CVE-2026-53219
netfilter: x_tables: avoid leaking percpu counter pointers
Description
In 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.
INFO
Published Date :
June 25, 2026, 9:16 a.m.
Last Modified :
July 2, 2026, 8:52 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Copy fixed entry prefix before counters.
- Copy sanitized counter snapshot into counter field.
- Apply ordering to native and compat implementations.
- Update the Linux kernel.
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-2026-53219.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53219 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-2026-53219
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-2026-53219 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53219 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. 02, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.176 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.143 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.210 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.36 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.94 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.13 *cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.2 up to (excluding) 5.10.259 Added Reference Type kernel.org: https://git.kernel.org/stable/c/08a3e218064db11f154ad9ad5541751ea7f34ebe Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/0b35dc8527ccc16b7dc34e8a3164313e68cd4e45 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8d67e42ad3b1a95a152541015a07110e06992d6c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a0d16941adf3a501956d74aefd8d6e217906e79c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b28e2fcad3db7e8687b15bc20bced26b5b7c920e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b74ba3343eb44b2cbf7e9665918c287df1d52ebb Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/f7f2fbb0e893a0238dc464f8d8c0f5609bec584f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/fb0521aff1e10e300d89725cc439d3ea74c828c5 Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 25, 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': '71ae0dff02d756e4d2ca710b79f2ff5390029a5f', 'lessThan': 'b74ba3343eb44b2cbf7e9665918c287df1d52ebb', 'versionType': 'git'}, {'status': 'affected', 'version': '71ae0dff02d756e4d2ca710b79f2ff5390029a5f', 'lessThan': '0b35dc8527ccc16b7dc34e8a3164313e68cd4e45', 'versionType': 'git'}, {'status': 'affected', 'version': '71ae0dff02d756e4d2ca710b79f2ff5390029a5f', 'lessThan': 'b28e2fcad3db7e8687b15bc20bced26b5b7c920e', 'versionType': 'git'}, {'status': 'affected', 'version': '71ae0dff02d756e4d2ca710b79f2ff5390029a5f', 'lessThan': 'a0d16941adf3a501956d74aefd8d6e217906e79c', 'versionType': 'git'}, {'status': 'affected', 'version': '71ae0dff02d756e4d2ca710b79f2ff5390029a5f', 'lessThan': '8d67e42ad3b1a95a152541015a07110e06992d6c', 'versionType': 'git'}, {'status': 'affected', 'version': '71ae0dff02d756e4d2ca710b79f2ff5390029a5f', 'lessThan': '08a3e218064db11f154ad9ad5541751ea7f34ebe', 'versionType': 'git'}, {'status': 'affected', 'version': '71ae0dff02d756e4d2ca710b79f2ff5390029a5f', 'lessThan': 'fb0521aff1e10e300d89725cc439d3ea74c828c5', 'versionType': 'git'}, {'status': 'affected', 'version': '71ae0dff02d756e4d2ca710b79f2ff5390029a5f', 'lessThan': 'f7f2fbb0e893a0238dc464f8d8c0f5609bec584f', 'versionType': 'git'}], 'programFiles': ['net/ipv4/netfilter/arp_tables.c', 'net/ipv4/netfilter/ip_tables.c', 'net/ipv6/netfilter/ip6_tables.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.2'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.259', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.94', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.36', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.13', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv4/netfilter/arp_tables.c', 'net/ipv4/netfilter/ip_tables.c', 'net/ipv6/netfilter/ip6_tables.c'], 'defaultStatus': 'affected'}] Added Description In 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. Added Reference https://git.kernel.org/stable/c/08a3e218064db11f154ad9ad5541751ea7f34ebe Added Reference https://git.kernel.org/stable/c/0b35dc8527ccc16b7dc34e8a3164313e68cd4e45 Added Reference https://git.kernel.org/stable/c/8d67e42ad3b1a95a152541015a07110e06992d6c Added Reference https://git.kernel.org/stable/c/a0d16941adf3a501956d74aefd8d6e217906e79c Added Reference https://git.kernel.org/stable/c/b28e2fcad3db7e8687b15bc20bced26b5b7c920e Added Reference https://git.kernel.org/stable/c/b74ba3343eb44b2cbf7e9665918c287df1d52ebb Added Reference https://git.kernel.org/stable/c/f7f2fbb0e893a0238dc464f8d8c0f5609bec584f Added Reference https://git.kernel.org/stable/c/fb0521aff1e10e300d89725cc439d3ea74c828c5