CVE-2025-21891

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net/ipv6/addrconf_core.c:47\n ipv6_addr_type include/net/ipv6.h:555 [inline]\n ip6_route_output_flags_noref net/ipv6/route.c:2616 [inline]\n ip6_route_output_flags+0x51/0x720 net/ipv6/route.c:2651\n ip6_route_output include/net/ip6_route.h:93 [inline]\n ipvlan_route_v6_outbound+0x24e/0x520 drivers/net/ipvlan/ipvlan_core.c:476\n ipvlan_process_v6_outbound drivers/net/ipvlan/ipvlan_core.c:491 [inline]\n ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:541 [inline]\n ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:605 [inline]\n ipvlan_queue_xmit+0xd72/0x1780 drivers/net/ipvlan/ipvlan_core.c:671\n ipvlan_start_xmit+0x5b/0x210 drivers/net/ipvlan/ipvlan_main.c:223\n __netdev_start_xmit include/linux/netdevice.h:5150 [inline]\n netdev_start_xmit include/linux/netdevice.h:5159 [inline]\n xmit_one net/core/dev.c:3735 [inline]\n dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3751\n sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343\n qdisc_restart net/sched/sch_generic.c:408 [inline]\n __qdisc_run+0x14da/0x35d0 net/sched/sch_generic.c:416\n qdisc_run+0x141/0x4d0 include/net/pkt_sched.h:127\n net_tx_action+0x78b/0x940 net/core/dev.c:5484\n handle_softirqs+0x1a0/0x7c0 kernel/softirq.c:561\n __do_softirq+0x14/0x1a kernel/softirq.c:595\n do_softirq+0x9a/0x100 kernel/softirq.c:462\n __local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:389\n local_bh_enable include/linux/bottom_half.h:33 [inline]\n rcu_read_unlock_bh include/linux/rcupdate.h:919 [inline]\n __dev_queue_xmit+0x2758/0x57d0 net/core/dev.c:4611\n dev_queue_xmit include/linux/netdevice.h:3311 [inline]\n packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276\n packet_snd net/packet/af_packet.c:3132 [inline]\n packet_sendmsg+0x93e0/0xa7e0 net/packet/af_packet.c:3164\n sock_sendmsg_nosec net/socket.c:718 [inline]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": 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"https://git.kernel.org/stable/c/27843ce6ba3d3122b65066550fe33fb8839f8aef"}], "title": "ipvlan: ensure network headers are in skb linear part", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-21891", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-10-01T19:25:21.205802Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-908", "description": "CWE-908 Use of Uninitialized Resource"}]}], "title": "CISA ADP 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[{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "452BF9DD-AB6D-4B9B-995C-B24605818692", "versionEndExcluding": "6.1.130", "versionStartIncluding": "3.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8C92C9CD-2ADE-412E-A7FF-DC9E0630B25D", "versionEndExcluding": "6.6.81", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "3D5C8D9A-4013-4C1A-810F-AA540BB5737C", "versionEndExcluding": "6.12.18", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "64F12D9B-71C2-4CD7-A288-0D5EF1709620", "versionEndExcluding": "6.13.6", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*", "matchCriteriaId": "186716B6-2B66-4BD0-852E-D48E71C0C85F", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D3E781C-403A-498F-9DA9-ECEE50F41E75", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*", "matchCriteriaId": "66619FB8-0AAF-4166-B2CF-67B24143261D", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*", "matchCriteriaId": "D3D6550E-6679-4560-902D-AF52DCFE905B", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvlan: ensure network headers are in skb linear part\n\nsyzbot found that ipvlan_process_v6_outbound() was assuming\nthe IPv6 network header isis present in skb->head [1]\n\nAdd the needed pskb_network_may_pull() calls for both\nIPv4 and IPv6 handlers.\n\n[1]\nBUG: KMSAN: uninit-value in __ipv6_addr_type+0xa2/0x490 net/ipv6/addrconf_core.c:47\n __ipv6_addr_type+0xa2/0x490 net/ipv6/addrconf_core.c:47\n ipv6_addr_type include/net/ipv6.h:555 [inline]\n ip6_route_output_flags_noref net/ipv6/route.c:2616 [inline]\n ip6_route_output_flags+0x51/0x720 net/ipv6/route.c:2651\n ip6_route_output include/net/ip6_route.h:93 [inline]\n ipvlan_route_v6_outbound+0x24e/0x520 drivers/net/ipvlan/ipvlan_core.c:476\n ipvlan_process_v6_outbound drivers/net/ipvlan/ipvlan_core.c:491 [inline]\n ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:541 [inline]\n ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:605 [inline]\n ipvlan_queue_xmit+0xd72/0x1780 drivers/net/ipvlan/ipvlan_core.c:671\n ipvlan_start_xmit+0x5b/0x210 drivers/net/ipvlan/ipvlan_main.c:223\n __netdev_start_xmit include/linux/netdevice.h:5150 [inline]\n netdev_start_xmit include/linux/netdevice.h:5159 [inline]\n xmit_one net/core/dev.c:3735 [inline]\n dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3751\n sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343\n qdisc_restart net/sched/sch_generic.c:408 [inline]\n __qdisc_run+0x14da/0x35d0 net/sched/sch_generic.c:416\n qdisc_run+0x141/0x4d0 include/net/pkt_sched.h:127\n net_tx_action+0x78b/0x940 net/core/dev.c:5484\n handle_softirqs+0x1a0/0x7c0 kernel/softirq.c:561\n __do_softirq+0x14/0x1a kernel/softirq.c:595\n do_softirq+0x9a/0x100 kernel/softirq.c:462\n __local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:389\n local_bh_enable include/linux/bottom_half.h:33 [inline]\n rcu_read_unlock_bh include/linux/rcupdate.h:919 [inline]\n __dev_queue_xmit+0x2758/0x57d0 net/core/dev.c:4611\n dev_queue_xmit include/linux/netdevice.h:3311 [inline]\n packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276\n packet_snd net/packet/af_packet.c:3132 [inline]\n packet_sendmsg+0x93e0/0xa7e0 net/packet/af_packet.c:3164\n sock_sendmsg_nosec net/socket.c:718 [inline]"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipvlan: garantizar que los encabezados de red est\u00e9n en la parte lineal de skb syzbot encontr\u00f3 que ipvlan_process_v6_outbound() asum\u00eda que el encabezado de red IPv6 est\u00e1 presente en skb->head [1] Agregue las llamadas pskb_network_may_pull() necesarias para los controladores IPv4 e IPv6. [1] ERROR: KMSAN: uninit-value in __ipv6_addr_type+0xa2/0x490 net/ipv6/addrconf_core.c:47 __ipv6_addr_type+0xa2/0x490 net/ipv6/addrconf_core.c:47 ipv6_addr_type include/net/ipv6.h:555 [inline] ip6_route_output_flags_noref net/ipv6/route.c:2616 [inline] ip6_route_output_flags+0x51/0x720 net/ipv6/route.c:2651 ip6_route_output include/net/ip6_route.h:93 [inline] ipvlan_route_v6_outbound+0x24e/0x520 drivers/net/ipvlan/ipvlan_core.c:476 ipvlan_process_v6_outbound drivers/net/ipvlan/ipvlan_core.c:491 [inline] ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:541 [inline] ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:605 [inline] ipvlan_queue_xmit+0xd72/0x1780 drivers/net/ipvlan/ipvlan_core.c:671 ipvlan_start_xmit+0x5b/0x210 drivers/net/ipvlan/ipvlan_main.c:223 __netdev_start_xmit include/linux/netdevice.h:5150 [inline] netdev_start_xmit include/linux/netdevice.h:5159 [inline] xmit_one net/core/dev.c:3735 [inline] dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3751 sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343 qdisc_restart net/sched/sch_generic.c:408 [inline] __qdisc_run+0x14da/0x35d0 net/sched/sch_generic.c:416 qdisc_run+0x141/0x4d0 include/net/pkt_sched.h:127 net_tx_action+0x78b/0x940 net/core/dev.c:5484 handle_softirqs+0x1a0/0x7c0 kernel/softirq.c:561 __do_softirq+0x14/0x1a kernel/softirq.c:595 do_softirq+0x9a/0x100 kernel/softirq.c:462 __local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:389 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:919 [inline] __dev_queue_xmit+0x2758/0x57d0 net/core/dev.c:4611 dev_queue_xmit include/linux/netdevice.h:3311 [inline] packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3132 [inline] packet_sendmsg+0x93e0/0xa7e0 net/packet/af_packet.c:3164 sock_sendmsg_nosec net/socket.c:718 [inline] "}], "id": "CVE-2025-21891", "lastModified": "2026-06-17T08:44:32.520", "metrics": {"cvssMetricV31": [{"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"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-21891", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T19:25:21.205802Z", "version": "2.0.3"}}]}, "published": "2025-03-27T15:15:57.027", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/27843ce6ba3d3122b65066550fe33fb8839f8aef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4ec48f812804f370f622e0874e6dd8fcc58241cd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5353fd89663c48f56bdff975c562cfe78b1a2e4c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5b8dea8d1612dc7151d2457d7d2e6a69820309bf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e2a4f76a2d8a44816ecd25bcbdb47b786d621974"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-908"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: ipvlan: ensure network headers are in skb linear part", "id": "2355408", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2355408"}, "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-908", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nipvlan: ensure network headers are in skb linear part\nsyzbot found that ipvlan_process_v6_outbound() was assuming\nthe IPv6 network header isis present in skb->head [1]\nAdd the needed pskb_network_may_pull() calls for both\nIPv4 and IPv6 handlers.\n[1]\nBUG: KMSAN: uninit-value in __ipv6_addr_type+0xa2/0x490 net/ipv6/addrconf_core.c:47\n__ipv6_addr_type+0xa2/0x490 net/ipv6/addrconf_core.c:47\nipv6_addr_type include/net/ipv6.h:555 [inline]\nip6_route_output_flags_noref net/ipv6/route.c:2616 [inline]\nip6_route_output_flags+0x51/0x720 net/ipv6/route.c:2651\nip6_route_output include/net/ip6_route.h:93 [inline]\nipvlan_route_v6_outbound+0x24e/0x520 drivers/net/ipvlan/ipvlan_core.c:476\nipvlan_process_v6_outbound drivers/net/ipvlan/ipvlan_core.c:491 [inline]\nipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:541 [inline]\nipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:605 [inline]\nipvlan_queue_xmit+0xd72/0x1780 drivers/net/ipvlan/ipvlan_core.c:671\nipvlan_start_xmit+0x5b/0x210 drivers/net/ipvlan/ipvlan_main.c:223\n__netdev_start_xmit include/linux/netdevice.h:5150 [inline]\nnetdev_start_xmit include/linux/netdevice.h:5159 [inline]\nxmit_one net/core/dev.c:3735 [inline]\ndev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3751\nsch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343\nqdisc_restart net/sched/sch_generic.c:408 [inline]\n__qdisc_run+0x14da/0x35d0 net/sched/sch_generic.c:416\nqdisc_run+0x141/0x4d0 include/net/pkt_sched.h:127\nnet_tx_action+0x78b/0x940 net/core/dev.c:5484\nhandle_softirqs+0x1a0/0x7c0 kernel/softirq.c:561\n__do_softirq+0x14/0x1a kernel/softirq.c:595\ndo_softirq+0x9a/0x100 kernel/softirq.c:462\n__local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:389\nlocal_bh_enable include/linux/bottom_half.h:33 [inline]\nrcu_read_unlock_bh include/linux/rcupdate.h:919 [inline]\n__dev_queue_xmit+0x2758/0x57d0 net/core/dev.c:4611\ndev_queue_xmit include/linux/netdevice.h:3311 [inline]\npacket_xmit+0x9c/0x6c0 net/packet/af_packet.c:276\npacket_snd net/packet/af_packet.c:3132 [inline]\npacket_sendmsg+0x93e0/0xa7e0 net/packet/af_packet.c:3164\nsock_sendmsg_nosec net/socket.c:718 [inline]"], "name": "CVE-2025-21891", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "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": "2025-03-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21891\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21891\nhttps://lore.kernel.org/linux-cve-announce/2025032715-CVE-2025-21891-8717@gregkh/T"], "threat_severity": "Moderate"}

{}