CVE-2024-56626

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ksmbd is the in-kernel SMB server; smb2_write is reached by processing an SMB2 WRITE request received over TCP port 445 from a remote client.\nAC:L - The attacker simply sets req->Offset to a negative 64-bit value and supplies the write payload; the out-of-bounds write triggers reliably with no race or uncontrollable precondition.\nPR:L - The path requires a completed authenticated SMB session, a writable tree connect, and an open file handle with write access, so a valid (even low-privilege) SMB account is needed\u2014it is not a pre-auth handshake path.\nUI:N - Exploitation is fully driven by attacker-sent SMB2 packets and requires no action from any local user or victim.\nS:U - The out-of-bounds write corrupts kernel heap memory within the kernel's own security authority; no security boundary such as a VM or IOMMU is crossed.\nC:H - The attacker-controlled heap out-of-bounds write primitive can corrupt adjacent kernel structures and be leveraged into arbitrary memory disclosure.\nI:H - The client controls the negative offset, length, and content, producing a controlled out-of-bounds heap write suitable for arbitrary write and control-flow hijacking.\nA:H - Writing attacker-controlled data before a heap allocation reliably corrupts kernel memory, causing oops/panic and denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/smb2pdu.c"], "versions": [{"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "1aea5c9470be2c7129704fb1b9562b1e3e0576f8", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "8cd7490fc0f268883e86e840cda5311257af69ca", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "164d3597d26d9acff5d5b8bc3208bdcca942dd6a", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "c5797f195c67132d061d29c57a7c6d30530686f0", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "313dab082289e460391c82d855430ec8a28ddf81", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/smb2pdu.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.176", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.120", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.66", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.5", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13", "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": "5.15", "versionEndExcluding": "5.15.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.120"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.66"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1aea5c9470be2c7129704fb1b9562b1e3e0576f8"}, {"url": "https://git.kernel.org/stable/c/8cd7490fc0f268883e86e840cda5311257af69ca"}, {"url": "https://git.kernel.org/stable/c/164d3597d26d9acff5d5b8bc3208bdcca942dd6a"}, {"url": "https://git.kernel.org/stable/c/c5797f195c67132d061d29c57a7c6d30530686f0"}, {"url": "https://git.kernel.org/stable/c/313dab082289e460391c82d855430ec8a28ddf81"}], "title": "ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2024-56626", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-10-01T20:00:52.752066Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:07:12.560Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:51:15.360Z"}}]}}

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The client controls the negative offset, length, and content, producing a controlled out-of-bounds heap write suitable for arbitrary write and control-flow hijacking.\nA:H - Writing attacker-controlled data before a heap allocation reliably corrupts kernel memory, causing oops/panic and denial of service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "1aea5c9470be2c7129704fb1b9562b1e3e0576f8", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "8cd7490fc0f268883e86e840cda5311257af69ca", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "164d3597d26d9acff5d5b8bc3208bdcca942dd6a", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "c5797f195c67132d061d29c57a7c6d30530686f0", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "313dab082289e460391c82d855430ec8a28ddf81", "versionType": "git"}], "programFiles": ["fs/smb/server/smb2pdu.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"status": "unaffected", "version": "0", "lessThan": "5.15", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.176", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.120", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.66", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.5", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/server/smb2pdu.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/1aea5c9470be2c7129704fb1b9562b1e3e0576f8"}, {"url": "https://git.kernel.org/stable/c/8cd7490fc0f268883e86e840cda5311257af69ca"}, {"url": "https://git.kernel.org/stable/c/164d3597d26d9acff5d5b8bc3208bdcca942dd6a"}, {"url": "https://git.kernel.org/stable/c/c5797f195c67132d061d29c57a7c6d30530686f0"}, {"url": "https://git.kernel.org/stable/c/313dab082289e460391c82d855430ec8a28ddf81"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write\n\nAn offset from client could be a negative value, It could allows\nto write data outside the bounds of the allocated buffer.\nNote that this issue is coming when setting\n'vfs objects = streams_xattr parameter' in ksmbd.conf."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.176", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.120", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.66", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.5", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13", "versionStartIncluding": "5.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:45:31.355Z"}}}, "cveMetadata": {"cveId": "CVE-2024-56626", "state": "PUBLISHED", "dateUpdated": "2026-08-05T11:45:31.355Z", "dateReserved": "2024-12-27T14:03:06.017Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-12-27T14:51:29.078Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Un desplazamiento del cliente podr\u00eda ser un valor negativo, lo que podr\u00eda permitir escribir datos fuera de los l\u00edmites del b\u00fafer asignado. Tenga en cuenta que este problema se produce al configurar 'vfs objects = streams_xattr parameter' en ksmbd.conf."}], "id": "CVE-2024-56626", "lastModified": "2026-08-04T11:22:14.713", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "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": "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-56626", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T20:00:52.752066Z", "version": "2.0.3"}}]}, "published": "2024-12-27T15:15:22.140", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/164d3597d26d9acff5d5b8bc3208bdcca942dd6a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1aea5c9470be2c7129704fb1b9562b1e3e0576f8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/313dab082289e460391c82d855430ec8a28ddf81"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8cd7490fc0f268883e86e840cda5311257af69ca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c5797f195c67132d061d29c57a7c6d30530686f0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write", "id": "2334502", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334502"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write\nAn offset from client could be a negative value, It could allows\nto write data outside the bounds of the allocated buffer.\nNote that this issue is coming when setting\n'vfs objects = streams_xattr parameter' in ksmbd.conf."], "name": "CVE-2024-56626", "package_state": [{"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": "2024-12-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-56626\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-56626\nhttps://lore.kernel.org/linux-cve-announce/2024122712-CVE-2024-56626-f2f9@gregkh/T"], "threat_severity": "Important"}

{}