net: usb: kalmia: bound RX frame length in kalmia_rx_fixup()
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 4 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 3.0 and later | 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2 | Patch available | CNA |
- Linux VendorLinux Affected 3.0 and later Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2 Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 3.0.1 to before 5.10.261; 5.11 to before 5.15.212; 5.16 to before 6.1.178; 6.2 to before 6.6.145; 6.7 to before 6.12.96; 6.13 to before 6.18.39; 6.19 to before 7.1.4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.0:-:*:*:*:*:*:* | 3.0 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.0:rc4:*:*:*:*:*:* | 3.0 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.0:rc5:*:*:*:*:*:* | 3.0 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.0:rc6:*:*:*:*:*:* | 3.0 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.0:rc7:*:*:*:*:*:* | 3.0 rc7 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.0.1 to before 5.10.261; 5.11 to before 5.15.212; 5.16 to before 6.1.178; 6.2 to before 6.6.145; 6.7 to before 6.12.96; 6.13 to before 6.18.39; 6.19 to before 7.1.4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.0:-:*:*:*:*:*:* Versions 3.0 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.0:rc4:*:*:*:*:*:* Versions 3.0 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.0:rc5:*:*:*:*:*:* Versions 3.0 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.0:rc6:*:*:*:*:*:* Versions 3.0 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.0:rc7:*:*:*:*:*:* Versions 3.0 rc7 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2026-64351
- 2026-10-03 Alias added: GHSA-8qc4-xrrp-xx3v
- 2026-10-13 Affected versions changed · Red Hat
- 2026-11-03 CVSS score changed · Red Hat
- 2026-11-06 CISA SSVC decision points changed
References
Patch 8
- https://git.kernel.org/stable/c/391706889a5112feafdc0c68db3ecc7ed325d09c
- https://git.kernel.org/stable/c/aa4eef2cbb66ea3dfcfc24bdce798dd78a81b54b
- https://git.kernel.org/stable/c/2d04c37ed4e1d0f733ad39ec35b5a5d8818b4f4a
- https://git.kernel.org/stable/c/46ab32870d010e9a057bc5659cea22b7e728ca88
- https://git.kernel.org/stable/c/c466097d85d52f3aa200736cb4759e66d4bbf6e3
- https://git.kernel.org/stable/c/e24eb271061db384a3c3ef6f107fe515e68ef222
- https://git.kernel.org/stable/c/51e65f1d78457ea4f9513d90ab22c9dccbb35110
- https://git.kernel.org/stable/c/47b6bcef6e679593d2e86e04ee72c46a4e2f7139
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- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2026-64351 · CVE Program
- CVE-2026-64351 · NVD
- FIRST EPSS
- GHSA-8qc4-xrrp-xx3v · GitHub Advisory Database · CC BY 4.0
- CVE-2026-64351 · Red Hat security data · CC BY 4.0
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