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9.8
CRITICAL CVSS 3.1
CVE-2026-72217
SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing xdr_buf_to_bvec() writes a bio_vec into the caller's array before testing whether that slot is in range, and the head branch performs the store with no check at all. When the caller's budget is exactly used up, the next store lands one element past the end of the array. The overflow label returns count - 1, which masks the surplus store but cannot undo it. rq_bvec, the array passed by nfsd_vfs_write(), is allocated to exactly rq_maxpages entries with no slack. The OOB store can land in adjacent slab memory; the bv_len and bv_offset fields written there are derived from client-supplied RPC payload sizes. Move the in-range check ahead of the store in the head, page-loop, and tail branches. With the check at the top of each sequence, count is incremented only after a successful store, so the overflow label can return count directly.

Details
INFO

Published Date :

Aug. 15, 2026, 6:21 a.m.

Last Modified :

Aug. 17, 2026, 6:18 a.m.

Remotely Exploit :

Yes !

Source :

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

The following products are affected by CVE-2026-72217 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.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 CRITICAL 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Apply Linux kernel patch to fix out-of-bounds write in xdr_buf_to_bvec.
  • Update the Linux kernel to the latest patched version.
  • Verify the integrity of the kernel modules.
  • Reboot the system to apply kernel changes.
  • Monitor system logs for any related errors.
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-2026-72217.

URL Resource
https://git.kernel.org/stable/c/42f5b80dda6b86e424054baf1475df686c403d5c
https://git.kernel.org/stable/c/4a1148f2739d5089c3ca8ae2e9d1053e219ab5df
https://git.kernel.org/stable/c/6029e711a818bf34d6c4b90cafee24f3afffa110
https://git.kernel.org/stable/c/69e18135e2a004a79505451dbef07314ea16e1eb
https://git.kernel.org/stable/c/98414b42530af65cb984ffc12685096a3b5e179a
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-72217 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-2026-72217 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-2026-72217 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-2026-72217 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

    Aug. 17, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '4a1148f2739d5089c3ca8ae2e9d1053e219ab5df', 'versionType': 'git'}, {'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '6029e711a818bf34d6c4b90cafee24f3afffa110', 'versionType': 'git'}, {'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '69e18135e2a004a79505451dbef07314ea16e1eb', 'versionType': 'git'}, {'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '98414b42530af65cb984ffc12685096a3b5e179a', 'versionType': 'git'}, {'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '42f5b80dda6b86e424054baf1475df686c403d5c', 'versionType': 'git'}], 'programFiles': ['net/sunrpc/xdr.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.6'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.6', '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/sunrpc/xdr.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '4a1148f2739d5089c3ca8ae2e9d1053e219ab5df', 'versionType': 'git'}, {'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '6029e711a818bf34d6c4b90cafee24f3afffa110', 'versionType': 'git'}, {'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '69e18135e2a004a79505451dbef07314ea16e1eb', 'versionType': 'git'}, {'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '98414b42530af65cb984ffc12685096a3b5e179a', 'versionType': 'git'}, {'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '42f5b80dda6b86e424054baf1475df686c403d5c', 'versionType': 'git'}], 'programFiles': ['net/sunrpc/xdr.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.6'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.6', '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', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/sunrpc/xdr.c'], 'defaultStatus': 'affected'}]
  • 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': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '4a1148f2739d5089c3ca8ae2e9d1053e219ab5df', 'versionType': 'git'}, {'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '6029e711a818bf34d6c4b90cafee24f3afffa110', 'versionType': 'git'}, {'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '69e18135e2a004a79505451dbef07314ea16e1eb', 'versionType': 'git'}, {'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '98414b42530af65cb984ffc12685096a3b5e179a', 'versionType': 'git'}, {'status': 'affected', 'version': '2eb2b93581813b74c7174961126f6ec38eadb5a7', 'lessThan': '42f5b80dda6b86e424054baf1475df686c403d5c', 'versionType': 'git'}], 'programFiles': ['net/sunrpc/xdr.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.6'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.6', '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/sunrpc/xdr.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing xdr_buf_to_bvec() writes a bio_vec into the caller's array before testing whether that slot is in range, and the head branch performs the store with no check at all. When the caller's budget is exactly used up, the next store lands one element past the end of the array. The overflow label returns count - 1, which masks the surplus store but cannot undo it. rq_bvec, the array passed by nfsd_vfs_write(), is allocated to exactly rq_maxpages entries with no slack. The OOB store can land in adjacent slab memory; the bv_len and bv_offset fields written there are derived from client-supplied RPC payload sizes. Move the in-range check ahead of the store in the head, page-loop, and tail branches. With the check at the top of each sequence, count is incremented only after a successful store, so the overflow label can return count directly.
    Added Reference https://git.kernel.org/stable/c/42f5b80dda6b86e424054baf1475df686c403d5c
    Added Reference https://git.kernel.org/stable/c/4a1148f2739d5089c3ca8ae2e9d1053e219ab5df
    Added Reference https://git.kernel.org/stable/c/6029e711a818bf34d6c4b90cafee24f3afffa110
    Added Reference https://git.kernel.org/stable/c/69e18135e2a004a79505451dbef07314ea16e1eb
    Added Reference https://git.kernel.org/stable/c/98414b42530af65cb984ffc12685096a3b5e179a
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
Base CVSS Score: 9.8
Attack Vector
Attack Complexity
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Scope
Confidentiality Impact
Integrity Impact
Availability Impact