CVE-2026-64351: Linux kernel · net: usb: kalmia: bound RX frame length in kalmia_rx_fixup()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in e24eb271061db384a3c3ef6f107fe515e68ef222 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:04 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in e24eb271061db384a3c3ef6f107fe515e68ef222, c466097d85d52f3aa200736cb4759e66d4bbf6e3, aa4eef2cbb66ea3dfcfc24bdce798dd78a81b54b +5
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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.
References
- git.kernel.org/stable/c/391706889a5112feafdc0c68db3ecc7ed325d09c (opens in a new tab)
- git.kernel.org/stable/c/aa4eef2cbb66ea3dfcfc24bdce798dd78a81b54b (opens in a new tab)
- git.kernel.org/stable/c/2d04c37ed4e1d0f733ad39ec35b5a5d8818b4f4a (opens in a new tab)
- git.kernel.org/stable/c/46ab32870d010e9a057bc5659cea22b7e728ca88 (opens in a new tab)
- git.kernel.org/stable/c/c466097d85d52f3aa200736cb4759e66d4bbf6e3 (opens in a new tab)
- git.kernel.org/stable/c/e24eb271061db384a3c3ef6f107fe515e68ef222 (opens in a new tab)
- git.kernel.org/stable/c/51e65f1d78457ea4f9513d90ab22c9dccbb35110 (opens in a new tab)
- git.kernel.org/stable/c/47b6bcef6e679593d2e86e04ee72c46a4e2f7139 (opens in a new tab)