CVE-2026-23103

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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": 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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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "3c149b662cbb202a450e81f938e702ba333864ad", "versionType": "git"}, {"status": "affected", "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "70feb16e3fbfb10b15de1396557c38e99f1ab8df", "versionType": "git"}, {"status": "affected", "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "88f83e6c9cdb46b8c8ddd0ba01393362963cf589", "versionType": "git"}, {"status": "affected", "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "04ba6de6eff61238e5397c14ac26a6578c7735a5", "versionType": "git"}, {"status": "affected", "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "1f300c10d92c547c3a7d978e1212ff52f18256ed", "versionType": "git"}, {"status": "affected", "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "6a81e2db096913d7e43aada1c350c1282e76db39", "versionType": "git"}, {"status": "affected", "version": "8230819494b3bf284ca7262ac5f877333147b937", "lessThan": "d3ba32162488283c0a4c5bedd8817aec91748802", "versionType": "git"}], "programFiles": ["drivers/net/ipvlan/ipvlan.h", "drivers/net/ipvlan/ipvlan_core.c", "drivers/net/ipvlan/ipvlan_main.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.17"}, {"status": "unaffected", "version": "0", "lessThan": "4.17", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.249", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.199", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.162", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.122", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.68", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.8", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/ipvlan/ipvlan.h", "drivers/net/ipvlan/ipvlan_core.c", "drivers/net/ipvlan/ipvlan_main.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.249", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.199", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.162", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.122", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.68", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.8", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19", "versionStartIncluding": "4.17"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:16.355Z"}}}, "cveMetadata": {"cveId": "CVE-2026-23103", "state": "PUBLISHED", "dateUpdated": "2026-11-10T12:41:45.636Z", "dateReserved": "2026-01-13T15:37:45.966Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-02-04T16:08:24.771Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nipvlan: Hacer que el addrs_lock sea por puerto\n\nHacer que el addrs_lock sea por puerto, no por dispositivo ipvlan.\n\nEl c\u00f3digo inicial parece estar escrito bajo la suposici\u00f3n de que cualquier cambio de direcci\u00f3n debe ocurrir bajo RTNL. Pero no es as\u00ed para el caso de IPv6. As\u00ed que\n\n1) Introducir addrs_lock por puerto.\n\n2) Fue necesario corregir lugares donde se olvid\u00f3 tomar el bloqueo (ipvlan_open/ipvlan_close)\n\nEsto parece ser un problema muy menor, sin embargo. Ya que es muy poco probable que ipvlan_add_addr() sea llamado en 2 CPU simult\u00e1neamente. Pero, sin embargo, esto podr\u00eda causar:\n\n1) Falso negativo de ipvlan_addr_busy(): una interfaz iter\u00f3 a trav\u00e9s de todos los port->ipvlans + ipvlan->addrs bajo alg\u00fan spinlock de ipvlan, y otra a\u00f1adi\u00f3 IP bajo su propio bloqueo. Aunque esto solo es posible para IPv6, ya que parece que solo ipvlan_addr6_event() puede ser llamado sin rtnl_lock.\n\n2) Condici\u00f3n de carrera ya que ipvlan_ht_addr_add(port) es llamado bajo diferentes bloqueos ipvlan->addrs_lock.\n\nEsto no deber\u00eda afectar el rendimiento, ya que a\u00f1adir/eliminar IP es una situaci\u00f3n rara y el spinlock no se toma en rutas r\u00e1pidas."}], "id": "CVE-2026-23103", "lastModified": "2026-11-10T13:18:35.187", "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": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23103", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-16T20:21:03.730200Z", "version": "2.0.3"}}]}, "published": "2026-02-04T17:16:21.177", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/04ba6de6eff61238e5397c14ac26a6578c7735a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f300c10d92c547c3a7d978e1212ff52f18256ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3c149b662cbb202a450e81f938e702ba333864ad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6a81e2db096913d7e43aada1c350c1282e76db39"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/70feb16e3fbfb10b15de1396557c38e99f1ab8df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/88f83e6c9cdb46b8c8ddd0ba01393362963cf589"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d3ba32162488283c0a4c5bedd8817aec91748802"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: ipvlan: Make the addrs_lock be per port", "id": "2436771", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436771"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-23103", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-02-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23103\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23103\nhttps://lore.kernel.org/linux-cve-announce/2026020429-CVE-2026-23103-63b3@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2026-04-16T01:15:20.523716+00:00", "updated": "2026-10-19T20:45:03.511278+00:00", "vendors": []}