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Linux Kernel CVE-2026-53196

| EUVDEUVD-2026-39287 MEDIUM
Out-of-bounds Write (CWE-787)
2026-06-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-f3q5-7m6p-4qxq
Buffer Overflow Linux Memory Corruption
6.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.8 MEDIUM
AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
6.8 MEDIUM

Exploitation needs a malicious USB device physically attached (AV:P) but no credentials and no special complexity once probed (PR:N/AC:L); heap corruption yields full kernel C/I/A impact.

3.1 AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
6.8 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Physical
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

7
Severity Changed
Jul 01, 2026 - 13:22 NVD
HIGH MEDIUM
CVSS changed
Jul 01, 2026 - 13:22 NVD
7.0 (HIGH) 6.8 (MEDIUM)
Analysis Generated
Jun 30, 2026 - 05:32 vuln.today
CVSS changed
Jun 30, 2026 - 03:24 NVD
7.0 (HIGH)
Patch available
Jun 25, 2026 - 10:32 EUVD
CVE Published
Jun 25, 2026 - 09:16 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 25, 2026 - 09:16 cve.org
HIGH 7.0

DescriptionNVD

In the Linux kernel, the following vulnerability has been resolved:

USB: serial: io_ti: fix heap overflow in get_manuf_info()

get_manuf_info() reads le16_to_cpu(rom_desc->Size) bytes from the device I2C EEPROM into a buffer allocated with kmalloc_obj(), which is sizeof(struct edge_ti_manuf_descriptor) = 10 bytes.

The Size field comes from the device and is only validated (in check_i2c_image()) to make sure the descriptor fits within TI_MAX_I2C_SIZE (16384 bytes), not against the destination buffer size. A malicious USB device can therefore set Size to any value up to 16377, causing a heap overflow of up to 16367 bytes when plugged into a host running this driver.

valid_csum() is called after read_rom() and also iterates buffer[0..Size-1], compounding the out-of-bounds access.

Fix by rejecting descriptors with unexpected length before calling read_rom().

[ johan: amend commit message; also check for short descriptors ]

AnalysisAI

Heap buffer overflow in the Linux kernel's io_ti USB serial driver (get_manuf_info()) lets a malicious USB device overflow a 10-byte kmalloc buffer by up to ~16 KB when attached to a host using this driver. The driver trusts the EEPROM-supplied descriptor Size field (validated only against TI_MAX_I2C_SIZE, not the destination buffer), enabling kernel memory corruption with high confidentiality, integrity, and availability impact. No public exploit identified at time of analysis; EPSS is low (0.20%, 10th percentile) and the issue is not in CISA KEV.

Technical ContextAI

The io_ti driver supports TI 3410/5052 and Edgeport USB-to-serial converters. During device initialization it reads a manufacturing descriptor from the device's I2C EEPROM via read_rom(). get_manuf_info() allocates a buffer sized to struct edge_ti_manuf_descriptor (10 bytes) but copies le16_to_cpu(rom_desc->Size) bytes from device-controlled data. check_i2c_image() only bounds Size against TI_MAX_I2C_SIZE (16384), never against the smaller destination allocation, so a Size up to 16377 yields a write of up to 16367 bytes past the buffer. valid_csum() then iterates buffer[0..Size-1], compounding the out-of-bounds read. This is CWE-787 (Out-of-bounds Write): a classic failure to validate an attacker-supplied length against the actual target buffer size before a copy.

RemediationAI

Vendor-released patch: upgrade to a fixed stable kernel - 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13, or 7.1 (or later in each series), or apply the corresponding stable commits from git.kernel.org (e.g. b849f30d1a9e/183c1076eca4). The upstream fix rejects manufacturing descriptors of unexpected length (both oversized and short) before calling read_rom(). Track distro-specific builds via the Red Hat advisory (access.redhat.com/security/cve/CVE-2026-53196) and CSAF VEX. As a compensating control where patching is delayed, prevent the io_ti driver from binding untrusted devices: blacklist the io_ti module (echo 'blacklist io_ti' to /etc/modprobe.d, side effect - legitimate TI/Edgeport USB serial adapters stop working), or enforce USB device authorization / USBGuard policies to allow only known-good USB serial devices (side effect - operational overhead maintaining an allowlist). Physically restricting USB port access also reduces exposure since exploitation requires attaching a malicious device.

Same weakness CWE-787 – Out-of-bounds Write

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.177 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.155 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.206 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.152 Affected
Image SLES15-SP7-Azure-3P Image SLES15-SP7-Azure-Basic Image SLES15-SP7-Azure-Standard Image SLES15-SP7-HPC-Azure Affected
Image SLES15-SP7-BYOS-Azure Image SLES15-SP7-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-Aliyun Image SLES15-SP7-CHOST-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-EC2 Image SLES15-SP7-CHOST-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-GDC Image SLES15-SP7-CHOST-BYOS-SAP-CCloud Image SLES15-SP7-EC2 Image SLES15-SP7-EC2-ECS-HVM Image SLES15-SP7-GCE Image SLES15-SP7-HPC-BYOS-Azure Image SLES15-SP7-HPC-BYOS-EC2 Image SLES15-SP7-HPC-BYOS-GCE Image SLES15-SP7-Hardened-BYOS-Azure Image SLES15-SP7-Hardened-BYOS-EC2 Image SLES15-SP7-Hardened-BYOS-GCE Image SLES15-SP7-SAPCAL-Azure Image SLES15-SP7-SAPCAL-EC2 Image SLES15-SP7-SAPCAL-GCE Affected
Image SLES15-SP7-SAP-Azure Image SLES15-SP7-SAP-Azure-3P Image SLES15-SP7-SAP-BYOS-Azure Image SLES15-SP7-SAP-BYOS-EC2 Image SLES15-SP7-SAP-BYOS-GCE Image SLES15-SP7-SAP-EC2 Image SLES15-SP7-SAP-GCE Image SLES15-SP7-SAP-Hardened-Azure Image SLES15-SP7-SAP-Hardened-BYOS-Azure Image SLES15-SP7-SAP-Hardened-BYOS-EC2 Image SLES15-SP7-SAP-Hardened-BYOS-GCE Image SLES15-SP7-SAP-Hardened-GCE Affected

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CVE-2026-53196 vulnerability details – vuln.today
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