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CVE-2026-63904— usb: usbtmc: check URB actual_length for interrupt-IN notifications

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 4.6版本存在安全漏洞，该漏洞源于对URB实际长度检查不足，可能导致越界读取或使用先前通知中的陈旧残留数据。

AI Predicted 7.5 Difficulty: Easy EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux dbf3e7f654c0f06a932b8fcafac78de9d0b81d68< e794bd67b3faf98af46f958897f6b91412c7d2a9 affected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68< e3eec3005de44e7f37d8d7724be636446516ab42 affected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68< ae87f505917e703ae3b487d9663d78826ff43608 affected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68< 5de7df75ef3a2756b25fe3d582a4a2970444fe5a affected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68< 69020fa089f1bf0e1a10a15265f31b143a846409 affected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68< 75f6d3da2cc646983f41807ef98851569c12bca9 affected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68< f141b01eaa58ac7e323931d670318aa247bff087 affected
dbf3e7f654c0f06a932b8fcafac78de9d0b81d68< 52f2ad3f7e5eb3b5908e1d685d4342519dc9cfcd affected
… +10 more rows
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I. Basic Information for CVE-2026-63904

Vulnerability Information
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Vulnerability Title
usb: usbtmc: check URB actual_length for interrupt-IN notifications
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: usbtmc: check URB actual_length for interrupt-IN notifications USBTMC devices can use an optional interrupt endpoint for notification messages. These typically contain two-byte headers indicating the payload format, but the driver does not check if these headers are present before accessing the data buffers. In cases where the URB actual_length is not enough to fit these headers, the driver will either cause an out-of-bounds read, or consume stale leftover data from a previous notification. Fix by checking if actual_data contains enough bytes for the headers, otherwise resubmit URB to the interrupt endpoint.
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 4.6版本存在安全漏洞，该漏洞源于对URB实际长度检查不足，可能导致越界读取或使用先前通知中的陈旧残留数据。
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 dbf3e7f654c0f06a932b8fcafac78de9d0b81d68 ~ e794bd67b3faf98af46f958897f6b91412c7d2a9 -
Linux Linux 4.6 -

II. Public POCs for CVE-2026-63904

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III. Intelligence Information for CVE-2026-63904

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Patches & Fixes for CVE-2026-63904 (7)

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-2026-63904

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