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CVE-2026-64351— net: usb: kalmia: bound RX frame length in kalmia_rx_fixup()

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存在安全漏洞，该漏洞源于kalmia_rx_fixup()函数中usb_packet_length计算不当，当skb->len较小时导致整数下溢，绕过截断检查，利用设备提供的ether_packet_length驱动memcmp和skb_trim/skb_pull操作超出接收缓冲区边界，造成越界读取。

AI Predicted 7.8 Difficulty: Easy EPSS 0.13% · P2

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux d40261236e8e278cb1936cb5e934262971692b10< 391706889a5112feafdc0c68db3ecc7ed325d09c affected
d40261236e8e278cb1936cb5e934262971692b10< aa4eef2cbb66ea3dfcfc24bdce798dd78a81b54b affected
d40261236e8e278cb1936cb5e934262971692b10< 2d04c37ed4e1d0f733ad39ec35b5a5d8818b4f4a affected
d40261236e8e278cb1936cb5e934262971692b10< 46ab32870d010e9a057bc5659cea22b7e728ca88 affected
d40261236e8e278cb1936cb5e934262971692b10< c466097d85d52f3aa200736cb4759e66d4bbf6e3 affected
d40261236e8e278cb1936cb5e934262971692b10< e24eb271061db384a3c3ef6f107fe515e68ef222 affected
d40261236e8e278cb1936cb5e934262971692b10< 51e65f1d78457ea4f9513d90ab22c9dccbb35110 affected
d40261236e8e278cb1936cb5e934262971692b10< 47b6bcef6e679593d2e86e04ee72c46a4e2f7139 affected
… +10 more rows
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I. Basic Information for CVE-2026-64351

Vulnerability Information
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Vulnerability Title
net: usb: kalmia: bound RX frame length in kalmia_rx_fixup()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: usb: kalmia: bound RX frame length in kalmia_rx_fixup() kalmia_rx_fixup() computes usb_packet_length = skb->len - (2 * KALMIA_HEADER_LENGTH) as a u16, guarded only by a pre-loop check that skb->len is at least KALMIA_HEADER_LENGTH, which is 6. A device can deliver a short bulk-IN frame with skb->len in the 6 to 11 range, or leave a short trailing remainder on a later loop iteration. Either case underflows usb_packet_length to about 65530. That bypasses the usb_packet_length < ether_packet_length truncation path. The device-supplied ether_packet_length, a le16 up to 65535 read from header_start[2], then drives a memcmp() and the following skb_trim() and skb_pull() past the end of the rx buffer. The rx buffer is hard_mtu * 10, which is 14000 bytes. That is an out of bounds read. Require both the start and end framing headers to be present before subtracting them, on every loop iteration.
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存在安全漏洞，该漏洞源于kalmia_rx_fixup()函数中usb_packet_length计算不当，当skb->len较小时导致整数下溢，绕过截断检查，利用设备提供的ether_packet_length驱动memcmp和skb_trim/skb_pull操作超出接收缓冲区边界，造成越界读取。
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 d40261236e8e278cb1936cb5e934262971692b10 ~ 391706889a5112feafdc0c68db3ecc7ed325d09c -
Linux Linux 3.0 -

II. Public POCs for CVE-2026-64351

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III. Intelligence Information for CVE-2026-64351

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Patches & Fixes for CVE-2026-64351 (8)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
CVE-2026-64410 9.8 CRITICAL netfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-64399 9.8 CRITICAL ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-64397 9.8 CRITICAL ksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-64391 9.8 CRITICAL ksmbd: use opener credentials for ADS I/O
CVE-2026-64387 9.8 CRITICAL smb: client: fix query directory replay double-free
CVE-2026-64386 9.8 CRITICAL smb: client: fix query_info() replay double-free
CVE-2026-64385 9.8 CRITICAL smb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-64383 9.8 CRITICAL smb: client: fix double-free in SMB2_flush() replay
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64257 9.1 CRITICAL smb: client: reject overlapping data areas in SMB2 responses
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length
CVE-2026-64320 9.1 CRITICAL nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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