CVE-2026-43055

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When a write command fd_execute_rw_aio() is executed,\nwe may get a bogus ki_write_stream value, causing unintended write\nfailure status when checking iocb->ki_write_stream > max_write_streams\nin the block device.\n\nLet's just use kzalloc_flex when allocating the aio_cmd and let\nki_write_stream=0 to fix this issue."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable FILEIO backend can be reached through network SCSI target fabrics, especially the in-kernel iSCSI target over TCP, by sending SCSI WRITE commands to an exported fileio LUN.\nAC:L - In an affected deployment with fileio async I/O enabled, triggering only requires ordinary WRITE CDB/DataOUT traffic; there is no race or attacker-uncontrolled timing condition.\nPR:N - iSCSI target supports no-auth/dynamic-ACL deployments, and in that reasonable worst-case a remote initiator can log in and issue writes without credentials.\nUI:N - No victim user action is needed after the target is configured and listening; the attacker sends protocol commands directly.\nS:U - The impact remains within the kernel target/storage service authority and does not cross a VM, IOMMU, or separate security boundary.\nC:N - The uninitialized field is a write-stream selector byte used internally and is not returned to the attacker or used as a memory read primitive.\nI:N - The bug causes bogus stream selection or write rejection, but it does not provide unauthorized modification of kernel memory or logical storage contents.\nA:H - A stale nonzero stream value can make valid block-device writes fail with CHECK CONDITION, and a remote initiator can repeatedly trigger write failure against the exported LUN."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/target/target_core_file.c"], "versions": [{"version": "732f25a2895a8c1c54fb56544f0b1e23770ef4d7", "lessThan": "ce54802fe6bb78eb0feffc66fed6a45d41ffc3ab", "status": "affected", "versionType": "git"}, {"version": "732f25a2895a8c1c54fb56544f0b1e23770ef4d7", "lessThan": "4eaff1728d0e69b95933412241bbccf4f797dba8", "status": "affected", "versionType": "git"}, {"version": "732f25a2895a8c1c54fb56544f0b1e23770ef4d7", "lessThan": "01f784fc9d0ab2a6dac45ee443620e517cb2a19b", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/target/target_core_file.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.16", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ce54802fe6bb78eb0feffc66fed6a45d41ffc3ab"}, {"url": "https://git.kernel.org/stable/c/4eaff1728d0e69b95933412241bbccf4f797dba8"}, {"url": "https://git.kernel.org/stable/c/01f784fc9d0ab2a6dac45ee443620e517cb2a19b"}], "title": "scsi: target: file: Use kzalloc_flex for aio_cmd", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43055", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:14:04.426072Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-457", "description": "CWE-457 Use of Uninitialized Variable"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:06:11.626Z"}}]}}

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When a write command fd_execute_rw_aio() is executed,\nwe may get a bogus ki_write_stream value, causing unintended write\nfailure status when checking iocb->ki_write_stream > max_write_streams\nin the block device.\n\nLet's just use kzalloc_flex when allocating the aio_cmd and let\nki_write_stream=0 to fix this issue."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.22", "versionStartIncluding": "6.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.12", "versionStartIncluding": "6.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "6.16"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:25:36.045Z"}}}, "cveMetadata": {"cveId": "CVE-2026-43055", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:06:11.626Z", "dateReserved": "2026-05-01T14:12:55.980Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-01T14:15:48.139Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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When a write command fd_execute_rw_aio() is executed,\nwe may get a bogus ki_write_stream value, causing unintended write\nfailure status when checking iocb->ki_write_stream > max_write_streams\nin the block device.\n\nLet's just use kzalloc_flex when allocating the aio_cmd and let\nki_write_stream=0 to fix this issue."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nscsi: target: file: Usar kzalloc_flex para aio_cmd\n\nEl target_core_file no inicializa el aio_cmd -> iocb para el ki_write_stream. Cuando un comando de escritura fd_execute_rw_aio() es ejecutado, podemos obtener un valor err\u00f3neo de ki_write_stream, causando un estado de fallo de escritura no intencionado al verificar iocb -> ki_write_stream > max_write_streams en el dispositivo de bloques.\n\nSimplemente usemos kzalloc_flex al asignar el aio_cmd y dejemos ki_write_stream=0 para solucionar este problema."}], "id": "CVE-2026-43055", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43055", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:14:04.426072Z", "version": "2.0.3"}}]}, "published": "2026-05-01T15:16:52.040", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/01f784fc9d0ab2a6dac45ee443620e517cb2a19b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4eaff1728d0e69b95933412241bbccf4f797dba8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ce54802fe6bb78eb0feffc66fed6a45d41ffc3ab"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-457"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

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