CVE-2026-43113
Undergoing Analysis Undergoing Analysis - In Progress
Buffer Overflow in Linux Kernel WiFi Driver

Publication date: 2026-05-06

Last updated on: 2026-06-01

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: wifi: wl1251: validate packet IDs before indexing tx_frames wl1251_tx_packet_cb() uses the firmware completion ID directly to index the fixed 16-entry wl->tx_frames[] array. The ID is a raw u8 from the completion block, and the callback does not currently verify that it fits the array before dereferencing it. Reject completion IDs that fall outside wl->tx_frames[] and keep the existing NULL check in the same guard. This keeps the fix local to the trust boundary and avoids touching the rest of the completion flow.
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Meta Information
Published
2026-05-06
Last Modified
2026-06-01
Generated
2026-06-16
AI Q&A
2026-05-07
EPSS Evaluated
2026-06-14
NVD
CVE-2026-43113
EUVD
EUVD-2026-27635
Affected Vendors & Products
Showing 10 associated CPEs
Vendor Product Version / Range
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel From 6.13 (inc) to 6.18.24 (exc)
linux linux_kernel From 6.19 (inc) to 6.19.14 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.83 (exc)
linux linux_kernel From 2.6.31 (inc) to 6.6.136 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
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Mitigation Strategies

The vulnerability has been resolved by validating packet IDs before indexing the tx_frames array in the Linux kernel wifi wl1251 driver. To mitigate this vulnerability, you should update your Linux kernel to a version that includes this fix.

Executive Summary

This vulnerability exists in the Linux kernel's wifi driver for the wl1251 device. Specifically, the function wl1251_tx_packet_cb() uses a firmware completion ID to index into a fixed-size array of 16 entries called tx_frames[]. The completion ID is an unsigned 8-bit value obtained from the firmware, but the function does not verify whether this ID is within the valid range of the array before using it as an index.

Because the ID is not validated, it could lead to out-of-bounds access when indexing the tx_frames[] array. The fix involves rejecting any completion IDs that fall outside the valid range of the array, thereby preventing invalid memory access and maintaining the integrity of the completion flow.

Impact Analysis

This vulnerability can lead to out-of-bounds memory access in the Linux kernel's wifi driver. Such memory access issues can cause system instability, crashes, or potentially allow an attacker to execute arbitrary code or cause denial of service by exploiting the unchecked indexing.

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