Linux Kernel up to 7.3-rc3 Bluetooth Codec Parser skb_pull_data num out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.27

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3. It has been classified as very critical. The impacted element is the function skb_pull_data of the component Bluetooth Codec Parser. This manipulation of the argument num causes out-of-bounds. This vulnerability appears as CVE-2026-98247. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3. It has been declared as very critical. Affected by this vulnerability is the function skb_pull_data of the component Bluetooth Codec Parser. The manipulation of the argument num with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_codec: validate vendor codec count length The Read Local Supported Codecs parsers consume the variable-sized standard codec array before parsing the vendor codec count. Although the initial reply-size check includes a vendor count byte in the fixed layout, it does not guarantee that the byte remains after the standard codec array. If a controller reply ends immediately after that array, calculating the vendor codec array size reads vnd_codecs->num beyond the skb data. Use skb_pull_data() to validate and consume each codec header before using its count in both command variants.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-98247 since 09/25/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/06/2026).

Upgrading to version 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8 or 7.3-rc4 eliminates this vulnerability. Applying the patch 9c04b9a4d08b95dee901d24b7607c4cbd65fa0a8/a6da782fefae611e68a1aa79644065fc8ca5abcd/e4cfd3c4299105237458b27958bd7b0aa4c60795/f49a543d76d48f184b34225d9c0e2fc4cbdea8ec/12a82819b0cada6e304790b1097f8f9006eb6123/d0795cfd6f655f4de84868a4f4bb41a03f037b3d is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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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 6.1.189/6.6.158/6.12.112/6.18.54/7.2.8/7.3-rc4
Patch: 9c04b9a4d08b95dee901d24b7607c4cbd65fa0a8/a6da782fefae611e68a1aa79644065fc8ca5abcd/e4cfd3c4299105237458b27958bd7b0aa4c60795/f49a543d76d48f184b34225d9c0e2fc4cbdea8ec/12a82819b0cada6e304790b1097f8f9006eb6123/d0795cfd6f655f4de84868a4f4bb41a03f037b3d

Timelineinfo

09/25/2026 CVE reserved
10/06/2026 +11 days Advisory disclosed
10/06/2026 +0 days VulDB entry created
10/06/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98247 (🔒)
GCVE (CVE): GCVE-0-2026-98247
GCVE (VulDB): GCVE-100-414223

Entryinfo

Created: 10/06/2026 13:48
Changes: 10/06/2026 13:48 (60)
Complete: 🔍
Cache ID: 216::103

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