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CVE-2026-72348— netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于netfilter ip6tables的ah、hbh和rt匹配对IPv6扩展头长度检查不足，可能导致畸形数据包绕过预期丢弃规则。

CVSS 9.1 · Critical EPSS 0.63% · P49

Possible ATT&CK Techniques 1 AI

T1564.008 · Email Hiding Rules

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f16d856b6af5fd0e7cb0b0212f70825b599ef72e affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< fc416870100cf16d5b9495199355a679c3a02d48 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f775fcf384b06f35b612f78fa5601fee99eb6513 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2fd89a50a9783eed8ed23866b11c8b3d8779a7a8 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3578b6d92a5b1e603ae6e8c8f5538a709f03aba4 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3d441be2b1c5e98167302fa1c7b61960a067b112 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 43ccc20b5a733226417832cf16ef45322e594990 affected
… +10 more rows
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I. Basic Information for CVE-2026-72348

Vulnerability Information
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Vulnerability Title
netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop The ah, hbh and rt matches check that the fixed extension header is present, then use the header length field to derive the advertised extension header length for matching. For the ah match, add the missing advertised-length check. For hbh and rt, update the existing advertised-length checks. In all three cases, set hotdrop to true before returning false when the advertised extension header length exceeds the available skb data. Returning false treats the packet as a rule mismatch. Set hotdrop to true and drop malformed packets so they cannot bypass rules intended to drop packets with these IPv6 extension headers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于netfilter ip6tables的ah、hbh和rt匹配对IPv6扩展头长度检查不足，可能导致畸形数据包绕过预期丢弃规则。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ f16d856b6af5fd0e7cb0b0212f70825b599ef72e -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-72348

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III. Intelligence Information for CVE-2026-72348

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Patches & Fixes for CVE-2026-72348 (8)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74361 9.8 CRITICAL nvme: fix FDP fdpcidx bounds check
CVE-2026-74436 9.8 CRITICAL rxrpc: serialize kernel accept preallocation with socket teardown
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72069 9.8 CRITICAL locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()
CVE-2026-72185 9.8 CRITICAL ntfs: fix WARN_ON for resident attribute in ntfs_map_runlist_nolock()
CVE-2026-72249 9.8 CRITICAL netfilter: flowtable: use dst in this direction when pushing IPIP header
CVE-2026-72494 9.8 CRITICAL RDMA/irdma: Replace waitqueue and flag with completion
CVE-2026-72248 9.8 CRITICAL netfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-72491 9.8 CRITICAL net/9p: fix race condition on rdma->state in trans_rdma.c
CVE-2026-72251 9.8 CRITICAL netfilter: nf_nat_sip: reload possible stale data pointer
CVE-2026-74480 9.8 CRITICAL net: bridge: stop fast-leave after deleting a port group

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72348

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