CVE-2026-46159

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The first pass counts entries to determine\nthe allocation size, then the second pass fills the buffer. The\ngroups_sem rwlock is released between passes, allowing concurrent block\ngroup removal to reduce the entry count.\n\nWhen the second pass fills fewer entries than the first pass counted,\ncopy_to_user() copies the full alloc_size bytes including trailing\nuninitialized kmalloc bytes to userspace.\n\nFix by copying only total_spaces entries (the actually-filled count from\nthe second pass) instead of alloc_size bytes, and switch to kzalloc so\nany future copy size mismatch cannot leak heap data."}], "id": "CVE-2026-46159", "lastModified": "2026-11-06T17:17:41.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46159", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:10:24.100456Z", "version": "2.0.3"}}]}, "published": "2026-05-28T10:16:31.553", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4fdc6ee0802121d9cd96b8d085e589f51e5a4ec3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5d12e0ab009ade48c1bff9324fd9bea2c773d088"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/973e57c726c1f8e77259d1c8e519519f1e9aea77"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d09d67d5de577cedae3de9497dff217e0ac8b641"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d69a4a6813fdba7c4cc3695a7e843842b240790d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d8224b1be6627c6c3b204bfb264508d27c65ac44"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f407aad350bdea4db300c47433573b7a41630d33"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f5ee467b56764964027c361641f64953fc0f8f9a"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-367"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: btrfs: fix btrfs_ioctl_space_info() slot_count TOCTOU which can lead to info-leak", "id": "2482527", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482527"}, "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-367", "details": ["A flaw was found in the btrfs filesystem within the Linux kernel. A Time-of-check to time-of-use (TOCTOU) race condition in the `btrfs_ioctl_space_info()` function allows a local attacker to exploit a timing window. This occurs when the system counts entries for allocation size and then fills a buffer, but a concurrent operation reduces the entry count between these two steps. Consequently, uninitialized kernel memory may be copied to userspace, leading to information disclosure."], "name": "CVE-2026-46159", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "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-2026-46159\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46159\nhttps://lore.kernel.org/linux-cve-announce/2026052824-CVE-2026-46159-2689@gregkh/T"], "threat_severity": "Moderate"}

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