Linux Kernel up to 7.3-rc3 net/packet net/packet/af_packet.c tpacket_rcv race condition

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 7.3-rc3. This issue affects the function tpacket_rcv of the file net/packet/af_packet.c of the component net/packet. This manipulation causes race condition. This vulnerability is handled as CVE-2026-98233. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 7.3-rc3 and classified as very critical. Affected by this vulnerability is the function tpacket_rcv of the file net/packet/af_packet.c of the component net/packet. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. 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: net/packet: clear RX owner on VNET header error Commit 61fad6816fc1 ("net/packet: tpacket_rcv: avoid a producer race condition") added rx_owner_map and made tpacket_rcv() claim a V1 or V2 ring slot before converting the virtio-net header. If the conversion fails, the drop path leaves the slot claimed. With a one-frame TPACKET_V2 ring, an unsupported UDP GSO packet leaves the only slot unavailable, so the ring also drops the next valid packet. Clear the ownership bit on this error path. TPACKET_V3 already clears its block state here.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-98233 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 are known, but no exploit is available. The price 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 bb10a0084c03a94364aeec542beddc5d49b59f59/b8c0cb3069058c2d67b5c7c833b2833381ecffdc/2daa618e7ff19eefcbda281bc4c5998c4140f9cf/23cd30498891d29a69ec9b75bd92f8a0f21f1342/49a48a5aaf85fe69d2dc3fb334b4854fadf44e39/805edbdcb8681da5f7ee43b3c3c809f7a8c31208/693209a237fc548791cf402441db8b68d1da7d38/33ff111d7ba3beb86e28938d6382bb5beabd865a 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: Race condition
CWE: CWE-362
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: bb10a0084c03a94364aeec542beddc5d49b59f59/b8c0cb3069058c2d67b5c7c833b2833381ecffdc/2daa618e7ff19eefcbda281bc4c5998c4140f9cf/23cd30498891d29a69ec9b75bd92f8a0f21f1342/49a48a5aaf85fe69d2dc3fb334b4854fadf44e39/805edbdcb8681da5f7ee43b3c3c809f7a8c31208/693209a237fc548791cf402441db8b68d1da7d38/33ff111d7ba3beb86e28938d6382bb5beabd865a

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-2026-98233 (🔒)
GCVE (CVE): GCVE-0-2026-98233
GCVE (VulDB): GCVE-100-414121

Entryinfo

Created: 10/06/2026 12:57
Changes: 10/06/2026 12:57 (60)
Complete: 🔍
Cache ID: 216::103

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

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