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CVE-2026-74649— staging: rtl8723bs: fix missing shared-key auth challenge length check

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.

在 Linux 内核中，已修复以下漏洞： staging: rtl8723bs: 修复缺失的共享密钥认证挑战长度检查 WEP 共享密钥认证处理程序使用了由攻击者控制的 challenge-text（挑战文本）元素长度，而未将其与固定的 128 字节缓冲区 进行校验。 在 函数中， 返回的长度值（最大可达 255）被直接用于向大小为 128 字节的 缓冲区执行 操作。因此，恶意接入点（AP）可以通过发送格式错误的 元素，导致 缓冲区发生最多 127 字节的溢出或填充不足。该漏洞可在空中（over the air）于关

CVSS 8.8 · High EPSS 0.29% · P21

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 554c0a3abf216c991c5ebddcdb2c08689ecd290b< 39ae1033071001af9bb4573ebdbb43bbbe88f749 affected
554c0a3abf216c991c5ebddcdb2c08689ecd290b< 4d018e7d7d908bdfcb5ecfa922b1d5cb9ddb3722 affected
554c0a3abf216c991c5ebddcdb2c08689ecd290b< 4ba402fd47009d20e51dbfc934abb562098ea35b affected
554c0a3abf216c991c5ebddcdb2c08689ecd290b< 87c2f073d2aaea041d531b8e579c47570b54b3b7 affected
554c0a3abf216c991c5ebddcdb2c08689ecd290b< a28a4b0592e4a37ea471bc0d308513a93133ce7e affected
554c0a3abf216c991c5ebddcdb2c08689ecd290b< 6235b5156b48ed5d1ce3410d8f0b2fd67d30d944 affected
554c0a3abf216c991c5ebddcdb2c08689ecd290b< 2c56ef658ac8c6bca36bc5574715e8f717207c6c affected
4.12 affected
… +8 more rows
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I. Basic Information for CVE-2026-74649

Vulnerability Information
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Vulnerability Title
staging: rtl8723bs: fix missing shared-key auth challenge length check
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix missing shared-key auth challenge length check The WEP shared-key authentication handler uses the challenge-text element's attacker-controlled length without checking it against the fixed 128-byte chg_txt buffer. In OnAuthClient() the length from rtw_get_ie() - up to 255 - is used to perform memcpy() into the 128-byte pmlmeinfo->chg_txt, so a malicious AP sending a malformed WLAN_EID_CHALLENGE element can overflow/underfill chg_txt by up to 127 bytes. It is reachable over the air, before association, during shared-key authentication. In the case of an overflow, the driver can write out of bounds. In the case of an underfill, the driver can echo stale buffer memory. The challenge text is defined to be exactly 128 octets, which is already provided as the WLAN_AUTH_CHALLENGE_LEN define; require the element to be exactly that length before use.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 554c0a3abf216c991c5ebddcdb2c08689ecd290b ~ 39ae1033071001af9bb4573ebdbb43bbbe88f749 -
Linux Linux 4.12 -

II. Public POCs for CVE-2026-74649

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III. Intelligence Information for CVE-2026-74649

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Patches & Fixes for CVE-2026-74649 (5)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74712 9.3 CRITICAL vdpa/mlx5: Fix buffer length in create_direct_keys()
CVE-2026-74665 9.1 CRITICAL net: fix skb length accounting after generic XDP frag adjustment

Showing top 20 of 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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