CVE-2026-31638 (GCVE-0-2026-31638)
Vulnerability from cvelistv5 – Published: 2026-04-24 14:44 – Updated: 2026-10-19 18:56
VLAI
EPSS
VEX
Title
rxrpc: Only put the call ref if one was acquired
Summary
In the Linux kernel, the following vulnerability has been resolved:
rxrpc: Only put the call ref if one was acquired
rxrpc_input_packet_on_conn() can process a to-client packet after the
current client call on the channel has already been torn down. In that
case chan->call is NULL, rxrpc_try_get_call() returns NULL and there is
no reference to drop.
The client-side implicit-end error path does not account for that and
unconditionally calls rxrpc_put_call(). This turns a protocol error
path into a kernel crash instead of rejecting the packet.
Only drop the call reference if one was actually acquired. Keep the
existing protocol error handling unchanged.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:11 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
5e6ef4f1017c7f844e305283bbd8875af475e2fc , < b8f66447448d6c305a51413a67ec8ed26aa7d1dd
(git)
Affected: 5e6ef4f1017c7f844e305283bbd8875af475e2fc , < 0c156aff8a2d4fa0d61db7837641975cf0e5452d (git) Affected: 5e6ef4f1017c7f844e305283bbd8875af475e2fc , < 8299ca146489664e3c0c90a3b8900d8335b1ede4 (git) Affected: 5e6ef4f1017c7f844e305283bbd8875af475e2fc , < 9fb09861e2b8d1abfe2efaf260c9f1d30080ea38 (git) Affected: 5e6ef4f1017c7f844e305283bbd8875af475e2fc , < 6331f1b24a3e85465f6454e003a3e6c22005a5c5 (git) |
guessed | |
| Linux | Linux |
Affected:
6.2
Unaffected: 0 , < 6.2 (semver) Unaffected: 6.6.135 , ≤ 6.6.* (semver) Unaffected: 6.12.82 , ≤ 6.12.* (semver) Unaffected: 6.18.23 , ≤ 6.18.* (semver) Unaffected: 6.19.13 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-31638",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:11:27.061889Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-476",
"description": "CWE-476 NULL Pointer Dereference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-19T18:56:01.209Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/rxrpc/io_thread.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "b8f66447448d6c305a51413a67ec8ed26aa7d1dd",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
},
{
"lessThan": "0c156aff8a2d4fa0d61db7837641975cf0e5452d",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
},
{
"lessThan": "8299ca146489664e3c0c90a3b8900d8335b1ede4",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
},
{
"lessThan": "9fb09861e2b8d1abfe2efaf260c9f1d30080ea38",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
},
{
"lessThan": "6331f1b24a3e85465f6454e003a3e6c22005a5c5",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/rxrpc/io_thread.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.2"
},
{
"lessThan": "6.2",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.135",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.82",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.23",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.135",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.82",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.23",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.13",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "6.2",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Only put the call ref if one was acquired\n\nrxrpc_input_packet_on_conn() can process a to-client packet after the\ncurrent client call on the channel has already been torn down. In that\ncase chan-\u003ecall is NULL, rxrpc_try_get_call() returns NULL and there is\nno reference to drop.\n\nThe client-side implicit-end error path does not account for that and\nunconditionally calls rxrpc_put_call(). This turns a protocol error\npath into a kernel crash instead of rejecting the packet.\n\nOnly drop the call reference if one was actually acquired. Keep the\nexisting protocol error handling unchanged."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - RXRPC runs over UDP and the vulnerable path is reached by received to-client RXRPC packets processed by the kernel RXRPC I/O thread. A malicious remote RXRPC peer can send the crafted packet after a client call has been torn down.\nAC:L - The attacker-controlled peer can observe the connection/call values during the normal exchange and choose when to send a packet with a higher callNumber after teardown. No hard-to-win race or external condition is required.\nPR:N - The packet receive path does not require the attacker to have local credentials or kernel capabilities. Any remote peer able to send matching RXRPC packets for an extant client connection can reach the vulnerable logic.\nUI:N - Once the victim system has an RXRPC client connection, exploitation is triggered by network packets alone. No interactive victim action is needed at the point of exploitation.\nS:U - The impact is within the same kernel security authority. This is not a VM escape, IOMMU bypass, or cross-scope sandbox boundary violation.\nC:N - The bug is an unconditional rxrpc_put_call(NULL), producing a NULL pointer dereference rather than a controllable read primitive. No information disclosure is apparent from the fault.\nI:N - The defect does not corrupt attacker-controlled memory or provide a write primitive. It is a protocol error path converted into a NULL dereference crash.\nA:H - Dereferencing the NULL call pointer in rxrpc_put_call() can oops or panic the kernel. A remote peer can repeat the trigger against vulnerable clients, causing high availability impact."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:24:03.234Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b8f66447448d6c305a51413a67ec8ed26aa7d1dd"
},
{
"url": "https://git.kernel.org/stable/c/0c156aff8a2d4fa0d61db7837641975cf0e5452d"
},
{
"url": "https://git.kernel.org/stable/c/8299ca146489664e3c0c90a3b8900d8335b1ede4"
},
{
"url": "https://git.kernel.org/stable/c/9fb09861e2b8d1abfe2efaf260c9f1d30080ea38"
},
{
"url": "https://git.kernel.org/stable/c/6331f1b24a3e85465f6454e003a3e6c22005a5c5"
}
],
"title": "rxrpc: Only put the call ref if one was acquired",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-31638",
"datePublished": "2026-04-24T14:44:52.122Z",
"dateReserved": "2026-03-09T15:48:24.125Z",
"dateUpdated": "2026-10-19T18:56:01.209Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-31638",
"date": "2026-11-15",
"epss": "0.00441",
"percentile": "0.38817"
},
"microsoft_vex": {
"current_release_date": "2026-05-01T14:39:46.000Z",
"cve": "CVE-2026-31638",
"id": "msrc_CVE-2026-31638",
"initial_release_date": "2026-04-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "2",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "rxrpc: Only put the call ref if one was acquired",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31638.json",
"version": "5"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/rxrpc/io_thread.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "b8f66447448d6c305a51413a67ec8ed26aa7d1dd",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
},
{
"lessThan": "0c156aff8a2d4fa0d61db7837641975cf0e5452d",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
},
{
"lessThan": "8299ca146489664e3c0c90a3b8900d8335b1ede4",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
},
{
"lessThan": "9fb09861e2b8d1abfe2efaf260c9f1d30080ea38",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
},
{
"lessThan": "6331f1b24a3e85465f6454e003a3e6c22005a5c5",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/rxrpc/io_thread.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.2"
},
{
"lessThan": "6.2",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.135",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.82",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.23",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "D6A8AD2A-FCEB-42B6-8B79-66822D8E7C37",
"versionEndExcluding": "6.6.135",
"versionStartIncluding": "6.2.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "02904CAE-71D2-45B3-9EC3-F6A9D18B6307",
"versionEndExcluding": "6.12.82",
"versionStartIncluding": "6.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "E9E09FDD-9EE3-4A56-92E2-2B30AFD0072F",
"versionEndExcluding": "6.18.23",
"versionStartIncluding": "6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "1490EF9B-9080-481C-8D22-1306AAE664E4",
"versionEndExcluding": "6.19.13",
"versionStartIncluding": "6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:-:*:*:*:*:*:*",
"matchCriteriaId": "3ADCCCEE-143A-4B48-9B2A-0CB97BD385DE",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*",
"matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*",
"matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*",
"matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*",
"matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*",
"matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*",
"matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*",
"matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Only put the call ref if one was acquired\n\nrxrpc_input_packet_on_conn() can process a to-client packet after the\ncurrent client call on the channel has already been torn down. In that\ncase chan-\u003ecall is NULL, rxrpc_try_get_call() returns NULL and there is\nno reference to drop.\n\nThe client-side implicit-end error path does not account for that and\nunconditionally calls rxrpc_put_call(). This turns a protocol error\npath into a kernel crash instead of rejecting the packet.\n\nOnly drop the call reference if one was actually acquired. Keep the\nexisting protocol error handling unchanged."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nrxrpc: Solo liberar la referencia de llamada si se adquiri\u00f3 una\n\nrxrpc_input_packet_on_conn() puede procesar un paquete dirigido al cliente despu\u00e9s de que la llamada actual del cliente en el canal ya ha sido terminada. En ese caso, chan -\u003e call es NULL, rxrpc_try_get_call() devuelve NULL y no hay ninguna referencia que liberar.\n\nLa ruta de error de fin impl\u00edcito del lado del cliente no tiene en cuenta eso y llama incondicionalmente a rxrpc_put_call(). Esto convierte una ruta de error del protocolo en un fallo del kernel en lugar de rechazar el paquete.\n\nSolo liberar la referencia de llamada si se adquiri\u00f3 una realmente. Mantener el manejo de errores del protocolo existente sin cambios."
}
],
"id": "CVE-2026-31638",
"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-2026-31638",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:11:27.061889Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-04-24T15:16:43.127",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/0c156aff8a2d4fa0d61db7837641975cf0e5452d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/6331f1b24a3e85465f6454e003a3e6c22005a5c5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/8299ca146489664e3c0c90a3b8900d8335b1ede4"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/9fb09861e2b8d1abfe2efaf260c9f1d30080ea38"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/b8f66447448d6c305a51413a67ec8ed26aa7d1dd"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-07T04:19:30+00:00",
"cve": "CVE-2026-31638",
"id": "CVE-2026-31638",
"initial_release_date": "2026-04-24T00:00:00+00:00",
"product_status:known_affected": "110",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: rxrpc: Only put the call ref if one was acquired",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31638.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-31638",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:11:27.061889Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-476",
"description": "CWE-476 NULL Pointer Dereference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-16T15:11:27.792Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/rxrpc/io_thread.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "b8f66447448d6c305a51413a67ec8ed26aa7d1dd",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
},
{
"lessThan": "0c156aff8a2d4fa0d61db7837641975cf0e5452d",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
},
{
"lessThan": "8299ca146489664e3c0c90a3b8900d8335b1ede4",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
},
{
"lessThan": "9fb09861e2b8d1abfe2efaf260c9f1d30080ea38",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
},
{
"lessThan": "6331f1b24a3e85465f6454e003a3e6c22005a5c5",
"status": "affected",
"version": "5e6ef4f1017c7f844e305283bbd8875af475e2fc",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/rxrpc/io_thread.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.2"
},
{
"lessThan": "6.2",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.135",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.82",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.23",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.135",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.82",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.23",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.13",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "6.2",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Only put the call ref if one was acquired\n\nrxrpc_input_packet_on_conn() can process a to-client packet after the\ncurrent client call on the channel has already been torn down. In that\ncase chan-\u003ecall is NULL, rxrpc_try_get_call() returns NULL and there is\nno reference to drop.\n\nThe client-side implicit-end error path does not account for that and\nunconditionally calls rxrpc_put_call(). This turns a protocol error\npath into a kernel crash instead of rejecting the packet.\n\nOnly drop the call reference if one was actually acquired. Keep the\nexisting protocol error handling unchanged."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - RXRPC runs over UDP and the vulnerable path is reached by received to-client RXRPC packets processed by the kernel RXRPC I/O thread. A malicious remote RXRPC peer can send the crafted packet after a client call has been torn down.\nAC:L - The attacker-controlled peer can observe the connection/call values during the normal exchange and choose when to send a packet with a higher callNumber after teardown. No hard-to-win race or external condition is required.\nPR:N - The packet receive path does not require the attacker to have local credentials or kernel capabilities. Any remote peer able to send matching RXRPC packets for an extant client connection can reach the vulnerable logic.\nUI:N - Once the victim system has an RXRPC client connection, exploitation is triggered by network packets alone. No interactive victim action is needed at the point of exploitation.\nS:U - The impact is within the same kernel security authority. This is not a VM escape, IOMMU bypass, or cross-scope sandbox boundary violation.\nC:N - The bug is an unconditional rxrpc_put_call(NULL), producing a NULL pointer dereference rather than a controllable read primitive. No information disclosure is apparent from the fault.\nI:N - The defect does not corrupt attacker-controlled memory or provide a write primitive. It is a protocol error path converted into a NULL dereference crash.\nA:H - Dereferencing the NULL call pointer in rxrpc_put_call() can oops or panic the kernel. A remote peer can repeat the trigger against vulnerable clients, causing high availability impact."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:24:03.234Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b8f66447448d6c305a51413a67ec8ed26aa7d1dd"
},
{
"url": "https://git.kernel.org/stable/c/0c156aff8a2d4fa0d61db7837641975cf0e5452d"
},
{
"url": "https://git.kernel.org/stable/c/8299ca146489664e3c0c90a3b8900d8335b1ede4"
},
{
"url": "https://git.kernel.org/stable/c/9fb09861e2b8d1abfe2efaf260c9f1d30080ea38"
},
{
"url": "https://git.kernel.org/stable/c/6331f1b24a3e85465f6454e003a3e6c22005a5c5"
}
],
"title": "rxrpc: Only put the call ref if one was acquired",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-31638",
"datePublished": "2026-04-24T14:44:52.122Z",
"dateReserved": "2026-03-09T15:48:24.125Z",
"dateUpdated": "2026-10-19T18:56:01.209Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
Loading timeline…
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.