CVE-2026-98449

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98449", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.349Z", "datePublished": "2026-10-18T15:14:59.772Z", "dateUpdated": "2026-11-10T18:15:14.034Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-11-10T18:15:14.034Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: delete compound mids on send failure before unlock\n\nWhen sending a compound request fails, smb_send_rqst() kicks off a\nreconnect. compound_send_recv() still has those mids on pending_mid_q,\nbut it unlocks the server without removing them first.\n\nDuring reconnect, cifs_abort_connection() walks pending_mid_q and runs\neach mid callback. With no response yet, those callbacks return credits\nand drop in_flight. Then compound_send_recv()'s send-error path returns\nthe same credits again. in_flight ends up decremented twice and\nsmb2_add_credits() WARNs.\n\nsyzbot hits this during SMB2_negotiate when the socket send fails.\n\ncifs_call_async() already calls delete_mid() before unlock on send\nfailure. Do the same for compound chains and set cancelled_mid[] so the\nout: path does not delete them again."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/transport.c"], "versions": [{"version": "ee258d79159afed52ca9372aeb9c1a51e89b32ee", "lessThan": "36a2ba21d38a86bae84441e4c8d5b10653ef341a", "status": "affected", "versionType": "git"}, {"version": "ee258d79159afed52ca9372aeb9c1a51e89b32ee", "lessThan": "59d30bdc3dd6fd3a8990f59bc7a137b1cbb3ed4e", "status": "affected", "versionType": "git"}, {"version": "ee258d79159afed52ca9372aeb9c1a51e89b32ee", "lessThan": "70783946f3b5d0c06ec7df0f5e7bec2bfad24efb", "status": "affected", "versionType": "git"}, {"version": "ee258d79159afed52ca9372aeb9c1a51e89b32ee", "lessThan": "8f6f8a48399f82f4a83f7b9f25b9707e0062a4f9", "status": "affected", "versionType": "git"}, {"version": "3c57a0be487088b08d9c88998f911eb4a7ba36e4", "status": "affected", "versionType": "git"}, {"version": "4.20.11", "lessThan": "4.21", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/transport.c"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.117", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.61", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.9", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "5.0", "versionEndExcluding": "6.12.117"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.61"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.2.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/36a2ba21d38a86bae84441e4c8d5b10653ef341a"}, {"url": "https://git.kernel.org/stable/c/59d30bdc3dd6fd3a8990f59bc7a137b1cbb3ed4e"}, {"url": "https://git.kernel.org/stable/c/70783946f3b5d0c06ec7df0f5e7bec2bfad24efb"}, {"url": "https://git.kernel.org/stable/c/8f6f8a48399f82f4a83f7b9f25b9707e0062a4f9"}], "title": "smb: client: delete compound mids on send failure before unlock", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/client/transport.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "36a2ba21d38a86bae84441e4c8d5b10653ef341a", "status": "affected", "version": "ee258d79159afed52ca9372aeb9c1a51e89b32ee", "versionType": "git"}, {"lessThan": "59d30bdc3dd6fd3a8990f59bc7a137b1cbb3ed4e", "status": "affected", "version": "ee258d79159afed52ca9372aeb9c1a51e89b32ee", "versionType": "git"}, {"lessThan": "70783946f3b5d0c06ec7df0f5e7bec2bfad24efb", "status": "affected", "version": "ee258d79159afed52ca9372aeb9c1a51e89b32ee", "versionType": "git"}, {"lessThan": "8f6f8a48399f82f4a83f7b9f25b9707e0062a4f9", "status": "affected", "version": "ee258d79159afed52ca9372aeb9c1a51e89b32ee", "versionType": "git"}, {"status": "affected", "version": "3c57a0be487088b08d9c88998f911eb4a7ba36e4", "versionType": "git"}, {"lessThan": "4.21", "status": "affected", "version": "4.20.11", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/client/transport.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.0"}, {"lessThan": "5.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.117", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.61", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\nsmb: client: delete compound mids on send failure before unlock\n\nWhen sending a compound request fails, smb_send_rqst() kicks off a\nreconnect. compound_send_recv() still has those mids on pending_mid_q,\nbut it unlocks the server without removing them first.\n\nDuring reconnect, cifs_abort_connection() walks pending_mid_q and runs\neach mid callback. With no response yet, those callbacks return credits\nand drop in_flight. Then compound_send_recv()'s send-error path returns\nthe same credits again. in_flight ends up decremented twice and\nsmb2_add_credits() WARNs.\n\nsyzbot hits this during SMB2_negotiate when the socket send fails.\n\ncifs_call_async() already calls delete_mid() before unlock on send\nfailure. Do the same for compound chains and set cancelled_mid[] so the\nout: path does not delete them again."}], "id": "CVE-2026-98449", "lastModified": "2026-11-10T19:22:24.657", "metrics": {}, "published": "2026-10-18T16:16:55.237", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/36a2ba21d38a86bae84441e4c8d5b10653ef341a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/59d30bdc3dd6fd3a8990f59bc7a137b1cbb3ed4e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/70783946f3b5d0c06ec7df0f5e7bec2bfad24efb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8f6f8a48399f82f4a83f7b9f25b9707e0062a4f9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: smb: client: delete compound mids on send failure before unlock", "id": "2554895", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2554895"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-459", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsmb: client: delete compound mids on send failure before unlock\nWhen sending a compound request fails, smb_send_rqst() kicks off a\nreconnect. compound_send_recv() still has those mids on pending_mid_q,\nbut it unlocks the server without removing them first.\nDuring reconnect, cifs_abort_connection() walks pending_mid_q and runs\neach mid callback. With no response yet, those callbacks return credits\nand drop in_flight. Then compound_send_recv()'s send-error path returns\nthe same credits again. in_flight ends up decremented twice and\nsmb2_add_credits() WARNs.\nsyzbot hits this during SMB2_negotiate when the socket send fails.\ncifs_call_async() already calls delete_mid() before unlock on send\nfailure. Do the same for compound chains and set cancelled_mid[] so the\nout: path does not delete them again.", "A flaw was found in the Linux kernel's SMB (Server Message Block) client. This issue may allow a remote attacker or malicious server to trigger a Denial of Service (DoS) by inducing network transmission failures during compound request processing. Because the client releases its connection lock without first clearing pending requests from the queue upon a send failure, a subsequent reconnection attempt improperly accounts for tracking credits twice. This error leads to internal state corruption, kernel warnings, and potential system instability."], "name": "CVE-2026-98449", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98449\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98449\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98449.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ee258d79159afed52ca9372aeb9c1a51e89b32ee,70783946f3b5d0c06ec7df0f5e7bec2bfad24efb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ee258d79159afed52ca9372aeb9c1a51e89b32ee,8f6f8a48399f82f4a83f7b9f25b9707e0062a4f9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "3c57a0be487088b08d9c88998f911eb4a7ba36e4"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[4.20.11,4.21)"}}], "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": "5.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.9,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc5,*]"}}], "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": "2026-10-18T16:30:13.919175+00:00", "updated": "2026-10-20T13:15:14.190893+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}