--- id: CVE-2024-33621 title: |- In the Linux kernel, the following vulnerability has been resolved: ipvlan: Dont Use skb->sk in ipvlan_process_v{4,6}_outbound Raw packet from PF_PACKET socket ontop of an IPv6-backed ipvlan device will hit WARN_ON_ONCE() in sk_mc_loop… summary: |- In the Linux kernel, the following vulnerability has been resolved: ipvlan: Dont Use skb->sk in ipvlan_process_v{4,6}_outbound Raw packet from PF_PACKET socket ontop of an IPv6-backed ipvlan device will hit WARN_ON_ONCE() in sk_mc_loop… severity: medium cvss: 5.5 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H' vendor: linux product: linux_kernel affected: - 'linux_kernel >= 3.19, < 4.19.316' - 'linux_kernel >= 4.20, < 5.4.278' - 'linux_kernel >= 5.5, < 5.10.219' - 'linux_kernel >= 5.11, < 5.15.161' - 'linux_kernel >= 5.16, < 6.1.93' - 'linux_kernel >= 6.2, < 6.6.33' - 'linux_kernel >= 6.7, < 6.9.4' - linux_kernel = 6.10 patched: - linux_kernel 6.9.4 published: '2024-06-21' updated: '2026-10-15' sourceUpdated: '2026-10-15T01:17:44.917' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-33621' references: - url: 'https://git.kernel.org/stable/c/0049a623dfbbb49888de7f0c2f33a582b5ead989' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/13c4543db34e0da5a7d2f550b6262d860f248381' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/183c4b416454b9983dc1b8aa0022b748911adc48' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/1abbf079da59ef559d0ab4219d2a0302f7970761' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/54213c09801e0bd2549ac42961093be36f65a7d0' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/54768bacfde60e8e4757968d79f8726711dd2cf5' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/b3dc6e8003b500861fa307e9a3400c52e78e4d3a' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/cb53706a3403ba67f4040b2a82d9cf79e11b1a48' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/0049a623dfbbb49888de7f0c2f33a582b5ead989' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://git.kernel.org/stable/c/13c4543db34e0da5a7d2f550b6262d860f248381' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://git.kernel.org/stable/c/183c4b416454b9983dc1b8aa0022b748911adc48' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://git.kernel.org/stable/c/1abbf079da59ef559d0ab4219d2a0302f7970761' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://git.kernel.org/stable/c/54213c09801e0bd2549ac42961093be36f65a7d0' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://git.kernel.org/stable/c/54768bacfde60e8e4757968d79f8726711dd2cf5' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://git.kernel.org/stable/c/b3dc6e8003b500861fa307e9a3400c52e78e4d3a' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://git.kernel.org/stable/c/cb53706a3403ba67f4040b2a82d9cf79e11b1a48' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://cert-portal.siemens.com/productcert/html/ssa-265688.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e - url: 'https://cert-portal.siemens.com/productcert/html/ssa-613116.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e tags: - nvd - cve.org epss: 0.00268 epssPercentile: 0.18801 ingestedAt: '2026-10-15T03:30:12.710Z' ssvc: exploitation: none automatable: 'no' technicalImpact: partial timestamp: '2024-09-10T17:09:47.521739Z' --- ## Overview In the Linux kernel, the following vulnerability has been resolved: ipvlan: Dont Use skb->sk in ipvlan_process_v{4,6}_outbound Raw packet from PF_PACKET socket ontop of an IPv6-backed ipvlan device will hit WARN_ON_ONCE() in sk_mc_loop() through sch_direct_xmit() path. WARNING: CPU: 2 PID: 0 at net/core/sock.c:775 sk_mc_loop+0x2d/0x70 Modules linked in: sch_netem ipvlan rfkill cirrus drm_shmem_helper sg drm_kms_helper CPU: 2 PID: 0 Comm: swapper/2 Kdump: loaded Not tainted 6.9.0+ #279 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:sk_mc_loop+0x2d/0x70 Code: fa 0f 1f 44 00 00 65 0f b7 15 f7 96 a3 4f 31 c0 66 85 d2 75 26 48 85 ff 74 1c RSP: 0018:ffffa9584015cd78 EFLAGS: 00010212 RAX: 0000000000000011 RBX: ffff91e585793e00 RCX: 0000000002c6a001 RDX: 0000000000000000 RSI: 0000000000000040 RDI: ffff91e589c0f000 RBP: ffff91e5855bd100 R08: 0000000000000000 R09: 3d00545216f43d00 R10: ffff91e584fdcc50 R11: 00000060dd8616f4 R12: ffff91e58132d000 R13: ffff91e584fdcc68 R14: ffff91e5869ce800 R15: ffff91e589c0f000 FS: 0000000000000000(0000) GS:ffff91e898100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f788f7c44c0 CR3: 0000000008e1a000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ? __warn (kernel/panic.c:693) ? sk_mc_loop (net/core/sock.c:760) ? report_bug (lib/bug.c:201 lib/bug.c:219) ? handle_bug (arch/x86/kernel/traps.c:239) ? exc_invalid_op (arch/x86/kernel/traps.c:260 (discriminator 1)) ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) ? sk_mc_loop (net/core/sock.c:760) ip6_finish_output2 (net/ipv6/ip6_output.c:83 (discriminator 1)) ? nf_hook_slow (net/netfilter/core.c:626) ip6_finish_output (net/ipv6/ip6_output.c:222) ? __pfx_ip6_finish_output (net/ipv6/ip6_output.c:215) ipvlan_xmit_mode_l3 (drivers/net/ipvlan/ipvlan_core.c:602) ipvlan ipvlan_start_xmit (drivers/net/ipvlan/ipvlan_main.c:226) ipvlan dev_hard_start_xmit (net/core/dev.c:3594) sch_direct_xmit (net/sched/sch_generic.c:343) __qdisc_run (net/sched/sch_generic.c:416) net_tx_action (net/core/dev.c:5286) handle_softirqs (kernel/softirq.c:555) __irq_exit_rcu (kernel/softirq.c:589) sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043) The warning triggers as this: packet_sendmsg packet_snd //skb->sk is packet sk __dev_queue_xmit __dev_xmit_skb //q->enqueue is not NULL __qdisc_run sch_direct_xmit dev_hard_start_xmit ipvlan_start_xmit ipvlan_xmit_mode_l3 //l3 mode ipvlan_process_outbound //vepa flag ipvlan_process_v6_outbound ip6_local_out __ip6_finish_output ip6_finish_output2 //multicast packet sk_mc_loop //sk->sk_family is AF_PACKET Call ip{6}_local_out() with NULL sk in ipvlan as other tunnels to fix this. ## Affected - `linux_kernel >= 3.19, < 4.19.316` - `linux_kernel >= 4.20, < 5.4.278` - `linux_kernel >= 5.5, < 5.10.219` - `linux_kernel >= 5.11, < 5.15.161` - `linux_kernel >= 5.16, < 6.1.93` - `linux_kernel >= 6.2, < 6.6.33` - `linux_kernel >= 6.7, < 6.9.4` - `linux_kernel = 6.10` ## Remediation Upgrade past the affected range: - `linux_kernel 6.9.4`