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CVE-2026-74435
rxrpc: rxrpc_verify_data ensure rx_dec_buffer alloc
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: rxrpc_verify_data ensure rx_dec_buffer alloc rxrpc_recvmsg_data() calls rxrpc_verify_data() whenever the rxrpc_call.rx_dec_buffer is unallocated and assumes that upon successful return that rx_dec_buffer must be allocated. However, rxrpc_verify_data() does not request an allocation if the rxrpc_skb_priv.len is zero. In addition, failure to allocate rx_dec_buffer will result in a call to skb_copy_bits() with a NULL destination which can trigger a NULL pointer dereference. To prevent these issues rxrpc_verify_data() is modified to always attempt to allocate the rxrpc_call.rx_dec_buffer if it is NULL. This issue was identified with assistance of a private sashiko instance.

Details
INFO

Published Date :

Aug. 15, 2026, 6:22 a.m.

Last Modified :

Aug. 15, 2026, 6:22 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-74435 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

No affected product recoded yet

: Total Affected Vendor : 0 | Products : 0
Solution
Address NULL pointer dereference by ensuring buffer allocation in rxrpc_verify_data.
  • Ensure rxrpc_call.rx_dec_buffer is allocated.
  • Request allocation if rxrpc_call.rx_dec_buffer is NULL.
  • Avoid calling skb_copy_bits with a NULL destination.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-74435.

URL Resource
https://git.kernel.org/stable/c/16c8ae9735c5bd7e54dd7478d6348e0fc860842d
https://git.kernel.org/stable/c/6563b4eb38c35d75892445bcf8aacdc29914821c
https://git.kernel.org/stable/c/8bbede0afced346b24e4fbde0c68cf12980ba948
https://git.kernel.org/stable/c/a962bc8508592c4d51092edac68579bd8b18fe44
https://git.kernel.org/stable/c/d3b642cf95d48234590cc91450d8705a9bf6b540
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-74435 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-74435 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-74435 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-74435 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 15, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'a05bf6d9e621fa71e89ccebe3047ba45218d7b38', 'lessThan': '8bbede0afced346b24e4fbde0c68cf12980ba948', 'versionType': 'git'}, {'status': 'affected', 'version': 'b94a6ccbaf1104dd980150a65fdeb2f69d17d2f5', 'lessThan': '6563b4eb38c35d75892445bcf8aacdc29914821c', 'versionType': 'git'}, {'status': 'affected', 'version': '46cb765e2e5ad52303ea157e10d370bb6b7acbbf', 'lessThan': 'd3b642cf95d48234590cc91450d8705a9bf6b540', 'versionType': 'git'}, {'status': 'affected', 'version': 'd2bc90cf6c75cb96d2ce549be6c35efa3099d25b', 'lessThan': 'a962bc8508592c4d51092edac68579bd8b18fe44', 'versionType': 'git'}, {'status': 'affected', 'version': 'd2bc90cf6c75cb96d2ce549be6c35efa3099d25b', 'lessThan': '16c8ae9735c5bd7e54dd7478d6348e0fc860842d', 'versionType': 'git'}, {'status': 'affected', 'version': 'c580087743712112778a06d65a4074053072d7bf', 'versionType': 'git'}, {'status': 'affected', 'version': '6.6.143', 'lessThan': '6.6.145', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.93', 'lessThan': '6.12.97', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.18.35', 'lessThan': '6.18.40', 'versionType': 'semver'}, {'status': 'affected', 'version': '7.0.11', 'lessThan': '7.1', 'versionType': 'semver'}], 'programFiles': ['net/rxrpc/recvmsg.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '7.1'}, {'status': 'unaffected', 'version': '0', 'lessThan': '7.1', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/rxrpc/recvmsg.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: rxrpc: rxrpc_verify_data ensure rx_dec_buffer alloc rxrpc_recvmsg_data() calls rxrpc_verify_data() whenever the rxrpc_call.rx_dec_buffer is unallocated and assumes that upon successful return that rx_dec_buffer must be allocated. However, rxrpc_verify_data() does not request an allocation if the rxrpc_skb_priv.len is zero. In addition, failure to allocate rx_dec_buffer will result in a call to skb_copy_bits() with a NULL destination which can trigger a NULL pointer dereference. To prevent these issues rxrpc_verify_data() is modified to always attempt to allocate the rxrpc_call.rx_dec_buffer if it is NULL. This issue was identified with assistance of a private sashiko instance.
    Added Reference https://git.kernel.org/stable/c/16c8ae9735c5bd7e54dd7478d6348e0fc860842d
    Added Reference https://git.kernel.org/stable/c/6563b4eb38c35d75892445bcf8aacdc29914821c
    Added Reference https://git.kernel.org/stable/c/8bbede0afced346b24e4fbde0c68cf12980ba948
    Added Reference https://git.kernel.org/stable/c/a962bc8508592c4d51092edac68579bd8b18fe44
    Added Reference https://git.kernel.org/stable/c/d3b642cf95d48234590cc91450d8705a9bf6b540
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
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