CVE-2024-49996

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Fix this problem and correctly subtract\nvariable len.\n\nMember InodeType is present only when reparse buffer is large enough. Check\nfor ReparseDataLength before accessing InodeType to prevent another invalid\nmemory access.\n\nMajor and minor rdev values are present also only when reparse buffer is\nlarge enough. Check for reparse buffer size before calling reparse_mkdev()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H", "baseScore": 9.4, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The malformed reparse buffer arrives in an SMB2/SMB1 FSCTL_GET_REPARSE_POINT response over TCP/445 from the remote server, so a malicious or compromised SMB server \u2014 or an on-path attacker tampering with an unsigned session \u2014 reaches the parser purely over the network.\nAC:L - The server fully controls ReparseTag, ReparseDataLength and the payload, so the out-of-bounds read is triggered deterministically on every lookup/stat of the crafted reparse point, with no race or unpredictable state involved.\nPR:N - The attacker is the remote peer (server or MITM) and needs no account, credentials or privileges on the victim client; the client parses the reparse data as part of normal metadata handling on the established connection.\nUI:N - Against an already-mounted share (the normal enterprise/automount case) any routine path lookup \u2014 ls, a backup job, an indexer \u2014 hits the parser, so a compromised server or MITM needs no victim action.\nS:U - The out-of-bounds read and the resulting disclosure/crash stay within the kernel of the client host; no VM, IOMMU or other security-authority boundary is crossed.\nC:H - Adjacent kernel heap memory read past the reparse buffer is converted into the symlink target string and the inode's st_rdev, both readable by any local user via readlink()/stat(), and the attacker can repeat it arbitrarily to sweep recycled SMB response buffers and neighbouring slab objects.\nI:L - There is no out-of-bounds write, but client-side filesystem metadata \u2014 the symlink target and the device major/minor stored in the inode cache \u2014 is built from out-of-bounds kernel memory, giving limited corruption of state the client presents to userspace.\nA:H - When the crafted response ends at the allocation boundary the read leaves the slab object and can touch an unmapped page or trip KASAN/hardening checks, producing an oops or panic that the remote attacker can trigger repeatedly."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/reparse.c"], "versions": [{"version": "d5ecebc4900df7f6e8dff0717574668885110553", "lessThan": "7b222d6cb87077faf56a687a72af1951cf78c8a9", "status": "affected", "versionType": "git"}, {"version": "d5ecebc4900df7f6e8dff0717574668885110553", "lessThan": "73b078e3314d4854fd8286f3ba65c860ddd3a3dd", "status": "affected", "versionType": "git"}, {"version": "d5ecebc4900df7f6e8dff0717574668885110553", "lessThan": "01cdddde39b065074fd48f07027757783cbf5b7d", "status": "affected", "versionType": "git"}, {"version": "d5ecebc4900df7f6e8dff0717574668885110553", "lessThan": 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Fix this problem and correctly subtract\nvariable len.\n\nMember InodeType is present only when reparse buffer is large enough. Check\nfor ReparseDataLength before accessing InodeType to prevent another invalid\nmemory access.\n\nMajor and minor rdev values are present also only when reparse buffer is\nlarge enough. 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Fix this problem and correctly subtract\nvariable len.\n\nMember InodeType is present only when reparse buffer is large enough. Check\nfor ReparseDataLength before accessing InodeType to prevent another invalid\nmemory access.\n\nMajor and minor rdev values are present also only when reparse buffer is\nlarge enough. Check for reparse buffer size before calling reparse_mkdev()."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cifs: Se corrige el desbordamiento de b\u00fafer al analizar los puntos de an\u00e1lisis de NFS ReparseDataLength es la suma del tama\u00f1o de InodeType y el tama\u00f1o de DataBuffer. Por lo tanto, para obtener el tama\u00f1o de DataBuffer, es necesario restar el tama\u00f1o de InodeType de ReparseDataLength. La funci\u00f3n cifs_strndup_from_utf16() est\u00e1 accediendo actualmente a buf->DataBuffer en la posici\u00f3n despu\u00e9s del final del b\u00fafer porque no resta el tama\u00f1o de InodeType de la longitud. Solucione este problema y reste correctamente la variable len. El miembro InodeType solo est\u00e1 presente cuando el b\u00fafer de an\u00e1lisis es lo suficientemente grande. Verifique ReparseDataLength antes de acceder a InodeType para evitar otro acceso no v\u00e1lido a la memoria. Los valores rdev principales y secundarios tambi\u00e9n est\u00e1n presentes solo cuando el b\u00fafer de an\u00e1lisis es lo suficientemente grande. Verifique el tama\u00f1o del b\u00fafer de an\u00e1lisis antes de llamar a reparse_mkdev()."}], "id": "CVE-2024-49996", "lastModified": "2026-08-04T11:21:07.337", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.4, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.5, "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-49996", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-22T13:30:36.265660Z", "version": "2.0.3"}}]}, "published": "2024-10-21T18:15:19.760", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/01cdddde39b065074fd48f07027757783cbf5b7d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/73b078e3314d4854fd8286f3ba65c860ddd3a3dd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7b222d6cb87077faf56a687a72af1951cf78c8a9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/803b3a39cb096d8718c0aebc03fd19f11c7dc919"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c173d47b69f07cd7ca08efb4e458adbd4725d8e9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c6db81c550cea0c73bd72ef55f579991e0e4ba07"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e2a8910af01653c1c268984855629d71fb81f404"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ec79e6170bcae8a6036a4b6960f5e7e59a785601"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-120"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: cifs: Fix buffer overflow when parsing NFS reparse points", "id": "2320447", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320447"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.7", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H", "status": "draft"}, "cwe": "CWE-120", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncifs: Fix buffer overflow when parsing NFS reparse points\nReparseDataLength is sum of the InodeType size and DataBuffer size.\nSo to get DataBuffer size it is needed to subtract InodeType's size from\nReparseDataLength.\nFunction cifs_strndup_from_utf16() is currentlly accessing buf->DataBuffer\nat position after the end of the buffer because it does not subtract\nInodeType size from the length. Fix this problem and correctly subtract\nvariable len.\nMember InodeType is present only when reparse buffer is large enough. Check\nfor ReparseDataLength before accessing InodeType to prevent another invalid\nmemory access.\nMajor and minor rdev values are present also only when reparse buffer is\nlarge enough. Check for reparse buffer size before calling reparse_mkdev()."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-49996", "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": "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": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "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": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-49996\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-49996\nhttps://lore.kernel.org/linux-cve-announce/2024102138-CVE-2024-49996-0d29@gregkh/T"], "statement": "The Samba (CIFS) file system usually being mounted locally, and described vulnerability doesn't allow to crash the server (instead it allows for server to crash the client when client already mounted something from server). This is the reason why for CVSS chosen \"AV:A\" (Adjacent attack vector) and UI:R (required for client to connect to server before).", "threat_severity": "Moderate"}

{}