CVE-2026-31474

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Move the kfree() of this potentially extended tx.buf to\nsk_destruct time when either isotp_sendmsg() and isotp_release() are done."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable ISO-TP transmit path is reached through local socket syscalls such as socket/bind/sendmsg/close on an AF_CAN CAN_ISOTP socket. A CAN peer may influence flow control, but the bug requires a local process to create the socket, send the PDU, and interrupt close.\nAC:L - Once ISO-TP extended PDU buffers are available, the attacker controls the socket options, message size, close operation, and signal timing needed to hit the close-vs-transmit race. The race is between attacker-controlled local operations and in-kernel asynchronous transmit completion, so no uncontrollable external condition is required.\nPR:L - The AF_CAN CAN_ISOTP socket create, bind, setsockopt, sendmsg, and release paths do not impose a CAP_NET_ADMIN check. An unprivileged local user can reach the vulnerable code on a system with an available CAN interface or equivalent namespace/preconfigured CAN setup.\nUI:N - No victim action is needed once the attacker can run local code. The attacker can drive the send, close, and signal sequence directly.\nS:U - The issue is a kernel memory lifetime bug in the same operating-system security authority. It does not cross a VM, IOMMU, or separate sandbox boundary by itself.\nC:H - The freed tx.buf can be reused while the ISO-TP transmit path later reads from it into outgoing CAN frames, creating a kernel heap use-after-free information disclosure primitive. Under conservative kernel UAF scoring, this supports high confidentiality impact.\nI:H - This is kernel heap use-after-free memory corruption reachable by attacker-controlled timing and heap grooming. Following the required conservative UAF guidance, it is treated as potentially exploitable for high integrity impact.\nA:H - The stale freed buffer can be dereferenced asynchronously during frame construction after release, which can trigger kernel memory corruption symptoms including oops or panic. Repeated local triggering can therefore cause high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/can/isotp.c"], "versions": [{"version": "96d1c81e6a0478535342dff6c730adb076cd84e8", "lessThan": "cb3d6efa78460e6d50bf68806d0db66265709f64", "status": "affected", "versionType": "git"}, {"version": "96d1c81e6a0478535342dff6c730adb076cd84e8", "lessThan": "9649d051e54413049c009638ec1dc23962c884a4", "status": "affected", "versionType": "git"}, {"version": "96d1c81e6a0478535342dff6c730adb076cd84e8", "lessThan": "eec8a1b18a79600bd4419079dc0026c1db72a830", "status": "affected", "versionType": "git"}, {"version": "96d1c81e6a0478535342dff6c730adb076cd84e8", "lessThan": "2e62e7051eca75a7f2e3d52d62ec10d7d7aa358c", "status": "affected", "versionType": "git"}, {"version": "96d1c81e6a0478535342dff6c730adb076cd84e8", "lessThan": "424e95d62110cdbc8fd12b40918f37e408e35a92", "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/can/isotp.c"], "versions": [{"version": "6.4", "status": "affected"}, {"version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": 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"https://git.kernel.org/stable/c/eec8a1b18a79600bd4419079dc0026c1db72a830"}, {"url": "https://git.kernel.org/stable/c/2e62e7051eca75a7f2e3d52d62ec10d7d7aa358c"}, {"url": "https://git.kernel.org/stable/c/424e95d62110cdbc8fd12b40918f37e408e35a92"}], "title": "can: isotp: fix tx.buf use-after-free in isotp_sendmsg()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"affected": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:10.2"], "defaultStatus": "affected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 10", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "0:6.12.0-211.26.1.el10_2", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux_eus:10.0"], "defaultStatus": "affected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 10.0 Extended Update Support", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "0:6.12.0-55.82.1.el10_0", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:enterprise_linux:9", "cpe:/o:redhat:enterprise_linux:9"], "defaultStatus": "affected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "0:5.14.0-687.17.1.el9_8", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:6"], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 6", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:7"], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat 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Enterprise Linux 9", "vendor": "Red Hat"}], "datePublic": "2026-04-22T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "A flaw was found in the Linux kernel's Controller Area Network (CAN) ISO-TP (isotp) module. This vulnerability, known as a use-after-free, occurs when the system attempts to free a memory region while it is still being used. A local attacker could trigger this condition by sending a signal that interrupts a specific waiting process during a close operation. This can lead to memory corruption, potentially causing the system to crash (denial of service) or behave unpredictably."}], "metrics": [{"other": {"content": {"namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "format": "CVSS"}], "problemTypes": [{"descriptions": [{"cweId": "CWE-364", "description": "Signal Handler Race Condition", "lang": "en", "type": "CWE"}]}], "references": [{"tags": ["vdb-entry", "x_refsource_REDHAT"], "url": "https://access.redhat.com/security/cve/CVE-2026-31474"}, {"name": "RHBZ#2460646", "tags": ["issue-tracking", "x_refsource_REDHAT"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460646"}, {"tags": ["x_sadp-csaf-vex"], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31474.json"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:27731"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:27288"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:27789"}], "solutions": [{"lang": "en", "value": "RHSA-2026:27731: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)"}, {"lang": "en", "value": "RHSA-2026:27288: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10)"}, {"lang": "en", "value": "RHSA-2026:27789: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9)"}], "timeline": [{"lang": "en", "time": "2026-04-22T00:00:00.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-04-22T00:00:00.000Z", "value": "Made public."}], "title": "kernel: can: isotp: fix tx.buf use-after-free in isotp_sendmsg()", "workarounds": [{"lang": "en", "value": "Systems which do not require it can blocklist the `can_isotp` module to prevent it from being loaded. See https://access.redhat.com/solutions/41278 for more information."}], "x_adpType": "supplier", "x_generator": {"engine": "sadp-cli 1.0.0"}, "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T01:09:14.681Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-31474", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:09:55.947236Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T18:35:50.370Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31474", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.098Z", "datePublished": "2026-04-22T13:54:03.100Z", "dateUpdated": "2026-10-16T15:20:12.522Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:22:52.871Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: isotp: fix tx.buf use-after-free in isotp_sendmsg()\n\nisotp_sendmsg() uses only cmpxchg() on so->tx.state to serialize access\nto so->tx.buf. isotp_release() waits for ISOTP_IDLE via\nwait_event_interruptible() and then calls kfree(so->tx.buf).\n\nIf a signal interrupts the wait_event_interruptible() inside close()\nwhile tx.state is ISOTP_SENDING, the loop exits early and release\nproceeds to force ISOTP_SHUTDOWN and continues to kfree(so->tx.buf)\nwhile sendmsg may still be reading so->tx.buf for the final CAN frame\nin isotp_fill_dataframe().\n\nThe so->tx.buf can be allocated once when the standard tx.buf length needs\nto be extended. Move the kfree() of this potentially extended tx.buf to\nsk_destruct time when either isotp_sendmsg() and isotp_release() are done."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable ISO-TP transmit path is reached through local socket syscalls such as socket/bind/sendmsg/close on an AF_CAN CAN_ISOTP socket. A CAN peer may influence flow control, but the bug requires a local process to create the socket, send the PDU, and interrupt close.\nAC:L - Once ISO-TP extended PDU buffers are available, the attacker controls the socket options, message size, close operation, and signal timing needed to hit the close-vs-transmit race. The race is between attacker-controlled local operations and in-kernel asynchronous transmit completion, so no uncontrollable external condition is required.\nPR:L - The AF_CAN CAN_ISOTP socket create, bind, setsockopt, sendmsg, and release paths do not impose a CAP_NET_ADMIN check. An unprivileged local user can reach the vulnerable code on a system with an available CAN interface or equivalent namespace/preconfigured CAN setup.\nUI:N - No victim action is needed once the attacker can run local code. The attacker can drive the send, close, and signal sequence directly.\nS:U - The issue is a kernel memory lifetime bug in the same operating-system security authority. It does not cross a VM, IOMMU, or separate sandbox boundary by itself.\nC:H - The freed tx.buf can be reused while the ISO-TP transmit path later reads from it into outgoing CAN frames, creating a kernel heap use-after-free information disclosure primitive. Under conservative kernel UAF scoring, this supports high confidentiality impact.\nI:H - This is kernel heap use-after-free memory corruption reachable by attacker-controlled timing and heap grooming. Following the required conservative UAF guidance, it is treated as potentially exploitable for high integrity impact.\nA:H - The stale freed buffer can be dereferenced asynchronously during frame construction after release, which can trigger kernel memory corruption symptoms including oops or panic. Repeated local triggering can therefore cause high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/can/isotp.c"], "versions": [{"version": "96d1c81e6a0478535342dff6c730adb076cd84e8", "lessThan": "cb3d6efa78460e6d50bf68806d0db66265709f64", "status": "affected", "versionType": "git"}, {"version": "96d1c81e6a0478535342dff6c730adb076cd84e8", "lessThan": "9649d051e54413049c009638ec1dc23962c884a4", "status": "affected", "versionType": "git"}, {"version": "96d1c81e6a0478535342dff6c730adb076cd84e8", "lessThan": "eec8a1b18a79600bd4419079dc0026c1db72a830", "status": "affected", "versionType": "git"}, {"version": "96d1c81e6a0478535342dff6c730adb076cd84e8", "lessThan": "2e62e7051eca75a7f2e3d52d62ec10d7d7aa358c", "status": "affected", "versionType": "git"}, {"version": "96d1c81e6a0478535342dff6c730adb076cd84e8", "lessThan": 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isotp_sendmsg()\n\nisotp_sendmsg() uses only cmpxchg() on so->tx.state to serialize access\nto so->tx.buf. isotp_release() waits for ISOTP_IDLE via\nwait_event_interruptible() and then calls kfree(so->tx.buf).\n\nIf a signal interrupts the wait_event_interruptible() inside close()\nwhile tx.state is ISOTP_SENDING, the loop exits early and release\nproceeds to force ISOTP_SHUTDOWN and continues to kfree(so->tx.buf)\nwhile sendmsg may still be reading so->tx.buf for the final CAN frame\nin isotp_fill_dataframe().\n\nThe so->tx.buf can be allocated once when the standard tx.buf length needs\nto be extended. Move the kfree() of this potentially extended tx.buf to\nsk_destruct time when either isotp_sendmsg() and isotp_release() are done."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncan: isotp: corregir el uso despu\u00e9s de liberaci\u00f3n de tx.buf en isotp_sendmsg()\n\nisotp_sendmsg() usa solo cmpxchg() en so -> tx.state para serializar el acceso a so -> tx.buf. isotp_release() espera por ISOTP_IDLE a trav\u00e9s de wait_event_interruptible() y luego llama a kfree(so -> tx.buf).\n\nSi una se\u00f1al interrumpe wait_event_interruptible() dentro de close() mientras tx.state es ISOTP_SENDING, el bucle sale prematuramente y la liberaci\u00f3n procede a forzar ISOTP_SHUTDOWN y contin\u00faa con kfree(so -> tx.buf) mientras sendmsg a\u00fan puede estar leyendo so -> tx.buf para el frame CAN final en isotp_fill_dataframe().\n\nEl so -> tx.buf puede ser asignado una vez cuando la longitud est\u00e1ndar de tx.buf necesita ser extendida. Mover el kfree() de este tx.buf potencialmente extendido al momento de sk_destruct cuando isotp_sendmsg() e isotp_release() hayan terminado."}], "id": "CVE-2026-31474", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31474", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:09:55.947236Z", "version": "2.0.3"}}]}, "published": "2026-04-22T14:16:44.053", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2e62e7051eca75a7f2e3d52d62ec10d7d7aa358c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/424e95d62110cdbc8fd12b40918f37e408e35a92"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9649d051e54413049c009638ec1dc23962c884a4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cb3d6efa78460e6d50bf68806d0db66265709f64"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eec8a1b18a79600bd4419079dc0026c1db72a830"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:27288"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:27731"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:27789"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-31474"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460646"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31474.json"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-364"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: can: isotp: fix tx.buf use-after-free in isotp_sendmsg()", "id": "2460646", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460646"}, "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-364", "details": ["A flaw was found in the Linux kernel's Controller Area Network (CAN) ISO-TP (isotp) module. This vulnerability, known as a use-after-free, occurs when the system attempts to free a memory region while it is still being used. A local attacker could trigger this condition by sending a signal that interrupts a specific waiting process during a close operation. This can lead to memory corruption, potentially causing the system to crash (denial of service) or behave unpredictably."], "name": "CVE-2026-31474", "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": "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"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31474\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31474\nhttps://lore.kernel.org/linux-cve-announce/2026042256-CVE-2026-31474-8673@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[96d1c81e6a0478535342dff6c730adb076cd84e8,cb3d6efa78460e6d50bf68806d0db66265709f64)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[96d1c81e6a0478535342dff6c730adb076cd84e8,9649d051e54413049c009638ec1dc23962c884a4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[96d1c81e6a0478535342dff6c730adb076cd84e8,eec8a1b18a79600bd4419079dc0026c1db72a830)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[96d1c81e6a0478535342dff6c730adb076cd84e8,2e62e7051eca75a7f2e3d52d62ec10d7d7aa358c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[96d1c81e6a0478535342dff6c730adb076cd84e8,424e95d62110cdbc8fd12b40918f37e408e35a92)"}}], "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": "6.4"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.4)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.131,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.80,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.21,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.11,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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"}], "analysis": {"en": {"generated_at": "2026-04-28T15:40:00.957423+00:00", "value": {"mitigation_remediation": ["Upgrade the Linux kernel to a version that includes the patch for the ISO\u2011TP sendmsg use\u2011after\u2011free bug", "Reboot the system after upgrading to ensure the new kernel is running", "If an immediate upgrade is not possible, consider disabling the ISO\u2011TP functionality in the CAN network stack or isolating CAN devices until a patched kernel is available"], "summary": {"action": "Patch Now", "impact": "Use\u2011After\u2011Free in Linux CAN ISO\u2011TP driver"}, "threat_synthesis": {"affected_systems": "All Linux kernel installations that include the problematic CAN ISO\u2011TP driver are potentially vulnerable; the CVE does not specify particular kernel releases, and the list of affected versions is not provided in the vendor data.", "description_and_impact": "The CVE involves a use\u2011after\u2011free flaw in the Linux kernel's CAN ISO\u2011TP driver (CWE\u2011416) coupled with a race condition (CWE\u2011364). When a close operation is interrupted by a signal while a transmission is in progress, the driver may free the transmission buffer before the sending routine has finished using it. This can lead to kernel memory corruption, a crash, or denial of service.", "risk_and_exploitability": "The CVSS base score is 7.8, indicating high severity. The EPSS score is <1%, showing a low likelihood of exploitation. Attackers would need to trigger a close operation with an interrupting signal while a transmission is underway, a scenario that is difficult to accomplish from a remote context but possible from a local or privileged environment. Since no public exploits exist, the risk is primarily the potential for a kernel crash or memory corruption that could be exploited to gain higher privileges or disrupt system availability. The flaw is not listed in CISA\u2019s KEV catalog, and the attack vector is confined to local or remote code execution that affects the CAN network stack."}}}}, "created": "2026-04-22T19:00:08.095909+00:00", "updated": "2026-04-28T15:45:06.380300+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}