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CVE-2026-31623— net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于cdc-phonet中skb frags数组溢出，因为未限制片段数量。

AI Predicted 7.8 Difficulty: Easy EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 87cf65601e1709e57f7e28f0f7b3eb0a992c1782< 6807ff49bf796b3823b1e29f97b69316a40a9a94 affected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782< 0c5c65a17db729fc63ab656bdaaf0e675a9dbeac affected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782< 6053620fdbcd89fa7e755644efdaab78e0daaae7 affected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782< d4e1946bea8d6441835eb3fd09b19237ba366a6f affected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782< a23b1b1aaf41e174181d5853a70e65d4d01e648c affected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782< c183d5775129a0a7495bd61a6e57ec230dcf01e5 affected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782< ebf75c6301c4972a87542ebf2d994c6391eb5d46 affected
87cf65601e1709e57f7e28f0f7b3eb0a992c1782< 9989938d13cc5ba8447eeed5a61acfcf61bc6801 affected
… +12 more rows
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I. Basic Information for CVE-2026-31623

Vulnerability Information
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Vulnerability Title
net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete() A malicious USB device claiming to be a CDC Phonet modem can overflow the skb_shared_info->frags[] array by sending an unbounded sequence of full-page bulk transfers. Drop the skb and increment the length error when the frag limit is reached. This matches the same fix that commit f0813bcd2d9d ("net: wwan: t7xx: fix potential skb->frags overflow in RX path") did for the t7xx driver.
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于cdc-phonet中skb frags数组溢出，因为未限制片段数量。
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 87cf65601e1709e57f7e28f0f7b3eb0a992c1782 ~ 6807ff49bf796b3823b1e29f97b69316a40a9a94 -
Linux Linux 2.6.31 -

II. Public POCs for CVE-2026-31623

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III. Intelligence Information for CVE-2026-31623

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Patches & Fixes for CVE-2026-31623 (5)

Same Patch Batch · Linux · 2026-04-24 · 138 CVEs total

CVE-2026-31649 9.8 CRITICAL net: stmmac: fix integer underflow in chain mode
CVE-2026-31607 9.8 CRITICAL usbip: validate number_of_packets in usbip_pack_ret_submit()
CVE-2026-31633 9.8 CRITICAL rxrpc: Fix integer overflow in rxgk_verify_response()
CVE-2026-31608 9.8 CRITICAL smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list
CVE-2026-31669 9.8 CRITICAL mptcp: fix slab-use-after-free in __inet_lookup_established
CVE-2026-31668 9.8 CRITICAL seg6: separate dst_cache for input and output paths in seg6 lwtunnel
CVE-2026-31589 9.8 CRITICAL mm: call ->free_folio() directly in folio_unmap_invalidate()
CVE-2026-31609 9.8 CRITICAL smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
CVE-2026-31536 9.8 CRITICAL smb: server: let send_done handle a completion without IB_SEND_SIGNALED
CVE-2026-31637 9.8 CRITICAL rxrpc: reject undecryptable rxkad response tickets
CVE-2026-31657 9.8 CRITICAL batman-adv: hold claim backbone gateways by reference
CVE-2026-31659 9.8 CRITICAL batman-adv: reject oversized global TT response buffers
CVE-2026-31636 9.1 CRITICAL rxrpc: fix RESPONSE authenticator parser OOB read
CVE-2026-31629 8.8 HIGH nfc: llcp: add missing return after LLCP_CLOSED checks
CVE-2026-31570 8.8 HIGH can: gw: fix OOB heap access in cgw_csum_crc8_rel()
CVE-2026-31622 8.8 HIGH NFC: digital: Bounds check NFC-A cascade depth in SDD response handler
CVE-2026-31558 8.8 HIGH LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust
CVE-2026-31553 8.8 HIGH KVM: arm64: Fix the descriptor address in __kvm_at_swap_desc()
CVE-2026-31588 8.8 HIGH KVM: x86: Use scratch field in MMIO fragment to hold small write values
CVE-2026-31611 8.6 HIGH ksmbd: require 3 sub-authorities before reading sub_auth[2]

Showing top 20 of 138 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31623

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