Linux Kernel up to 6.3.4 LRO Feature netdev_sync_lower_features stack-based overflow

CVSS Meta Temp Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Linux Kernel up to 5.4.243/5.10.180/5.15.113/6.1.30/6.3.4. This affects the function netdev_sync_lower_features of the component LRO Feature. The manipulation results in stack-based overflow. This vulnerability was named CVE-2023-54012. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.4.243/5.10.180/5.15.113/6.1.30/6.3.4. It has been classified as critical. Affected is the function netdev_sync_lower_features of the component LRO Feature. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: net: fix stack overflow when LRO is disabled for virtual interfaces When the virtual interface's feature is updated, it synchronizes the updated feature for its own lower interface. This propagation logic should be worked as the iteration, not recursively. But it works recursively due to the netdev notification unexpectedly. This problem occurs when it disables LRO only for the team and bonding interface type. team0 | +------+------+-----+-----+ | | | | | team1 team2 team3 ... team200 If team0's LRO feature is updated, it generates the NETDEV_FEAT_CHANGE event to its own lower interfaces(team1 ~ team200). It is worked by netdev_sync_lower_features(). So, the NETDEV_FEAT_CHANGE notification logic of each lower interface work iteratively. But generated NETDEV_FEAT_CHANGE event is also sent to the upper interface too. upper interface(team0) generates the NETDEV_FEAT_CHANGE event for its own lower interfaces again. lower and upper interfaces receive this event and generate this event again and again. So, the stack overflow occurs. But it is not the infinite loop issue. Because the netdev_sync_lower_features() updates features before generating the NETDEV_FEAT_CHANGE event. Already synchronized lower interfaces skip notification logic. So, it is just the problem that iteration logic is changed to the recursive unexpectedly due to the notification mechanism. Reproducer: ip link add team0 type team ethtool -K team0 lro on for i in {1..200} do ip link add team$i master team0 type team ethtool -K team$i lro on done ethtool -K team0 lro off In order to fix it, the notifier_ctx member of bonding/team is introduced.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2023-54012 since 12/24/2025. The exploitability is told to be easy. 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 01/30/2026).

The vulnerability scanner Nessus provides a plugin with the ID 279978 (Linux Distros Unpatched Vulnerability : CVE-2023-54012), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.244, 5.10.181, 5.15.114, 6.1.31 or 6.3.5 eliminates this vulnerability. Applying the patch 9ea0c5f90a27b5b884d880e146e0f65f3052e401/4bb955c4d2830a58c08e2a48ab75d75368e3ff36/cf3b5cd7127cc10c5b12400c545f263f0e5e715c/ed66e6327a69fec95034cda2ac5b6a57b8b3b622/6bf00bb3dc7e5b9fb05488e11616e65d64e975fa/ae9b15fbe63447bc1d3bba3769f409d17ca6fdf6 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (279978) and CERT Bund (WID-SEC-2025-2920). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • SUSE Linux
  • SUSE openSUSE
  • Open Source Linux Kernel

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 279978
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2023-54012

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.4.244/5.10.181/5.15.114/6.1.31/6.3.5
Patch: 9ea0c5f90a27b5b884d880e146e0f65f3052e401/4bb955c4d2830a58c08e2a48ab75d75368e3ff36/cf3b5cd7127cc10c5b12400c545f263f0e5e715c/ed66e6327a69fec95034cda2ac5b6a57b8b3b622/6bf00bb3dc7e5b9fb05488e11616e65d64e975fa/ae9b15fbe63447bc1d3bba3769f409d17ca6fdf6

Timelineinfo

12/24/2025 Advisory disclosed
12/24/2025 +0 days CVE reserved
12/24/2025 +0 days VulDB entry created
01/30/2026 +37 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-54012 (🔒)
GCVE (CVE): GCVE-0-2023-54012
GCVE (VulDB): GCVE-100-338208
CERT Bund: WID-SEC-2025-2920 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 12/24/2025 15:29
Updated: 01/30/2026 07:35
Changes: 12/24/2025 15:29 (59), 12/25/2025 07:02 (7), 12/26/2025 03:41 (2), 01/30/2026 07:35 (1)
Complete: 🔍
Cache ID: 216::103

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