{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23103", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.966Z", "datePublished": "2026-02-04T16:08:24.771Z", "dateUpdated": "2026-08-05T12:20:16.355Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:16.355Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvlan: Make the addrs_lock be per port\n\nMake the addrs_lock be per port, not per ipvlan dev.\n\nInitial code seems to be written in the assumption,\nthat any address change must occur under RTNL.\nBut it is not so for the case of IPv6. So\n\n1) Introduce per-port addrs_lock.\n\n2) It was needed to fix places where it was forgotten\nto take lock (ipvlan_open/ipvlan_close)\n\nThis appears to be a very minor problem though.\nSince it's highly unlikely that ipvlan_add_addr() will\nbe called on 2 CPU simultaneously. But nevertheless,\nthis could cause:\n\n1) False-negative of ipvlan_addr_busy(): one interface\niterated through all port->ipvlans + ipvlan->addrs\nunder some ipvlan spinlock, and another added IP\nunder its own lock. Though this is only possible\nfor IPv6, since looks like only ipvlan_addr6_event() can be\ncalled without rtnl_lock.\n\n2) Race since ipvlan_ht_addr_add(port) is called under\ndifferent ipvlan->addrs_lock locks\n\nThis should not affect performance, since add/remove IP\nis a rare situation and spinlock is not taken on fast\npaths." } ], "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 - Creating and managing ipvlan devices requires local access via netlink/rtnetlink syscalls. This is not remotely reachable.\nAC:L - The attacker controls both sides of the race by creating multiple ipvlan devices on the same port and triggering concurrent open/address-change operations. The race is reliably reproducible with retries.\nPR:L - ipvlan creation requires CAP_NET_ADMIN, which is obtainable via user namespaces (unshare -Urn) on a veth device. The ns_capable check on the physical device's user_ns is satisfied when both are in the user's namespace.\nUI:N - No user interaction is needed. The attacker can create ipvlan devices and trigger the race entirely on their own.\nS:U - This is a standard kernel privilege escalation vulnerability with no security boundary crossing (no VM escape, no IOMMU bypass).\nC:H - The race leads to a use-after-free in the per-port hash table used on the packet data path. The dangling pointer allows reading freed/reallocated memory contents during hash table lookups.\nI:H - The UAF in the hash table allows an attacker to reallocate the freed ipvl_addr structure with controlled data, enabling heap spraying and potential code execution through corrupted hash table entries.\nA:H - The dangling pointer in the hash table will cause a kernel crash when the freed memory is accessed during packet processing, leading to a kernel oops or panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ipvlan/ipvlan.h", "drivers/net/ipvlan/ipvlan_core.c", "drivers/net/ipvlan/ipvlan_main.c" ], "versions": [ { "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "3c149b662cbb202a450e81f938e702ba333864ad", "status": "affected", "versionType": "git" }, { "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "70feb16e3fbfb10b15de1396557c38e99f1ab8df", "status": "affected", "versionType": "git" }, { "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "88f83e6c9cdb46b8c8ddd0ba01393362963cf589", "status": "affected", "versionType": "git" }, { "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "04ba6de6eff61238e5397c14ac26a6578c7735a5", "status": "affected", "versionType": "git" }, { "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "1f300c10d92c547c3a7d978e1212ff52f18256ed", "status": "affected", "versionType": "git" }, { "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "6a81e2db096913d7e43aada1c350c1282e76db39", "status": "affected", "versionType": "git" }, { "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "d3ba32162488283c0a4c5bedd8817aec91748802", "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/ipvlan/ipvlan.h", "drivers/net/ipvlan/ipvlan_core.c", "drivers/net/ipvlan/ipvlan_main.c" ], "versions": [ { "version": "4.17", "status": "affected" }, { "version": "0", "lessThan": "4.17", "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": "6.12.68", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.8", "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": "4.17", "versionEndExcluding": "5.10.249" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.15.199" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.1.162" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.6.122" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.12.68" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.18.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3c149b662cbb202a450e81f938e702ba333864ad" }, { "url": "https://git.kernel.org/stable/c/70feb16e3fbfb10b15de1396557c38e99f1ab8df" }, { "url": "https://git.kernel.org/stable/c/88f83e6c9cdb46b8c8ddd0ba01393362963cf589" }, { "url": "https://git.kernel.org/stable/c/04ba6de6eff61238e5397c14ac26a6578c7735a5" }, { "url": "https://git.kernel.org/stable/c/1f300c10d92c547c3a7d978e1212ff52f18256ed" }, { "url": "https://git.kernel.org/stable/c/6a81e2db096913d7e43aada1c350c1282e76db39" }, { "url": "https://git.kernel.org/stable/c/d3ba32162488283c0a4c5bedd8817aec91748802" } ], "title": "ipvlan: Make the addrs_lock be per port", "x_generator": { "engine": "bippy-1.2.0" } }, 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