CVE-2026-43178

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Fix\nby jumping further to clean up only vm_file and name_buf."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path is reached through a local `ioctl(PROCMAP_QUERY)` on `/proc/<pid>/maps`; there is no network, adjacent, or physical attack path.\nAC:L - The trigger is deterministic: choose a file-backed VMA with a build ID and pass a nonzero build ID buffer smaller than the parsed build ID. No attacker-uncontrolled race or rare state is required.\nPR:L - An unprivileged local user can open and query `/proc/self/maps`; ptrace-style checks only restrict querying other processes. No real root or namespace-derived administrative capability is needed for self-triggering.\nUI:N - The attacker can perform the mapping and ioctl directly in their own process. No victim user action is required.\nS:U - The vulnerability corrupts kernel memory-management state within the same OS security authority. It is not a VM escape, IOMMU bypass, or cross-authority boundary violation.\nC:H - The double `mmput()` can prematurely run `__mmput()`/`exit_mmap()` and later free an mm still in use, creating use-after-free/refcount corruption of memory-management structures. Under the higher-severity rule, this is treated as capable of enabling high-impact information disclosure.\nI:H - Premature teardown/freeing of a live mm and page-table related state is memory-management corruption with plausible use-after-free exploitation potential. Under the higher-severity rule, this supports high integrity impact.\nA:H - Syzbot observed a kernel `__mmdrop()` warning with `mm == current->mm`, and the bug can tear down or free a live address space. 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provides incorrectly sized buffer for build ID for PROCMAP_QUERY\nwe return with -ENAMETOOLONG error. After recent changes this condition\nhappens later, after we unlocked mmap_lock/per-VMA lock and did mmput(),\nso original goto out is now wrong and will double-mmput() mm_struct. Fix\nby jumping further to clean up only vm_file and name_buf."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nprocfs: soluciona una posible doble llamada a mmput() en do_procmap_query()\n\nCuando el usuario proporciona un b\u00fafer de tama\u00f1o incorrecto para el ID de compilaci\u00f3n para PROCMAP_QUERY, devolvemos un error -ENAMETOOLONG. Despu\u00e9s de cambios recientes, esta condici\u00f3n ocurre m\u00e1s tarde, despu\u00e9s de que desbloqueamos mmap_lock/per-VMA lock e hicimos mmput(), por lo que el goto out original ahora es incorrecto y realizar\u00e1 una doble llamada a mmput() en mm_struct. Se soluciona saltando m\u00e1s all\u00e1 para limpiar solo vm_file y name_buf."}], "id": "CVE-2026-43178", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}, "published": "2026-05-06T12:16:36.303", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/61dc9f776705d6db6847c101b98fa4f0e9eb6fa3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8adaff87db143583e08eec4f4e7788f1ef8af94d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/90f5e87c9b75833b9ef3a4415b92c0247f28ab2f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f9fe092084cd04deea18747f58a2304026e76aaa"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-43178"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467227"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43178.json"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-1341"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: procfs: fix possible double mmput() in do_procmap_query()", "id": "2467227", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467227"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-1341", "details": ["A flaw was found in the Linux kernel's procfs component. A local user, by providing a malformed input buffer during a specific memory mapping query (PROCMAP_QUERY), can trigger an error in how the kernel manages process memory. This can lead to a double release of memory resources, potentially causing the system to crash and resulting in a denial of service (DoS)."], "name": "CVE-2026-43178", "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": "Under investigation", "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"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "moderate", "package_name": "rust", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43178\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43178\nhttps://lore.kernel.org/linux-cve-announce/2026050638-CVE-2026-43178-3c95@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b9b97e6aeb534315f9646b2090d1a5024c6a4e82,f9fe092084cd04deea18747f58a2304026e76aaa)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cbc03ce3e6ce7e21214c3f02218213574c1a2d08,8adaff87db143583e08eec4f4e7788f1ef8af94d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b5cbacd7f86f4f62b8813688c8e73be94e8e1951,90f5e87c9b75833b9ef3a4415b92c0247f28ab2f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b5cbacd7f86f4f62b8813688c8e73be94e8e1951,61dc9f776705d6db6847c101b98fa4f0e9eb6fa3)"}}], "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": "6.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.75,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.16,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.6,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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": "2026-05-06T16:45:07.232787+00:00", "updated": "2026-05-12T23:00:12.470047+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}