CVE-2026-43226

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43226", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.994Z", "datePublished": "2026-05-06T11:28:24.952Z", "dateUpdated": "2026-08-05T12:26:42.896Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:42.896Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: No shortcut out of RDS_CONN_ERROR\n\nRDS connections carry a state \"rds_conn_path::cp_state\"\nand transitions from one state to another and are conditional\nupon an expected state: \"rds_conn_path_transition.\"\n\nThere is one exception to this conditionality, which is\n\"RDS_CONN_ERROR\" that can be enforced by \"rds_conn_path_drop\"\nregardless of what state the condition is currently in.\n\nBut as soon as a connection enters state \"RDS_CONN_ERROR\",\nthe connection handling code expects it to go through the\nshutdown-path.\n\nThe RDS/TCP multipath changes added a shortcut out of\n\"RDS_CONN_ERROR\" straight back to \"RDS_CONN_CONNECTING\"\nvia \"rds_tcp_accept_one_path\" (e.g. after \"rds_tcp_state_change\").\n\nA subsequent \"rds_tcp_reset_callbacks\" can then transition\nthe state to \"RDS_CONN_RESETTING\" with a shutdown-worker queued.\n\nThat'll trip up \"rds_conn_init_shutdown\", which was\nnever adjusted to handle \"RDS_CONN_RESETTING\" and subsequently\ndrops the connection with the dreaded \"DR_INV_CONN_STATE\",\nwhich leaves \"RDS_SHUTDOWN_WORK_QUEUED\" on forever.\n\nSo we do two things here:\n\na) Don't shortcut \"RDS_CONN_ERROR\", but take the longer\n path through the shutdown code.\n\nb) Add \"RDS_CONN_RESETTING\" to the expected states in\n \"rds_conn_init_shutdown\" so that we won't error out\n and get stuck, if we ever hit weird state transitions\n like this again.\""}], "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 code is in the RDS/TCP passive accept path reached by remote TCP connections to the kernel RDS listener on port 16385. No local syscall or physical access is required in a deployment where RDS/TCP is enabled and reachable.\nAC:L - The attacker can drive the relevant error and reconnect sequence by opening, closing, and reconnecting TCP connections; the queued-shutdown timing is repeatable and under attacker influence. There is no requirement for a rare victim-controlled state beyond an active RDS/TCP deployment.\nPR:N - The accept path runs before any RDS authentication or credential check, and RDS/TCP does not authenticate the remote peer before reaching rds_tcp_accept_one_path. A network attacker only needs the ability to connect to the listener.\nUI:N - Exploitation does not require a user to open a file, mount anything, or perform an action. The attacker triggers it through network connection sequencing.\nS:U - The impact remains within the kernel/RDS networking security authority. It does not cross a VM, IOMMU, or other separate security boundary.\nC:N - The bug is a connection state-machine error and I found no memory disclosure path, out-of-bounds read, or use-after-free primitive. It does not expose kernel or application data.\nI:N - The fix addresses invalid RDS connection state transitions, not memory corruption or unauthorized data modification. I found no arbitrary write, control-flow hijack, or integrity-impacting primitive.\nA:H - The invalid shortcut can leave an RDS/TCP connection path stuck with shutdown/reconnect work state permanently wedged, denying RDS availability for affected peer paths until external recovery. Because it is remotely and repeatedly triggerable against a network service, the availability impact is high."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/rds/connection.c", "net/rds/tcp_listen.c"], "versions": [{"version": "5916e2c1554f3e36f770401c989c3c7fadf619ca", "lessThan": "9bcd7c00691a2db9745817d5ea79262a503b135c", "status": "affected", "versionType": "git"}, {"version": "5916e2c1554f3e36f770401c989c3c7fadf619ca", "lessThan": "a179ac7be8f5a650d0068040705f4cddd6ca369c", "status": "affected", "versionType": "git"}, {"version": "5916e2c1554f3e36f770401c989c3c7fadf619ca", "lessThan": "19e384a7d00d888303a8285977cdf1970c6cccd6", "status": "affected", "versionType": "git"}, {"version": "5916e2c1554f3e36f770401c989c3c7fadf619ca", "lessThan": "f0f729bdffb08af32e0f54521b81b8a9e0321f16", "status": "affected", "versionType": "git"}, {"version": "5916e2c1554f3e36f770401c989c3c7fadf619ca", "lessThan": "81248b1eb3c5954cc1fc7b33b7c03e34d20cb8c8", "status": "affected", "versionType": "git"}, {"version": "5916e2c1554f3e36f770401c989c3c7fadf619ca", "lessThan": "899ef00963ce76f9fc421a7d02335fe4ead6389b", "status": "affected", "versionType": "git"}, {"version": "5916e2c1554f3e36f770401c989c3c7fadf619ca", "lessThan": "9ff599a9be784a808c36765086e3db2144aa3b66", "status": "affected", "versionType": "git"}, {"version": "5916e2c1554f3e36f770401c989c3c7fadf619ca", "lessThan": "ad22d24be635c6beab6a1fdd3f8b1f3c478d15da", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/rds/connection.c", "net/rds/tcp_listen.c"], "versions": [{"version": "4.8", "status": "affected"}, {"version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.252", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.202", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.165", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.128", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.6", "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": "4.8", "versionEndExcluding": "5.10.252"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.15.202"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.1.165"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.6.128"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.12.75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.18.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.19.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9bcd7c00691a2db9745817d5ea79262a503b135c"}, {"url": "https://git.kernel.org/stable/c/a179ac7be8f5a650d0068040705f4cddd6ca369c"}, {"url": "https://git.kernel.org/stable/c/19e384a7d00d888303a8285977cdf1970c6cccd6"}, {"url": "https://git.kernel.org/stable/c/f0f729bdffb08af32e0f54521b81b8a9e0321f16"}, {"url": "https://git.kernel.org/stable/c/81248b1eb3c5954cc1fc7b33b7c03e34d20cb8c8"}, {"url": "https://git.kernel.org/stable/c/899ef00963ce76f9fc421a7d02335fe4ead6389b"}, {"url": "https://git.kernel.org/stable/c/9ff599a9be784a808c36765086e3db2144aa3b66"}, {"url": "https://git.kernel.org/stable/c/ad22d24be635c6beab6a1fdd3f8b1f3c478d15da"}], "title": "net/rds: No shortcut out of RDS_CONN_ERROR", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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the\nshutdown-path.\n\nThe RDS/TCP multipath changes added a shortcut out of\n\"RDS_CONN_ERROR\" straight back to \"RDS_CONN_CONNECTING\"\nvia \"rds_tcp_accept_one_path\" (e.g. after \"rds_tcp_state_change\").\n\nA subsequent \"rds_tcp_reset_callbacks\" can then transition\nthe state to \"RDS_CONN_RESETTING\" with a shutdown-worker queued.\n\nThat'll trip up \"rds_conn_init_shutdown\", which was\nnever adjusted to handle \"RDS_CONN_RESETTING\" and subsequently\ndrops the connection with the dreaded \"DR_INV_CONN_STATE\",\nwhich leaves \"RDS_SHUTDOWN_WORK_QUEUED\" on forever.\n\nSo we do two things here:\n\na) Don't shortcut \"RDS_CONN_ERROR\", but take the longer\n path through the shutdown code.\n\nb) Add \"RDS_CONN_RESETTING\" to the expected states in\n \"rds_conn_init_shutdown\" so that we won't error out\n and get stuck, if we ever hit weird state transitions\n like this again.\""}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/rds: Sin atajo para salir de RDS_CONN_ERROR\n\nLas conexiones RDS llevan un estado \u2019rds_conn_path::cp_state\u2019 y las transiciones de un estado a otro son condicionales a un estado esperado: \u2019rds_conn_path_transition\u2019.\n\nHay una excepci\u00f3n a esta condicionalidad, que es \u2019RDS_CONN_ERROR\u2019 que puede ser forzado por \u2019rds_conn_path_drop\u2019 independientemente del estado en el que se encuentre actualmente la conexi\u00f3n.\n\nPero tan pronto como una conexi\u00f3n entra en el estado \u2019RDS_CONN_ERROR\u2019, el c\u00f3digo de manejo de la conexi\u00f3n espera que pase por la ruta de apagado.\n\nLos cambios de multipath de RDS/TCP a\u00f1adieron un atajo para salir de \u2019RDS_CONN_ERROR\u2019 directamente de vuelta a \u2019RDS_CONN_CONNECTING\u2019 a trav\u00e9s de \u2019rds_tcp_accept_one_path\u2019 (p. ej., despu\u00e9s de \u2019rds_tcp_state_change\u2019).\n\nUna \u2019rds_tcp_reset_callbacks\u2019 subsiguiente puede entonces hacer la transici\u00f3n del estado a \u2019RDS_CONN_RESETTING\u2019 con un trabajador de apagado en cola.\n\nEso har\u00e1 tropezar a \u2019rds_conn_init_shutdown\u2019, que nunca fue ajustado para manejar \u2019RDS_CONN_RESETTING\u2019 y posteriormente descarta la conexi\u00f3n con el temido \u2019DR_INV_CONN_STATE\u2019, lo que deja \u2019RDS_SHUTDOWN_WORK_QUEUED\u2019 activado para siempre.\n\nAs\u00ed que hacemos dos cosas aqu\u00ed:\n\na) No atajar \u2019RDS_CONN_ERROR\u2019, sino tomar la ruta m\u00e1s larga a trav\u00e9s del c\u00f3digo de apagado.\n\nb) A\u00f1adir \u2019RDS_CONN_RESETTING\u2019 a los estados esperados en \u2019rds_conn_init_shutdown\u2019 para que no fallemos y nos quedemos atascados, si alguna vez nos encontramos con transiciones de estado extra\u00f1as como esta de nuevo."}], "id": "CVE-2026-43226", "lastModified": "2026-11-11T20:10:00.273", "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": "2026-05-06T12:16:42.393", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/19e384a7d00d888303a8285977cdf1970c6cccd6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/81248b1eb3c5954cc1fc7b33b7c03e34d20cb8c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/899ef00963ce76f9fc421a7d02335fe4ead6389b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9bcd7c00691a2db9745817d5ea79262a503b135c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9ff599a9be784a808c36765086e3db2144aa3b66"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a179ac7be8f5a650d0068040705f4cddd6ca369c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ad22d24be635c6beab6a1fdd3f8b1f3c478d15da"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f0f729bdffb08af32e0f54521b81b8a9e0321f16"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net/rds: No shortcut out of RDS_CONN_ERROR", "id": "2467167", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467167"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-372", "details": ["A flaw was found in the Linux kernel's Reliable Datagram Sockets (RDS) component. Due to an incorrect state transition, an RDS connection can bypass its expected shutdown process. This can lead to the connection becoming permanently stuck in a shutdown-queued state, potentially causing a denial of service by preventing further connection handling."], "name": "CVE-2026-43226", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43226\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43226\nhttps://lore.kernel.org/linux-cve-announce/2026050654-CVE-2026-43226-496c@gregkh/T"], "threat_severity": "Moderate"}

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