CVE-2026-64018
net: mana: validate rx_req_idx to prevent out-of-bounds array access
Description
In the Linux kernel, the following vulnerability has been resolved: net: mana: validate rx_req_idx to prevent out-of-bounds array access In mana_hwc_rx_event_handler(), rx_req_idx is derived from sge->address in DMA-coherent memory. In Confidential VMs (SEV-SNP/TDX), this memory is shared unencrypted and HW can modify WQE contents at any time. No bounds check exists on rx_req_idx, which can lead to an out-of-bounds access into reqs[]. Add bounds check on rx_req_idx in mana_hwc_rx_event_handler() before using it to index the reqs[] array.
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 30, 2026, 2:59 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Add bounds check for rx_req_idx.
- Ensure reqs[] array access is safe.
- Update the Linux kernel to the patched version.
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-2026-64018.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64018 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-2026-64018
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-2026-64018 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64018 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.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 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': 'ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f', 'lessThan': '5ddc715324badd7f2641bc177db1d027b402adae', 'versionType': 'git'}, {'status': 'affected', 'version': 'ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f', 'lessThan': 'ff1d5af207bcea857d45fe81505f1bc4b29eaef0', 'versionType': 'git'}, {'status': 'affected', 'version': 'ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f', 'lessThan': '01f7f893d5e1baae995beeb86cd0f3e6bb2a3b01', 'versionType': 'git'}, {'status': 'affected', 'version': 'ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f', 'lessThan': '763a372d344fb12fae566d36ddb46e92454ad58c', 'versionType': 'git'}, {'status': 'affected', 'version': 'ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f', 'lessThan': 'fa627a5eaa83fc0261f44ef3769693b886ca6e27', 'versionType': 'git'}, {'status': 'affected', 'version': 'ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f', 'lessThan': '355e9f2b2a7887ca38100127989af3e422ba71d0', 'versionType': 'git'}, {'status': 'affected', 'version': 'ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f', 'lessThan': 'b809d0409991b75a6cff846a5ac27c3062953f84', 'versionType': 'git'}], 'programFiles': ['drivers/net/ethernet/microsoft/mana/hw_channel.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.13'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.13', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.209', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.142', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.92', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/ethernet/microsoft/mana/hw_channel.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: net: mana: validate rx_req_idx to prevent out-of-bounds array access In mana_hwc_rx_event_handler(), rx_req_idx is derived from sge->address in DMA-coherent memory. In Confidential VMs (SEV-SNP/TDX), this memory is shared unencrypted and HW can modify WQE contents at any time. No bounds check exists on rx_req_idx, which can lead to an out-of-bounds access into reqs[]. Add bounds check on rx_req_idx in mana_hwc_rx_event_handler() before using it to index the reqs[] array. Added Reference https://git.kernel.org/stable/c/01f7f893d5e1baae995beeb86cd0f3e6bb2a3b01 Added Reference https://git.kernel.org/stable/c/355e9f2b2a7887ca38100127989af3e422ba71d0 Added Reference https://git.kernel.org/stable/c/5ddc715324badd7f2641bc177db1d027b402adae Added Reference https://git.kernel.org/stable/c/763a372d344fb12fae566d36ddb46e92454ad58c Added Reference https://git.kernel.org/stable/c/b809d0409991b75a6cff846a5ac27c3062953f84 Added Reference https://git.kernel.org/stable/c/fa627a5eaa83fc0261f44ef3769693b886ca6e27 Added Reference https://git.kernel.org/stable/c/ff1d5af207bcea857d45fe81505f1bc4b29eaef0