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CVE-2026-63899— USB: serial: mxuport: fix memory corruption with small endpoint

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基金会开源的一款操作系统内核。 Linux kernel 3.14版本存在安全漏洞，该漏洞源于USB serial mxuport驱动中端点最大数据包大小处理不当，可能导致恶意设备报告更小的大小时发生用户控制的slab内存损坏。

AI Predicted 5.5 Difficulty: Hard EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e< 086b858b5f5125bc9d967ea2bd825f83d9f8f29d affected
ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e< 2f3661eb2446e1ef593da45e01a3b21a906768ec affected
ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e< ccbec56f2f9af008f1574335cc6a668f16603e47 affected
ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e< be3a1ed4ae51fa8dde57383277d336ce834f2cd9 affected
ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e< e906545641d34fb1a09a65b4b5cfdff40eb09681 affected
ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e< 6c0cf56f00f280d72180bb6ce79741bc787a6269 affected
ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e< b40166b4ef96067620a0f248e74ad9658c8f680c affected
ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e< 4085f0dbb1ce2251c9a5938d693de6593f0ab2bd affected
… +10 more rows
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I. Basic Information for CVE-2026-63899

Vulnerability Information
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Vulnerability Title
USB: serial: mxuport: fix memory corruption with small endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: USB: serial: mxuport: fix memory corruption with small endpoint Make sure that the bulk-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption should a malicious device report a smaller size.
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基金会开源的一款操作系统内核。 Linux kernel 3.14版本存在安全漏洞，该漏洞源于USB serial mxuport驱动中端点最大数据包大小处理不当，可能导致恶意设备报告更小的大小时发生用户控制的slab内存损坏。
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 ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e ~ 086b858b5f5125bc9d967ea2bd825f83d9f8f29d -
Linux Linux 3.14 -

II. Public POCs for CVE-2026-63899

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III. Intelligence Information for CVE-2026-63899

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Patches & Fixes for CVE-2026-63899 (6)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-63922 9.8 CRITICAL ipv6: exthdrs: refresh nh after handling HAO option
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-64150 9.8 CRITICAL netfilter: nft_inner: release local_lock before re-enabling softirqs
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-64132 9.8 CRITICAL ipv6: ioam: refresh hdr pointer before ioam6_event()
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes
CVE-2026-63857 9.8 CRITICAL net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-64016 9.8 CRITICAL ksmbd: fix durable reconnect error path file lifetime
CVE-2026-64162 9.8 CRITICAL idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-63899

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