Linux Kernel up to 7.3-rc3 wwan t7xx_ccmni_recv_skb out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.00

Summaryinfo

A vulnerability categorized as very critical has been discovered in Linux Kernel up to 7.3-rc3. The impacted element is the function t7xx_ccmni_recv_skb of the component wwan. Such manipulation leads to out-of-bounds. This vulnerability is uniquely identified as CVE-2026-98238. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3 and classified as very critical. Affected by this issue is the function t7xx_ccmni_recv_skb of the component wwan. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: net: wwan: t7xx: validate the netif index in t7xx_ccmni_recv_skb() The netif index carried in the DPMAIF PIT header is five bits wide, but ccmni_inst[] only has room for NIC_DEV_MAX (21) entries. t7xx_ccmni_recv_skb() indexes the array without a bounds check, so indexes 21 to 31 read past it. The out-of-bounds value lands in the callback table that follows the array, which is never NULL, so the existing !ccmni check does not catch it and the driver dereferences whatever sits there as a struct t7xx_ccmni. Drop the skb when the index is out of range. Verified in a QEMU guest with a fault injector setting the netif index to 25: the unpatched driver reads a value past ccmni_inst[], which lands in the callback table, and dereferences it far enough to queue the skb. With this check the packet is dropped. Well-formed traffic on index 0 is unaffected. Changes in v2: none.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-98238 since 09/25/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. 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 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 7c2fe308bda5a7e6222d7f0c3c311991372baab4/fba45070e25abdae08bcaebfadeef050dc39e208/e1b0609b1a40da03e385be290853a604eb4c3fb9/9dbf13de4edff6fbc1f7ad9c4040326b6ed599ad/d28aa2de9654e8024922775520a2665e00c04ad5/c7ead9704249d57d4693a04697e3bbd285138fa9 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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Version

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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: 7c2fe308bda5a7e6222d7f0c3c311991372baab4/fba45070e25abdae08bcaebfadeef050dc39e208/e1b0609b1a40da03e385be290853a604eb4c3fb9/9dbf13de4edff6fbc1f7ad9c4040326b6ed599ad/d28aa2de9654e8024922775520a2665e00c04ad5/c7ead9704249d57d4693a04697e3bbd285138fa9

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-2026-98238 (🔒)
GCVE (CVE): GCVE-0-2026-98238
GCVE (VulDB): GCVE-100-414212

Entryinfo

Created: 10/06/2026 13:43
Changes: 10/06/2026 13:43 (59)
Complete: 🔍
Cache ID: 216::103

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