{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23001", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.938Z", "datePublished": "2026-01-25T14:36:15.790Z", "dateUpdated": "2026-08-05T12:20:04.510Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:04.510Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacvlan: fix possible UAF in macvlan_forward_source()\n\nAdd RCU protection on (struct macvlan_source_entry)->vlan.\n\nWhenever macvlan_hash_del_source() is called, we must clear\nentry->vlan pointer before RCU grace period starts.\n\nThis allows macvlan_forward_source() to skip over\nentries queued for freeing.\n\nNote that macvlan_dev are already RCU protected, as they\nare embedded in a standard netdev (netdev_priv(ndev)).\n\nhttps: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u" } ], "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 reliable attacker-controlled path requires local rtnetlink manipulation of macvlan source-mode entries or failed macvlan creation, followed by local packet injection through a lower device such as veth/tun. Received frames reach the buggy RX handler, but creating the vulnerable stale source entry is a local operation.\nAC:L - The attacker can create the macvlan/source-entry state and trigger packet delivery repeatedly; the demonstrated stale-entry case is deterministic, and source-entry deletion races are attacker-controllable with concurrent netlink and packet activity.\nPR:L - The setup path requires CAP_NET_ADMIN for RTM_NEWLINK/RTM_SETLINK/RTM_DELLINK, but this is reachable by an unprivileged local user in a user-created user/net namespace on systems allowing user namespaces. It does not require real init-namespace root.\nUI:N - No victim action is required once the local attacker runs the netlink operations and injects matching frames. Exploitation is driven entirely by attacker-controlled local processes.\nS:U - The vulnerability corrupts or dereferences memory within the same kernel security authority. It is a standard kernel memory-safety issue, not a VM escape or cross-scope boundary violation.\nC:H - This is a use-after-free involving a freed macvlan/net_device-private object, and reclaimed heap contents can be exposed or used as attacker-shaped kernel pointers. Per kernel CVSS guidance, UAFs are scored as high confidentiality impact.\nI:H - The freed object is later used as a live macvlan_dev and passed into forwarding/statistics paths, giving plausible control-flow or write-primitive opportunities after heap reclaim. Per kernel CVSS guidance, UAF memory corruption is high integrity impact.\nA:H - Syzbot observed a KASAN slab-use-after-free in macvlan_forward_source(), and the bug can crash or panic the kernel. A kernel UAF reachable on demand is high availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/macvlan.c" ], "versions": [ { "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47", "lessThan": "8133e85b8a3ec9f10d861e0002ec6037256e987e", "status": "affected", "versionType": "git" }, { "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47", "lessThan": "484919832e2db6ce1e8add92c469e5d459a516b5", "status": "affected", "versionType": "git" }, { "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47", "lessThan": "232afc74a6dde0fe1830988e5827921f5ec9bb3f", "status": "affected", "versionType": "git" }, { "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47", "lessThan": "15f6faf36e162532bec5cc05eb3fc622108bf2ed", "status": "affected", "versionType": "git" }, { "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47", "lessThan": "8518712a2ca952d6da2238c6f0a16b4ae5ea3f13", "status": "affected", "versionType": "git" }, { "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47", "lessThan": "6dbead9c7677186f22b7981dd085a0feec1f038e", "status": "affected", "versionType": "git" }, { "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47", "lessThan": "7470a7a63dc162f07c26dbf960e41ee1e248d80e", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/macvlan.c" ], "versions": [ { "version": "3.18", "status": "affected" }, { "version": "0", "lessThan": "3.18", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.249", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.199", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.162", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.122", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.67", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.7", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19", "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": "3.18", "versionEndExcluding": "5.10.249" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.15.199" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.1.162" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.6.122" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.12.67" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.18.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8133e85b8a3ec9f10d861e0002ec6037256e987e" }, { "url": "https://git.kernel.org/stable/c/484919832e2db6ce1e8add92c469e5d459a516b5" }, { "url": "https://git.kernel.org/stable/c/232afc74a6dde0fe1830988e5827921f5ec9bb3f" }, { "url": "https://git.kernel.org/stable/c/15f6faf36e162532bec5cc05eb3fc622108bf2ed" }, { "url": "https://git.kernel.org/stable/c/8518712a2ca952d6da2238c6f0a16b4ae5ea3f13" }, { "url": "https://git.kernel.org/stable/c/6dbead9c7677186f22b7981dd085a0feec1f038e" }, { "url": "https://git.kernel.org/stable/c/7470a7a63dc162f07c26dbf960e41ee1e248d80e" } ], "title": "macvlan: fix possible UAF in macvlan_forward_source()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-06-16T20:17:12.456069Z", "id": "CVE-2026-23001", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-16T20:17:28.878Z" } } ] } }