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CVE-2026-68373— wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()

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at76_guess_freq()函数在处理信标或探测响应帧时，仅检查帧至少为24字节的802.11头，减去固定管理体偏移量时未验证帧长度，导致IE长度下溢，可能造成扫描期间越界读取。

CVSS 8.1 · High EPSS 0.28% · P20

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1264b951463a00efebe1bb596499aaad620ec8af< cb831aff2f850f72bc5ff5ad77d0a70bb5a84061 affected
1264b951463a00efebe1bb596499aaad620ec8af< 4875680d1703f56afa6257ba30244f2fb44ed205 affected
1264b951463a00efebe1bb596499aaad620ec8af< b406f33d234f98c8b310fdab5cbb492d85e98e49 affected
1264b951463a00efebe1bb596499aaad620ec8af< e165a1d295e7e814e13b0f92c86e5d48309509ce affected
1264b951463a00efebe1bb596499aaad620ec8af< bcde7249d45f52f994a9872bedf45994472ade77 affected
1264b951463a00efebe1bb596499aaad620ec8af< fb1b50ab699211e777dca5ccfb648788b6a6e519 affected
1264b951463a00efebe1bb596499aaad620ec8af< f742d9c98b5c504fc9e6744eef13a721c2aea486 affected
1264b951463a00efebe1bb596499aaad620ec8af< 61a799ffd1e5a4fd3702d547828b7ff3d161468e affected
… +10 more rows
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I. Basic Information for CVE-2026-68373

Vulnerability Information
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Vulnerability Title
wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: wifi: at76c50x-usb: avoid length underflow in at76_guess_freq() at76_guess_freq() checks only that the received frame is at least a bare 802.11 header (24 bytes) before subtracting the fixed management-body offset: len -= el_off; For both beacon and probe response frames, el_off is 36. If the frame is shorter than el_off, subtracting it causes the calculated IE length to wrap. The length is eventually passed to cfg80211_find_elem_match() as a very large unsigned value, so the element walk runs beyond the RX skb. This path is reached from at76_rx_tasklet() while scanning. If the device delivers a truncated beacon or probe response, the oversized IE length causes an out-of-bounds read during scanning. Skip the IE lookup if the frame does not reach the variable elements, before subtracting el_off.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/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存在安全漏洞，该漏洞源于at76_guess_freq()函数在处理信标或探测响应帧时，仅检查帧至少为24字节的802.11头，减去固定管理体偏移量时未验证帧长度，导致IE长度下溢，可能造成扫描期间越界读取。
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 1264b951463a00efebe1bb596499aaad620ec8af ~ cb831aff2f850f72bc5ff5ad77d0a70bb5a84061 -
Linux Linux 2.6.30 -

II. Public POCs for CVE-2026-68373

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III. Intelligence Information for CVE-2026-68373

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Patches & Fixes for CVE-2026-68373 (8)

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

CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
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-2026-68156 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-2026-68160 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-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
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

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