CVE-2026-72356

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72356", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.921Z", "datePublished": "2026-08-15T05:55:57.464Z", "dateUpdated": "2026-08-17T05:43:14.352Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:43:14.352Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix missing credit release on failure in cifs_issue_read()\n\nFix missing release of credits in the failure path in cifs_issue_read()\nlest retrying the subreq just overwrites the credits value."}], "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 bug is in the CIFS/SMB client read path reached over TCP/445 when netfs issues reads; a malicious or compromised remote SMB server can provoke replayable async_readv failures (-EAGAIN/-ECONNABORTED) after credits are reserved, matching prior client-side CIFS credit CVEs scored as Network.\nAC:L - The remote server controls both sides of the retry: it can reset the connection or force reconnects to return replayable errors, and netfs reissues the same subrequest deterministically; no race or memory-layout condition outside attacker control is required.\nPR:N - The attacker is the remote SMB peer and needs no account, credentials, or local privileges on the victim; exploitation occurs during normal read/writeback I/O on an already-established CIFS mount (fstab, autofs, Azure Files, enterprise NAS).\nUI:N - Once a CIFS mount exists, the server triggers the flaw by its responses to client-initiated reads with no further victim interaction; mounting is a deployment precondition, not an action required at exploit time per kernel CNA convention for client filesystem bugs.\nS:U - Impact is confined to SMB credit/in_flight accounting and I/O scheduling within the client kernel; it does not cross VM, IOMMU, or sandbox security boundaries.\nC:N - The flaw leaks SMB protocol credits and misaccounts counters; it does not read or disclose kernel memory, user data, or pointers, and provides no information-disclosure primitive.\nI:N - No memory corruption, type confusion, or arbitrary write occurs; the only effect is permanently losing credits from the server pool when a failed read subrequest is retried without releasing them first.\nA:H - Each leaked credit permanently depletes server->credits; repeated retries exhaust the pool until smb2_wait_mtu_credits blocks all CIFS I/O on that connection in uninterruptible waits, causing system-wide hang/DoS for processes using the mount."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/file.c"], "versions": [{"version": "69c3c023af25edb5433a2db824d3e7cc328f0183", "lessThan": "b9ee1f0347bf56d019ca28ddff090234bb45b05c", "status": "affected", "versionType": "git"}, {"version": "69c3c023af25edb5433a2db824d3e7cc328f0183", "lessThan": "86652704a7fd41a5a8459027e08640bbd1952826", "status": "affected", "versionType": "git"}, {"version": "69c3c023af25edb5433a2db824d3e7cc328f0183", "lessThan": "3a303f985c6bec8787c2ad4a16b39c14c5bcd765", "status": "affected", "versionType": "git"}, {"version": "69c3c023af25edb5433a2db824d3e7cc328f0183", "lessThan": "c16b8c4cfb4fe2244cc33e469a93c1ab8684146b", "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/client/file.c"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.10", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b9ee1f0347bf56d019ca28ddff090234bb45b05c"}, {"url": "https://git.kernel.org/stable/c/86652704a7fd41a5a8459027e08640bbd1952826"}, {"url": "https://git.kernel.org/stable/c/3a303f985c6bec8787c2ad4a16b39c14c5bcd765"}, {"url": "https://git.kernel.org/stable/c/c16b8c4cfb4fe2244cc33e469a93c1ab8684146b"}], "title": "cifs: Fix missing credit release on failure in cifs_issue_read()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/client/file.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b9ee1f0347bf56d019ca28ddff090234bb45b05c", "status": "affected", "version": "69c3c023af25edb5433a2db824d3e7cc328f0183", "versionType": "git"}, {"lessThan": "86652704a7fd41a5a8459027e08640bbd1952826", "status": "affected", "version": "69c3c023af25edb5433a2db824d3e7cc328f0183", "versionType": "git"}, {"lessThan": "3a303f985c6bec8787c2ad4a16b39c14c5bcd765", "status": "affected", "version": "69c3c023af25edb5433a2db824d3e7cc328f0183", "versionType": "git"}, {"lessThan": "c16b8c4cfb4fe2244cc33e469a93c1ab8684146b", "status": "affected", "version": "69c3c023af25edb5433a2db824d3e7cc328f0183", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/client/file.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.10"}, {"lessThan": "6.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix missing credit release on failure in cifs_issue_read()\n\nFix missing release of credits in the failure path in cifs_issue_read()\nlest retrying the subreq just overwrites the credits value."}], "id": "CVE-2026-72356", "lastModified": "2026-08-17T06:18:39.780", "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"}]}, "published": "2026-08-15T06:22:09.053", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3a303f985c6bec8787c2ad4a16b39c14c5bcd765"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/86652704a7fd41a5a8459027e08640bbd1952826"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b9ee1f0347bf56d019ca28ddff090234bb45b05c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c16b8c4cfb4fe2244cc33e469a93c1ab8684146b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: cifs: Fix missing credit release on failure in cifs_issue_read()", "id": "2516409", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516409"}, "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-772", "details": ["A flaw was found in the CIFS (Common Internet File System) component of the Linux kernel. A missing credit release on failure in the `cifs_issue_read()` function can lead to a situation where retrying a sub-request overwrites existing credit values. This resource management issue could potentially lead to system instability or a denial of service."], "name": "CVE-2026-72356", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72356\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72356\nhttps://lore.kernel.org/linux-cve-announce/2026081513-CVE-2026-72356-350b@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[69c3c023af25edb5433a2db824d3e7cc328f0183,b9ee1f0347bf56d019ca28ddff090234bb45b05c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[69c3c023af25edb5433a2db824d3e7cc328f0183,86652704a7fd41a5a8459027e08640bbd1952826)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[69c3c023af25edb5433a2db824d3e7cc328f0183,3a303f985c6bec8787c2ad4a16b39c14c5bcd765)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[69c3c023af25edb5433a2db824d3e7cc328f0183,c16b8c4cfb4fe2244cc33e469a93c1ab8684146b)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T19:45:12.094483+00:00", "updated": "2026-08-18T19:30:04.223868+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}