1. Home
  2. Vulnerabilities
  3. CVE-2026-72157
8.8
HIGH CVSS 3.1
CVE-2026-72157
net: thunderbolt: Fix frags[] overflow by bounding frame_count
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: net: thunderbolt: Fix frags[] overflow by bounding frame_count tbnet_poll() assembles a multi-frame ThunderboltIP packet into one skb. The first frame goes into the skb linear area and every further frame is added as a page fragment. skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, hdr_size, frame_size, TBNET_RX_PAGE_SIZE - hdr_size); A packet of frame_count frames therefore ends up with frame_count - 1 fragments. tbnet_check_frame() only bounds the peer supplied frame_count to TBNET_RING_SIZE / 4 (64), which is far above MAX_SKB_FRAGS (17 by default). A peer that sends a packet of 19 or more small frames pushes nr_frags past MAX_SKB_FRAGS, so skb_add_rx_frag() writes past skb_shinfo()->frags[] and corrupts memory after the shared info. Tighten the start of packet bound to MAX_SKB_FRAGS + 1 so a packet can never produce more fragments than frags[] can hold. This matches the recent skb frags overflow fixes in other receive paths, for example f0813bcd2d9d ("net: wwan: t7xx: fix potential skb->frags overflow in RX path") and 600dc40554dc ("net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()").

Details
INFO

Published Date :

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

Last Modified :

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

Remotely Exploit :

No

Source :

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

The following products are affected by CVE-2026-72157 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 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Limit frame count to prevent skb frags array overflow and memory corruption.
  • Apply the patch to bound frame_count to MAX_SKB_FRAGS + 1.
  • Update the Linux kernel to the latest patched version.
  • Review and apply similar fixes to other network drivers.
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-2026-72157.

URL Resource
https://git.kernel.org/stable/c/2b3b4e5ff5a58ad32817824b0310e63908b12052
https://git.kernel.org/stable/c/55d9895f89970501fe126d1026b586b04a224c27
https://git.kernel.org/stable/c/e27beb4536cbf1d59e2d8c2840e87d972aba906f
https://git.kernel.org/stable/c/e5824d5b841d99a2bcdd4e2c256643293bbc22c1
https://git.kernel.org/stable/c/fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-72157 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-2026-72157 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-2026-72157 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-2026-72157 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:A/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': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': '2b3b4e5ff5a58ad32817824b0310e63908b12052', 'versionType': 'git'}, {'status': 'affected', 'version': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': 'e27beb4536cbf1d59e2d8c2840e87d972aba906f', 'versionType': 'git'}, {'status': 'affected', 'version': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': 'e5824d5b841d99a2bcdd4e2c256643293bbc22c1', 'versionType': 'git'}, {'status': 'affected', 'version': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': 'fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3', 'versionType': 'git'}, {'status': 'affected', 'version': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': '55d9895f89970501fe126d1026b586b04a224c27', 'versionType': 'git'}], 'programFiles': ['drivers/net/thunderbolt/main.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.15'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.15', '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': ['drivers/net/thunderbolt/main.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': '2b3b4e5ff5a58ad32817824b0310e63908b12052', 'versionType': 'git'}, {'status': 'affected', 'version': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': 'e27beb4536cbf1d59e2d8c2840e87d972aba906f', 'versionType': 'git'}, {'status': 'affected', 'version': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': 'e5824d5b841d99a2bcdd4e2c256643293bbc22c1', 'versionType': 'git'}, {'status': 'affected', 'version': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': 'fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3', 'versionType': 'git'}, {'status': 'affected', 'version': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': '55d9895f89970501fe126d1026b586b04a224c27', 'versionType': 'git'}], 'programFiles': ['drivers/net/thunderbolt/main.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.15'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.15', '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': ['drivers/net/thunderbolt/main.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': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': '2b3b4e5ff5a58ad32817824b0310e63908b12052', 'versionType': 'git'}, {'status': 'affected', 'version': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': 'e27beb4536cbf1d59e2d8c2840e87d972aba906f', 'versionType': 'git'}, {'status': 'affected', 'version': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': 'e5824d5b841d99a2bcdd4e2c256643293bbc22c1', 'versionType': 'git'}, {'status': 'affected', 'version': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': 'fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3', 'versionType': 'git'}, {'status': 'affected', 'version': 'e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e', 'lessThan': '55d9895f89970501fe126d1026b586b04a224c27', 'versionType': 'git'}], 'programFiles': ['drivers/net/thunderbolt/main.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.15'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.15', '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': ['drivers/net/thunderbolt/main.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: net: thunderbolt: Fix frags[] overflow by bounding frame_count tbnet_poll() assembles a multi-frame ThunderboltIP packet into one skb. The first frame goes into the skb linear area and every further frame is added as a page fragment. skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, hdr_size, frame_size, TBNET_RX_PAGE_SIZE - hdr_size); A packet of frame_count frames therefore ends up with frame_count - 1 fragments. tbnet_check_frame() only bounds the peer supplied frame_count to TBNET_RING_SIZE / 4 (64), which is far above MAX_SKB_FRAGS (17 by default). A peer that sends a packet of 19 or more small frames pushes nr_frags past MAX_SKB_FRAGS, so skb_add_rx_frag() writes past skb_shinfo()->frags[] and corrupts memory after the shared info. Tighten the start of packet bound to MAX_SKB_FRAGS + 1 so a packet can never produce more fragments than frags[] can hold. This matches the recent skb frags overflow fixes in other receive paths, for example f0813bcd2d9d ("net: wwan: t7xx: fix potential skb->frags overflow in RX path") and 600dc40554dc ("net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()").
    Added Reference https://git.kernel.org/stable/c/2b3b4e5ff5a58ad32817824b0310e63908b12052
    Added Reference https://git.kernel.org/stable/c/55d9895f89970501fe126d1026b586b04a224c27
    Added Reference https://git.kernel.org/stable/c/e27beb4536cbf1d59e2d8c2840e87d972aba906f
    Added Reference https://git.kernel.org/stable/c/e5824d5b841d99a2bcdd4e2c256643293bbc22c1
    Added Reference https://git.kernel.org/stable/c/fe6b606fbf0c3beb94ccf17fcf31d8c2138264e3
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: 8.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact