Linux Kernel up to 6.12.104/6.18.45/7.1.9 veth veth_poll allocation of resources

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00+

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.12.104/6.18.45/7.1.9 and classified as critical. The affected element is the function veth_poll of the component veth. This manipulation causes allocation of resources. This vulnerability is tracked as CVE-2026-74742. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.12.104/6.18.45/7.1.9 and classified as critical. Affected by this vulnerability is the function veth_poll of the component veth. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. 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: veth: fix queue index used to wake the peer txq in veth_poll veth_poll() derives the index of the peer TX queue to wake from rq->xdp_rxq.queue_index. That field is only initialized by xdp_rxq_info_reg() in veth_enable_xdp_range(), which runs only when an XDP program is attached. On the plain GRO/NAPI path (veth_napi_enable_range()) xdp_rxq_info_reg() is never called, so queue_index stays 0 for every queue, as priv->rq is zero-allocated. So in a multi-queue setup with GRO enabled and no XDP program attached, every NAPI instance looks at the peer's TX queue 0. If veth_xmit() stops peer TX queue 1 because the ptr_ring is full (NETDEV_TX_BUSY), nothing ever wakes it again: the poller draining queue 1 wakes queue 0 instead. veth implements no ndo_tx_timeout, so the netdev watchdog does not kick in either, and the queue stays stopped indefinitely. Derive the index from the position of the rq within priv->rq instead, which is correct regardless of whether XDP was ever enabled. Scripts to reproduce the stall are available at https://github.com/netoptimizer/veth-backpressure-performance-testing

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-74742 since 08/15/2026. 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 08/26/2026). MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 6.12.105, 6.18.46 or 7.1.10 eliminates this vulnerability. Applying the patch b662a1fb4f3a5ea19bac24eea8315b1d05be51e7/73f8dd22b1e533a99ecc3f9b5de6c6daccaecace/90bb11fb29d3c55a2c46dc7c386d096b286e7fcf/60db47f02bfa2aa688938aa199117ec4f8e31d23 is able to eliminate this problem.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
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: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
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 6.12.105/6.18.46/7.1.10
Patch: b662a1fb4f3a5ea19bac24eea8315b1d05be51e7/73f8dd22b1e533a99ecc3f9b5de6c6daccaecace/90bb11fb29d3c55a2c46dc7c386d096b286e7fcf/60db47f02bfa2aa688938aa199117ec4f8e31d23

Timelineinfo

08/15/2026 CVE reserved
08/26/2026 +11 days Advisory disclosed
08/26/2026 +0 days VulDB entry created
08/26/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74742 (🔒)
GCVE (CVE): GCVE-0-2026-74742
GCVE (VulDB): GCVE-100-395797

Entryinfo

Created: 08/26/2026 17:00
Changes: 08/26/2026 17:00 (59)
Complete: 🔍
Cache ID: 216::103

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