{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-3609", "assignerOrgId": "14ed7db2-1595-443d-9d34-6215bf890778", "state": "PUBLISHED", "assignerShortName": "Google", "dateReserved": "2023-07-10T20:52:53.660Z", "datePublished": "2023-07-21T20:47:12.172Z", "dateUpdated": "2026-07-30T16:34:52.372Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "14ed7db2-1595-443d-9d34-6215bf890778", "shortName": "Google", "dateUpdated": "2026-07-30T16:34:52.372Z" }, "title": "Use-after-free in Linux kernel's net/sched: cls_u32 component", "datePublic": "2023-06-09T10:40:00.000Z", "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-416", "description": "CWE-416 Use After Free", "type": "CWE" } ] } ], "impacts": [ { "capecId": "CAPEC-233", "descriptions": [ { "lang": "en", "value": "CAPEC-233 Privilege Escalation" } ] } ], "affected": [ { "vendor": "Linux", "product": "Kernel", "platforms": [ "Linux" ], "packageName": "kernel", "repo": "https://git.kernel.org", "versions": [ { "status": "affected", "version": "4.14.0", "lessThan": "4.14.322", "versionType": "semver" }, { "status": "affected", "version": "4.15.0", "lessThan": "4.19.291", "versionType": "semver" }, { "status": "affected", "version": "4.20.0", "lessThan": "5.4.248", "versionType": "semver" }, { "status": "affected", "version": "5.5.0", "lessThan": "5.10.185", "versionType": "semver" }, { "status": "affected", "version": "5.11.0", "lessThan": "5.15.118", "versionType": "semver" }, { "status": "affected", "version": "5.16.0", "lessThan": "6.1.35", "versionType": "semver" }, { "status": "affected", "version": "6.2.0", "lessThan": "6.3.9", "versionType": "semver" }, { "status": "unaffected", "version": "6.4.0", "versionType": "semver" }, { "status": "unaffected", "version": "04c55383fa5689357bcdd2c8036725a55ed632bc", "versionType": "git" } ], "defaultStatus": "unaffected", "cpes": [ "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*" ] } ], "descriptions": [ { "lang": "en", "value": "A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.\n\n\n\nIf tcf_change_indev() fails, u32_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability.\n\n\n\nWe recommend upgrading past commit 04c55383fa5689357bcdd2c8036725a55ed632bc.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "

A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.

If tcf_change_indev() fails, u32_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability.

We recommend upgrading past commit 04c55383fa5689357bcdd2c8036725a55ed632bc.

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