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7.1
HIGH CVSS 3.1
CVE-2026-53076
bpf: Fix OOB in pcpu_init_value
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix OOB in pcpu_init_value An out-of-bounds read occurs when copying element from a BPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the same value_size that is not rounded up to 8 bytes. The issue happens when: 1. A CGROUP_STORAGE map is created with value_size not aligned to 8 bytes (e.g., 4 bytes) 2. A pcpu map is created with the same value_size (e.g., 4 bytes) 3. Update element in 2 with data in 1 pcpu_init_value assumes that all sources are rounded up to 8 bytes, and invokes copy_map_value_long to make a data copy, However, the assumption doesn't stand since there are some cases where the source may not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data. the verifier verifies exactly the size that the source claims, not the size rounded up to 8 bytes by kernel, an OOB happens when the source has only 4 bytes while the copy size(4) is rounded up to 8.

Details
INFO

Published Date :

June 24, 2026, 5:17 p.m.

Last Modified :

July 21, 2026, 6:14 p.m.

Remotely Exploit :

No

Source :

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

The following products are affected by CVE-2026-53076 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
Apply Linux kernel updates to fix an out-of-bounds read in bpf pcpu_init_value.
  • Update the Linux kernel to the latest version.
  • Apply the specific patch for bpf pcpu_init_value.
  • Reboot systems after applying updates.
  • Verify patch application and system stability.
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-2026-53076.

URL Resource
https://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36 Patch
https://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c Patch
https://git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894c Patch
https://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e Patch
https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9 Patch
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-53076 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-2026-53076 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-2026-53076 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-2026-53076 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.

  • Initial Analysis by [email protected]

    Jul. 21, 2026

    Action Type Old Value New Value
    Added CWE CWE-125
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.10:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.10:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.10:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.10:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.10:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.9.9 up to (excluding) 5.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.91 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.33 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.10.1 up to (excluding) 6.6.141 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.4.78 up to (excluding) 5.5
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894c Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9 Types: Patch
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jun. 28, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jun. 24, 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': 'd3bec0138bfbe58606fc1d6f57a4cdc1a20218db', 'lessThan': 'e19c5ed9f1922a6854073f8651a63fa7be26e9e9', 'versionType': 'git'}, {'status': 'affected', 'version': 'd3bec0138bfbe58606fc1d6f57a4cdc1a20218db', 'lessThan': 'e0378419b0e20178b5d100b27c9cc7e51064202e', 'versionType': 'git'}, {'status': 'affected', 'version': 'd3bec0138bfbe58606fc1d6f57a4cdc1a20218db', 'lessThan': '6086079e6d1c32ba4c4b422612b8aebb1129a96c', 'versionType': 'git'}, {'status': 'affected', 'version': 'd3bec0138bfbe58606fc1d6f57a4cdc1a20218db', 'lessThan': '634a793d0e1c822412095d25a1338f8831ad894c', 'versionType': 'git'}, {'status': 'affected', 'version': 'd3bec0138bfbe58606fc1d6f57a4cdc1a20218db', 'lessThan': '576afddfee8d1108ee299bf10f581593540d1a36', 'versionType': 'git'}, {'status': 'affected', 'version': 'c602ad2b52dcbca5af08e5137bd5575c039b52e3', 'versionType': 'git'}, {'status': 'affected', 'version': 'ab68b940dd6f7b5f8e2557937162dcb8a0583a05', 'versionType': 'git'}, {'status': 'affected', 'version': '5.4.78', 'lessThan': '5.5', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.9.9', 'lessThan': '5.10', 'versionType': 'semver'}], 'programFiles': ['kernel/bpf/hashtab.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.10'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.10', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.141', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.91', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.33', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.10', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['kernel/bpf/hashtab.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: bpf: Fix OOB in pcpu_init_value An out-of-bounds read occurs when copying element from a BPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the same value_size that is not rounded up to 8 bytes. The issue happens when: 1. A CGROUP_STORAGE map is created with value_size not aligned to 8 bytes (e.g., 4 bytes) 2. A pcpu map is created with the same value_size (e.g., 4 bytes) 3. Update element in 2 with data in 1 pcpu_init_value assumes that all sources are rounded up to 8 bytes, and invokes copy_map_value_long to make a data copy, However, the assumption doesn't stand since there are some cases where the source may not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data. the verifier verifies exactly the size that the source claims, not the size rounded up to 8 bytes by kernel, an OOB happens when the source has only 4 bytes while the copy size(4) is rounded up to 8.
    Added Reference https://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36
    Added Reference https://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c
    Added Reference https://git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894c
    Added Reference https://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e
    Added Reference https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9
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: 7.1
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact