Linux Kernel up to 7.3-rc3 cfg80211 net/wireless/util.c cfg80211_classify8021d uninitialized variable

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.60-

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3. It has been classified as very critical. Affected is the function cfg80211_classify8021d of the file net/wireless/util.c of the component cfg80211. The manipulation leads to uninitialized variable. This vulnerability is listed as CVE-2026-98345. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 7.3-rc3. This issue affects the function cfg80211_classify8021d of the file net/wireless/util.c of the component cfg80211. The manipulation with an unknown input leads to a uninitialized variable vulnerability. Using CWE to declare the problem leads to CWE-457. The code uses a variable that has not been initialized, leading to unpredictable or unintended results. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: check IP header size in cfg80211_classify8021d() A frame that looks like IP can be transmitted, but be too short, so the DS field is read incorrectly: BUG: KMSAN: uninit-value in cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027 cfg80211_classify8021d+0x99d/0x12b0 net/wireless/util.c:1027 ieee80211_select_queue+0x37a/0x9e0 net/mac80211/wme.c:180 __ieee80211_subif_start_xmit+0x60f/0x1d90 net/mac80211/tx.c:4304 ieee80211_subif_start_xmit+0xa8/0x6d0 net/mac80211/tx.c:4538 ... packet_sendmsg+0x9173/0xa2a0 net/packet/af_packet.c:3108 Use skb_header_pointer() like the MPLS case.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-98345 since 09/25/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. 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 5.10.271, 5.15.222, 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 18d5547327c202cda33ad2bbd203220c2c62c8a7/3ff17ffa8d02e0e3f6b2f6e57af4aac511f5b734/c4fbcf1e614ef0755fcc751fdfca21b0bf4e0ef7/12c0abd4d1c1b04a7663d04ba85268bc9ad9c017/f33ad4e2f846e55cf4637419268f093ac9f1a765/a2cdb4a675ca04c4ac8cc962848082d8ce065008/65893c8d28f239c7ddad5a83683be193a9133e9b/48b2c5c628b09cf36cbeca53e0432fc2a7518be7 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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: Uninitialized variable
CWE: CWE-457 / CWE-453
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 5.10.271/5.15.222/6.1.189/6.6.158/6.12.112/6.18.54/7.2.8/7.3-rc4
Patch: 18d5547327c202cda33ad2bbd203220c2c62c8a7/3ff17ffa8d02e0e3f6b2f6e57af4aac511f5b734/c4fbcf1e614ef0755fcc751fdfca21b0bf4e0ef7/12c0abd4d1c1b04a7663d04ba85268bc9ad9c017/f33ad4e2f846e55cf4637419268f093ac9f1a765/a2cdb4a675ca04c4ac8cc962848082d8ce065008/65893c8d28f239c7ddad5a83683be193a9133e9b/48b2c5c628b09cf36cbeca53e0432fc2a7518be7

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-2026-98345 (🔒)
GCVE (CVE): GCVE-0-2026-98345
GCVE (VulDB): GCVE-100-414083

Entryinfo

Created: 10/06/2026 12:37
Changes: 10/06/2026 12:37 (60)
Complete: 🔍
Cache ID: 216::103

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