Linux Kernel up to 7.1.3 Kalmia kalmia_rx_fixup out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k3.18-

Summaryinfo

A vulnerability labeled as very critical has been found in Linux Kernel up to 7.1.3. The impacted element is the function kalmia_rx_fixup of the component Kalmia. The manipulation results in out-of-bounds. This vulnerability was named CVE-2026-64351. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.1.3. Affected is the function kalmia_rx_fixup of the component Kalmia. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-64351 since 07/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/25/2026).

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4 or 7.2-rc1 eliminates this vulnerability. Applying the patch 391706889a5112feafdc0c68db3ecc7ed325d09c/aa4eef2cbb66ea3dfcfc24bdce798dd78a81b54b/2d04c37ed4e1d0f733ad39ec35b5a5d8818b4f4a/46ab32870d010e9a057bc5659cea22b7e728ca88/c466097d85d52f3aa200736cb4759e66d4bbf6e3/e24eb271061db384a3c3ef6f107fe515e68ef222/51e65f1d78457ea4f9513d90ab22c9dccbb35110/47b6bcef6e679593d2e86e04ee72c46a4e2f7139 is able to eliminate this problem.

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Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.261/5.15.212/6.1.178/6.6.145/6.12.96/6.18.39/7.1.4/7.2-rc1
Patch: 391706889a5112feafdc0c68db3ecc7ed325d09c/aa4eef2cbb66ea3dfcfc24bdce798dd78a81b54b/2d04c37ed4e1d0f733ad39ec35b5a5d8818b4f4a/46ab32870d010e9a057bc5659cea22b7e728ca88/c466097d85d52f3aa200736cb4759e66d4bbf6e3/e24eb271061db384a3c3ef6f107fe515e68ef222/51e65f1d78457ea4f9513d90ab22c9dccbb35110/47b6bcef6e679593d2e86e04ee72c46a4e2f7139

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
07/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64351 (🔒)
GCVE (CVE): GCVE-0-2026-64351
GCVE (VulDB): GCVE-100-383148

Entryinfo

Created: 07/25/2026 16:38
Changes: 07/25/2026 16:38 (59)
Complete: 🔍
Cache ID: 216::103

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