CVE-2026-43112

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If no path content remains, the function returns NULL.\n\nThe bug was identified via manual audit and verified using a\nstandalone test case compiled with AddressSanitizer, which\ntriggered a SEGV on affected inputs."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - A malicious SMB/DFS server can influence referral target path handling that flows through SMB client mount/DFS processing into `cifs_sanitize_prepath`. The triggering data is delivered over the network via SMB responses.\nAC:L - The trigger is a deterministic empty or delimiter-only prepath condition; no race or hard-to-control environmental condition is required. A malicious server or local mount caller can craft the relevant path form directly.\nPR:N - In the network scenario, the attacker only needs to operate the SMB/DFS endpoint that the victim client contacts and needs no privileges on the victim system. Local user-namespace reachability also exists before the final non-`FS_USERNS_MOUNT` mount denial, but the no-privilege malicious-server scenario is more severe.\nUI:R - The victim must initiate or otherwise cause an SMB/CIFS mount or DFS traversal to the attacker-controlled server. After that action, no further interaction is needed.\nS:U - The bug corrupts or reads kernel memory within the same host kernel security authority. It does not cross a separate scope such as a hypervisor, guest boundary, or IOMMU boundary.\nC:H - The immediate invalid access is a bounded read, but the same edge case can enter a path that treats memory before the prepath as part of the buffer, making this defensibly kernel memory corruption. Under the required overestimation rule, potential exploitation of kernel memory corruption is scored as high confidentiality impact.\nI:H - After the out-of-bounds read, if the preceding byte is a delimiter the old code decrements the cursor and writes a NUL before the prepath buffer. That conditional out-of-bounds write is kernel memory corruption and is scored as high integrity impact.\nA:H - The fix commit reports an AddressSanitizer SEGV on affected inputs, and the kernel path can produce invalid memory access or heap corruption. A repeatable kernel oops/panic or destabilization is therefore a high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/fs_context.c"], "versions": [{"version": "c63433a09d6ae4c226fcbc66da4c58fc189fd746", "lessThan": "a2ba20c17de8eb028f96b1d85f119d3d25655bd9", "status": "affected", "versionType": "git"}, {"version": "a31080899d5fdafcccf7f39dd214a814a2c82626", "lessThan": "fbced33599653471b4581dfe1abc7b467031f126", "status": "affected", "versionType": "git"}, {"version": "a31080899d5fdafcccf7f39dd214a814a2c82626", "lessThan": "5d4fe469fe7dbff7d874c196bb680a82f2625d95", "status": "affected", "versionType": "git"}, {"version": "a31080899d5fdafcccf7f39dd214a814a2c82626", "lessThan": "2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439", "status": "affected", "versionType": "git"}, {"version": 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When the `cifs_sanitize_prepath` function processes specially crafted input, such as an empty string or a string containing only delimiters, it can attempt to read data beyond its allocated memory buffer. 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This can be achieved by blacklisting the module.\n\nCreate a file named `/etc/modprobe.d/blacklist-cifs.conf` with the following content:\n```\nblacklist cifs\n```\nAfter creating the file, regenerate the initramfs and reboot the system for the changes to take effect.\n```bash\ndracut -f -v\nreboot\n```\nDisabling the `cifs` module will prevent the system from mounting CIFS network shares, which may impact functionality relying on this protocol."}], "x_generator": {"engine": "sadp-cli 1.0.0"}, "descriptions": [{"lang": "en", "value": "A flaw was found in the Linux kernel's CIFS (Common Internet File System) client. When the `cifs_sanitize_prepath` function processes specially crafted input, such as an empty string or a string containing only delimiters, it can attempt to read data beyond its allocated memory buffer. This out-of-bounds read can lead to a system crash, resulting in a denial of service."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "Out-of-bounds Read"}]}], "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-09-18T12:04:49.647Z"}}, {"affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}], "x_adpType": "supplier", "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:19:11.568Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43112", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:14:42.861465Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:14:43.419Z"}}], "cna": {"title": "fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 8.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - A malicious SMB/DFS server can influence referral target path handling that flows through SMB client mount/DFS processing into `cifs_sanitize_prepath`. The triggering data is delivered over the network via SMB responses.\nAC:L - The trigger is a deterministic empty or delimiter-only prepath condition; no race or hard-to-control environmental condition is required. A malicious server or local mount caller can craft the relevant path form directly.\nPR:N - In the network scenario, the attacker only needs to operate the SMB/DFS endpoint that the victim client contacts and needs no privileges on the victim system. Local user-namespace reachability also exists before the final non-`FS_USERNS_MOUNT` mount denial, but the no-privilege malicious-server scenario is more severe.\nUI:R - The victim must initiate or otherwise cause an SMB/CIFS mount or DFS traversal to the attacker-controlled server. After that action, no further interaction is needed.\nS:U - The bug corrupts or reads kernel memory within the same host kernel security authority. It does not cross a separate scope such as a hypervisor, guest boundary, or IOMMU boundary.\nC:H - The immediate invalid access is a bounded read, but the same edge case can enter a path that treats memory before the prepath as part of the buffer, making this defensibly kernel memory corruption. Under the required overestimation rule, potential exploitation of kernel memory corruption is scored as high confidentiality impact.\nI:H - After the out-of-bounds read, if the preceding byte is a delimiter the old code decrements the cursor and writes a NUL before the prepath buffer. That conditional out-of-bounds write is kernel memory corruption and is scored as high integrity impact.\nA:H - The fix commit reports an AddressSanitizer SEGV on affected inputs, and the kernel path can produce invalid memory access or heap corruption. A repeatable kernel oops/panic or destabilization is therefore a high availability impact."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "c63433a09d6ae4c226fcbc66da4c58fc189fd746", "lessThan": "a2ba20c17de8eb028f96b1d85f119d3d25655bd9", "versionType": "git"}, {"status": "affected", "version": "a31080899d5fdafcccf7f39dd214a814a2c82626", "lessThan": "fbced33599653471b4581dfe1abc7b467031f126", "versionType": "git"}, {"status": "affected", "version": "a31080899d5fdafcccf7f39dd214a814a2c82626", "lessThan": "5d4fe469fe7dbff7d874c196bb680a82f2625d95", "versionType": "git"}, {"status": "affected", "version": "a31080899d5fdafcccf7f39dd214a814a2c82626", "lessThan": "2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439", "versionType": "git"}, {"status": "affected", "version": "a31080899d5fdafcccf7f39dd214a814a2c82626", "lessThan": "86f9c23e0814cfdffda9eedf0c591c51ba209010", "versionType": "git"}, {"status": "affected", "version": "a31080899d5fdafcccf7f39dd214a814a2c82626", "lessThan": "49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3", "versionType": "git"}, {"status": "affected", "version": "a31080899d5fdafcccf7f39dd214a814a2c82626", "lessThan": "78ec5bf2f589ec7fd8f169394bfeca541b077317", "versionType": "git"}, {"status": "affected", "version": "5.15.11", "lessThan": "5.15.209", "versionType": "semver"}], "programFiles": ["fs/smb/client/fs_context.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.16"}, {"status": "unaffected", "version": "0", "lessThan": "5.16", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.136", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.83", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.24", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.14", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/client/fs_context.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/a2ba20c17de8eb028f96b1d85f119d3d25655bd9"}, {"url": "https://git.kernel.org/stable/c/fbced33599653471b4581dfe1abc7b467031f126"}, {"url": "https://git.kernel.org/stable/c/5d4fe469fe7dbff7d874c196bb680a82f2625d95"}, {"url": "https://git.kernel.org/stable/c/2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439"}, {"url": "https://git.kernel.org/stable/c/86f9c23e0814cfdffda9eedf0c591c51ba209010"}, {"url": "https://git.kernel.org/stable/c/49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3"}, {"url": "https://git.kernel.org/stable/c/78ec5bf2f589ec7fd8f169394bfeca541b077317"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath\n\nWhen cifs_sanitize_prepath is called with an empty string or a string\ncontaining only delimiters (e.g., \"/\"), the current logic attempts to\ncheck *(cursor2 - 1) before cursor2 has advanced. This results in an\nout-of-bounds read.\n\nThis patch adds an early exit check after stripping prepended\ndelimiters. If no path content remains, the function returns NULL.\n\nThe bug was identified via manual audit and verified using a\nstandalone test case compiled with AddressSanitizer, which\ntriggered a SEGV on affected inputs."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.209", "versionStartIncluding": "5.15.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.175", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.136", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.83", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.24", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.14", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "5.16"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:25:59.624Z"}}}, "cveMetadata": {"cveId": "CVE-2026-43112", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:06:13.909Z", "dateReserved": "2026-05-01T14:12:55.986Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-06T07:40:38.563Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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string or a string\ncontaining only delimiters (e.g., \"/\"), the current logic attempts to\ncheck *(cursor2 - 1) before cursor2 has advanced. This results in an\nout-of-bounds read.\n\nThis patch adds an early exit check after stripping prepended\ndelimiters. If no path content remains, the function returns NULL.\n\nThe bug was identified via manual audit and verified using a\nstandalone test case compiled with AddressSanitizer, which\ntriggered a SEGV on affected inputs."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs/smb/cliente: correcci\u00f3n de lectura fuera de l\u00edmites en cifs_sanitize_prepath\n\nCuando se llama a cifs_sanitize_prepath con una cadena vac\u00eda o una cadena que contiene solo delimitadores (p. ej., \u2019/\u2019), la l\u00f3gica actual intenta verificar *(cursor2 - 1) antes de que cursor2 haya avanzado. Esto resulta en una lectura fuera de l\u00edmites.\n\nEste parche a\u00f1ade una verificaci\u00f3n de salida temprana despu\u00e9s de eliminar los delimitadores antepuestos. Si no queda contenido de ruta, la funci\u00f3n devuelve NULL.\n\nEl error fue identificado mediante una auditor\u00eda manual y verificado usando un caso de prueba independiente compilado con AddressSanitizer, lo que provoc\u00f3 un SEGV en entradas afectadas."}], "id": "CVE-2026-43112", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", 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