CVE-2022-49077

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Given the\nlow (so far) number of unique reports, the benefits of detecting more\nbuggy callers seem to outweigh the cost of having to fix cases such as\nthis one, where userspace is doing something silly. 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"vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D25878D3-7761-4E9F-8919-E92CD53896E0", "versionEndExcluding": "5.15.34", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "ABBBA66E-0244-4621-966B-9790AF1EEB00", "versionEndExcluding": "5.16.20", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "AE420AC7-1E59-4398-B84F-71F4B4337762", "versionEndExcluding": "5.17.3", "versionStartIncluding": "5.17", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.18:rc1:*:*:*:*:*:*", "matchCriteriaId": "6AD94161-84BB-42E6-9882-4FC0C42E9FC1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0)\n\nIf an mremap() syscall with old_size=0 ends up in move_page_tables(), it\nwill call invalidate_range_start()/invalidate_range_end() unnecessarily,\ni.e. with an empty range.\n\nThis causes a WARN in KVM's mmu_notifier. In the past, empty ranges\nhave been diagnosed to be off-by-one bugs, hence the WARNing. Given the\nlow (so far) number of unique reports, the benefits of detecting more\nbuggy callers seem to outweigh the cost of having to fix cases such as\nthis one, where userspace is doing something silly. In this particular\ncase, an early return from move_page_tables() is enough to fix the\nissue."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mmmremap.c: evitar invalidate_range_start/end in\u00fatil en mremap(old_size=0) Si una llamada al sistema mremap() con old_size=0 termina en move_page_tables(), llamar\u00e1 a invalidate_range_start()/invalidate_range_end() innecesariamente, es decir, con un rango vac\u00edo. Esto provoca una ADVERTENCIA en mmu_notifier de KVM. En el pasado, se ha diagnosticado que los rangos vac\u00edos eran errores con un desfase de uno, de ah\u00ed la ADVERTENCIA. Dado el bajo n\u00famero (hasta ahora) de informes \u00fanicos, los beneficios de detectar m\u00e1s llamadores con errores parecen superar el costo de tener que arreglar casos como este, donde el espacio de usuario est\u00e1 haciendo algo tonto. En este caso particular, un retorno temprano de move_page_tables() es suficiente para solucionar el problema."}], "id": "CVE-2022-49077", "lastModified": "2026-11-05T20:16:57.693", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-49077", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T19:42:49.710972Z", "version": "2.0.3"}}]}, "published": "2025-02-26T07:00:45.043", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/01e67e04c28170c47700c2c226d732bbfedb1ad0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/04bc13dae4a27b8d030843c85ae452bb2f1d9c1f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2358aa84ef6dafcf544a557caaa6b91afb4a0bd2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7d659cb1763ff17d1c6ee082fa6feb4267c7a30b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a05540f3903bd8295e8c4cd90dd3d416239a115b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e2c328c2a8f9de8b761bd4025b66c63120c55761"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eeaf28e2a0128147d687237e59d5407ee1b14693"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-193"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0)", "id": "2347642", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347642"}, "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-193", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0)\nIf an mremap() syscall with old_size=0 ends up in move_page_tables(), it\nwill call invalidate_range_start()/invalidate_range_end() unnecessarily,\ni.e. with an empty range.\nThis causes a WARN in KVM's mmu_notifier. In the past, empty ranges\nhave been diagnosed to be off-by-one bugs, hence the WARNing. Given the\nlow (so far) number of unique reports, the benefits of detecting more\nbuggy callers seem to outweigh the cost of having to fix cases such as\nthis one, where userspace is doing something silly. In this particular\ncase, an early return from move_page_tables() is enough to fix the\nissue."], "name": "CVE-2022-49077", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49077\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49077\nhttps://lore.kernel.org/linux-cve-announce/2025022656-CVE-2022-49077-6e0c@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:01:20.799119+00:00", "updated": "2025-07-12T22:01:20.799167+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}