91e2718c1f910c9c8fb21"}, {"url": "https://git.kernel.org/stable/c/14b22be1dd844383eb03af9b1ee3b6b25d32aeaf"}, {"url": "https://git.kernel.org/stable/c/dfd05a16b5c9d1d98b47905f37f2fccda52173d1"}, {"url": "https://git.kernel.org/stable/c/259af6857a1b4f1e9ef8b780353f9d11c26a22bd"}, {"url": "https://git.kernel.org/stable/c/a7449edf96143f192606ec8647e3167e1ecbd728"}], "title": "btrfs: fix double free in create_space_info_sub_group() error path", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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"versionType": "git"}, {"lessThan": "a7449edf96143f192606ec8647e3167e1ecbd728", "status": "affected", "version": "f92ee31e031c7819126d2febdda0c3e91f5d2eb9", "versionType": "git"}, {"lessThan": "6.1.176", "status": "affected", "version": "6.1.162", "versionType": "semver"}, {"lessThan": "6.6.141", "status": "affected", "version": "6.6.122", "versionType": "semver"}, {"lessThan": "6.12.90", "status": "affected", "version": "6.12.67", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/btrfs/space-info.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"lessThan": "6.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.176", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.141", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.90", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.32", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CC09986F-7799-41B9-80E9-13187E3E33E7", "versionEndExcluding": "6.2", "versionStartIncluding": "6.1.162", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9DDACAED-DB5F-4215-90D1-9638039CD94F", "versionEndExcluding": "6.6.141", "versionStartIncluding": "6.6.122", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2B62EF25-7B21-4945-BFC3-D47BBC89F73F", "versionEndExcluding": "6.12.90", "versionStartIncluding": "6.12.67", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FF62AC18-3B67-498C-BE98-210B26013D50", "versionEndExcluding": "6.18.32", "versionStartIncluding": "6.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D0893CA7-9AE6-4DFE-AC75-48967D73AD8E", "versionEndExcluding": "7.0.7", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix double free in create_space_info_sub_group() error path\n\nWhen kobject_init_and_add() fails, the call chain is:\n\ncreate_space_info_sub_group()\n-> btrfs_sysfs_add_space_info_type()\n-> kobject_init_and_add()\n-> failure\n-> kobject_put(&sub_group->kobj)\n-> space_info_release()\n-> kfree(sub_group)\n\nThen control returns to create_space_info_sub_group(), where:\n\nbtrfs_sysfs_add_space_info_type() returns error\n-> kfree(sub_group)\n\nThus, sub_group is freed twice.\n\nKeep parent->sub_group[index] = NULL for the failure path, but after\nbtrfs_sysfs_add_space_info_type() has called kobject_put(), let the\nkobject release callback handle the cleanup."}], "id": "CVE-2026-46164", "lastModified": "2026-06-19T13:16:34.477", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-28T10:16:32.043", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/14b22be1dd844383eb03af9b1ee3b6b25d32aeaf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/259af6857a1b4f1e9ef8b780353f9d11c26a22bd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a7449edf96143f192606ec8647e3167e1ecbd728"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c2d59527cba6d59f0d77a75c1101ab4e69758bea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d2a675f2e238ec96c8e91e2718c1f910c9c8fb21"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dfd05a16b5c9d1d98b47905f37f2fccda52173d1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: btrfs: fix double free in create_space_info_sub_group() error path", "id": "2482642", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482642"}, "csaw": false, "cwe": "CWE-1341", "details": ["A flaw was found in the Linux kernel's btrfs filesystem. This vulnerability, a double free, occurs in the `create_space_info_sub_group()` function's error handling path. When `kobject_init_and_add()` fails, a memory region can be freed twice. This can lead to memory corruption, potentially resulting in a denial of service or other unpredictable system behavior."], "name": "CVE-2026-46164", "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": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46164\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46164\nhttps://lore.kernel.org/linux-cve-announce/2026052825-CVE-2026-46164-6259@gregkh/T"]}

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