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CVE-2026-68299— vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets

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 4.2版本存在安全漏洞，该漏洞源于vmxnet3_get_hdr_len()函数对Geneve封装数据包处理不当，未考虑VMXNET3_RCD_HDR_INNER_SHIFT位导致内外头不匹配，可能触发BUG_ON引发内核崩溃。

CVSS 7.5 · High EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc< 2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0 affected
45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc< fbab6b73cc086e32698c86e43d1b16bf17d24c36 affected
45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc< 28e382646417c7e2be9c9a7079eddf627ff52b90 affected
45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc< 667b6e52048eaf4dbcf1707ed87ffd44abb9cb38 affected
45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc< 28cb5d8d13b4c1faf3f688f62e5df82fe7b438d8 affected
45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc< 4fdb0f162ccdbe9626863b10003855703253fa29 affected
45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc< b28596baf87e25a078789f1c05817c8a3bf71257 affected
45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc< 34a71f5361fc3adb5b7138da78750b0d535a8252 affected
… +10 more rows
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I. Basic Information for CVE-2026-68299

Vulnerability Information
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Vulnerability Title
vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets vmxnet3_get_hdr_len() assumes gdesc->rcd.v4/v6/tcp always describe the outer header, but for a Geneve-encapsulated packet the device can set them based on the inner header instead, signalled by the VMXNET3_RCD_HDR_INNER_SHIFT bit in the completion descriptor. Since the function never skips the outer encapsulation, this mismatch triggers: - BUG_ON(hdr.ipv4->protocol != IPPROTO_TCP), because the outer protocol is UDP (Geneve), not TCP. - BUG_ON(hdr.eth->h_proto != ...), when the tunnel's outer and inner IP versions differ (e.g. outer IPv6/inner IPv4 or vice versa). Check VMXNET3_RCD_HDR_INNER_SHIFT up front and bail out, since the function cannot locate the inner header it would need to parse. Also convert the remaining BUG_ON()s in this function to return 0 defensively.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 4.2版本存在安全漏洞，该漏洞源于vmxnet3_get_hdr_len()函数对Geneve封装数据包处理不当，未考虑VMXNET3_RCD_HDR_INNER_SHIFT位导致内外头不匹配，可能触发BUG_ON引发内核崩溃。
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 45dac1d6ea045ae56e4df8d9c70c92c7412bd4fc ~ 2ddf51fcb6dd7d55ceef38e2e1a5ab2ab7fd47b0 -
Linux Linux 4.2 -

II. Public POCs for CVE-2026-68299

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III. Intelligence Information for CVE-2026-68299

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Patches & Fixes for CVE-2026-68299 (8)

Same Patch Batch · Linux · 2026-08-10 · 344 CVEs total

CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow

Showing top 20 of 344 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68299

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