bpf: Fix OOB in pcpu_init_value

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53076
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:21 UTC
Updated2026-07-21 18:14:03 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.001160000 probability, percentile 0.019250000 (date 2026-07-14)

Problem Types: CWE-125

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d3bec0138bfbe58606fc1d6f57a4cdc1a20218db e19c5ed9f1922a6854073f8651a63fa7be26e9e9 git Not specified
CNA Linux Linux affected d3bec0138bfbe58606fc1d6f57a4cdc1a20218db e0378419b0e20178b5d100b27c9cc7e51064202e git Not specified
CNA Linux Linux affected d3bec0138bfbe58606fc1d6f57a4cdc1a20218db 6086079e6d1c32ba4c4b422612b8aebb1129a96c git Not specified
CNA Linux Linux affected d3bec0138bfbe58606fc1d6f57a4cdc1a20218db 634a793d0e1c822412095d25a1338f8831ad894c git Not specified
CNA Linux Linux affected d3bec0138bfbe58606fc1d6f57a4cdc1a20218db 576afddfee8d1108ee299bf10f581593540d1a36 git Not specified
CNA Linux Linux affected c602ad2b52dcbca5af08e5137bd5575c039b52e3 git Not specified
CNA Linux Linux affected ab68b940dd6f7b5f8e2557937162dcb8a0583a05 git Not specified
CNA Linux Linux affected 5.4.78 5.5 semver Not specified
CNA Linux Linux affected 5.9.9 5.10 semver Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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