Linux Kernel up to 6.19.5 arm64 buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.6$5k-$25k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.19.5. Affected is an unknown function of the component arm64. The manipulation leads to buffer overflow. This vulnerability is documented as CVE-2026-43261. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.19.5 and classified as critical. This issue affects an unknown functionality of the component arm64. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: arm64: Add support for TSV110 Spectre-BHB mitigation The TSV110 processor is vulnerable to the Spectre-BHB (Branch History Buffer) attack, which can be exploited to leak information through branch prediction side channels. This commit adds the MIDR of TSV110 to the list for software mitigation.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-43261 since 05/01/2026. The exploitation is known to be easy. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 06/27/2026).

The vulnerability scanner Nessus provides a plugin with the ID 323086 (SUSE SLED15: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:2482-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.16 or 6.19.6 eliminates this vulnerability. Applying the patch 598c11dd4f4a9de31d854fcb9702f54c1c70f0d0/a8d0ad5d990b050a6db74218a34b5529085e16b8/cccf96c49f61e47d9332d6a4d1c7fe9a2df44440/fd7e360845d331f542854d552469544182e61134/5dbe1f14359735fa50ba0dd4a496125b5bc7f422/fd51d47fcacec3ca027eb65d8c44853d3b6cea95/ad0c356cae164ed5dbd1f4cfd438e46faa5292cb/e3baa5d4b361276efeb87b20d8beced451a7dbd5 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (323086). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
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: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 323086
Nessus Name: SUSE SLED15: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:2482-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.252/5.15.202/6.1.165/6.6.128/6.12.75/6.18.16/6.19.6
Patch: 598c11dd4f4a9de31d854fcb9702f54c1c70f0d0/a8d0ad5d990b050a6db74218a34b5529085e16b8/cccf96c49f61e47d9332d6a4d1c7fe9a2df44440/fd7e360845d331f542854d552469544182e61134/5dbe1f14359735fa50ba0dd4a496125b5bc7f422/fd51d47fcacec3ca027eb65d8c44853d3b6cea95/ad0c356cae164ed5dbd1f4cfd438e46faa5292cb/e3baa5d4b361276efeb87b20d8beced451a7dbd5

Timelineinfo

05/01/2026 CVE reserved
05/06/2026 +5 days Advisory disclosed
05/06/2026 +0 days VulDB entry created
06/27/2026 +52 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43261 (🔒)
GCVE (CVE): GCVE-0-2026-43261
GCVE (VulDB): GCVE-100-361481

Entryinfo

Created: 05/06/2026 16:54
Updated: 06/27/2026 15:46
Changes: 05/06/2026 16:54 (58), 06/27/2026 15:46 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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