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CVE-2026-68411— wifi: mac80211_hwsim: clamp virtio RX length before skb_put

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 5.7版本存在安全漏洞，该漏洞源于hwsim_virtio_rx_work函数未对virtio RX长度进行限制，将设备报告的长度直接传入skb_put，当长度大于接收缓冲区剩余空间时可能导致缓冲区越界，触发skb_over_panic，造成拒绝服务。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.18% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 5d44fe7c9808c56e136e59147bd932f5491520f1< 7f9d678b870fca8eaf1d46fa915cba0b1d5b387a affected
5d44fe7c9808c56e136e59147bd932f5491520f1< 909573d6a9b67354fc0515952574564e7c909c62 affected
5d44fe7c9808c56e136e59147bd932f5491520f1< 5779e4a33e1666ddfeba43e96e29c4a9e5254ff0 affected
5d44fe7c9808c56e136e59147bd932f5491520f1< 82c5a30a66e2a7337d99476c67d6fc1a99c4250e affected
5d44fe7c9808c56e136e59147bd932f5491520f1< fade308845c89f784da8a6780c1e77258488f1b6 affected
5d44fe7c9808c56e136e59147bd932f5491520f1< 6dc76371a9a360c29de00df5b11563102d9d675a affected
5d44fe7c9808c56e136e59147bd932f5491520f1< 99dc05c75acc3c8cde8d89c5371f4b569de5ac62 affected
5d44fe7c9808c56e136e59147bd932f5491520f1< 10a2b430f8f06ae14b9590b6f6faa6b588ef0654 affected
… +10 more rows
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I. Basic Information for CVE-2026-68411

Vulnerability Information
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Vulnerability Title
wifi: mac80211_hwsim: clamp virtio RX length before skb_put
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211_hwsim: clamp virtio RX length before skb_put hwsim_virtio_rx_work() passes the virtqueue used-ring length reported by the device straight to skb_put() on a fixed-size receive skb. A backend reporting a length larger than the skb tailroom drives skb_put() past the buffer end and hits skb_over_panic() -- a host-triggerable guest panic (denial of service). Clamp the length to the skb's available room before skb_put(). A conforming device never reports more than the posted buffer size, so valid frames are unaffected; a truncated over-report then fails the length/header checks in hwsim_virtio_handle_cmd() and is dropped, so truncating rather than dropping here cannot be turned into a parsing problem.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 5.7版本存在安全漏洞，该漏洞源于hwsim_virtio_rx_work函数未对virtio RX长度进行限制，将设备报告的长度直接传入skb_put，当长度大于接收缓冲区剩余空间时可能导致缓冲区越界，触发skb_over_panic，造成拒绝服务。
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 5d44fe7c9808c56e136e59147bd932f5491520f1 ~ 7f9d678b870fca8eaf1d46fa915cba0b1d5b387a -
Linux Linux 5.7 -

II. Public POCs for CVE-2026-68411

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III. Intelligence Information for CVE-2026-68411

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Patches & Fixes for CVE-2026-68411 (7)

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

CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
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-2026-68156 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-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
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-2026-68411

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