netfilter: x_tables: avoid leaking percpu counter pointers

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Summary

CVECVE-2026-53219
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:39 UTC
Updated2026-07-02 20:52:20 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: avoid leaking percpu counter pointers The native and compat get-entries paths copy the fixed rule entry header from the kernelized rule blob to userspace before overwriting the entry's counter fields with a sanitized counter snapshot. On SMP kernels, entry->counters.pcnt contains the percpu allocation address used by x_tables rule counters. A caller can provide a userspace buffer that faults during the initial fixed-header copy after pcnt has been copied but before the later sanitized counter copy runs. The syscall then returns -EFAULT while leaving the raw percpu pointer in userspace. Copy only the fixed entry prefix before counters from the kernelized rule blob, then copy the sanitized counter snapshot into the counter field. Apply this ordering to the IPv4, IPv6, and ARP native and compat get-entries implementations so a fault cannot expose the internal percpu counter pointer.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.001280000 probability, percentile 0.027880000 (date 2026-07-04)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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 71ae0dff02d756e4d2ca710b79f2ff5390029a5f b74ba3343eb44b2cbf7e9665918c287df1d52ebb git Not specified
CNA Linux Linux affected 71ae0dff02d756e4d2ca710b79f2ff5390029a5f 0b35dc8527ccc16b7dc34e8a3164313e68cd4e45 git Not specified
CNA Linux Linux affected 71ae0dff02d756e4d2ca710b79f2ff5390029a5f b28e2fcad3db7e8687b15bc20bced26b5b7c920e git Not specified
CNA Linux Linux affected 71ae0dff02d756e4d2ca710b79f2ff5390029a5f a0d16941adf3a501956d74aefd8d6e217906e79c git Not specified
CNA Linux Linux affected 71ae0dff02d756e4d2ca710b79f2ff5390029a5f 8d67e42ad3b1a95a152541015a07110e06992d6c git Not specified
CNA Linux Linux affected 71ae0dff02d756e4d2ca710b79f2ff5390029a5f 08a3e218064db11f154ad9ad5541751ea7f34ebe git Not specified
CNA Linux Linux affected 71ae0dff02d756e4d2ca710b79f2ff5390029a5f fb0521aff1e10e300d89725cc439d3ea74c828c5 git Not specified
CNA Linux Linux affected 71ae0dff02d756e4d2ca710b79f2ff5390029a5f f7f2fbb0e893a0238dc464f8d8c0f5609bec584f git Not specified
CNA Linux Linux affected 4.2 Not specified
CNA Linux Linux unaffected 4.2 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f7f2fbb0e893a0238dc464f8d8c0f5609bec584f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8d67e42ad3b1a95a152541015a07110e06992d6c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b28e2fcad3db7e8687b15bc20bced26b5b7c920e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a0d16941adf3a501956d74aefd8d6e217906e79c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/08a3e218064db11f154ad9ad5541751ea7f34ebe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fb0521aff1e10e300d89725cc439d3ea74c828c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b74ba3343eb44b2cbf7e9665918c287df1d52ebb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0b35dc8527ccc16b7dc34e8a3164313e68cd4e45 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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