CVE-2026-53219
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.12.94-1 |
| sid | Fixed | 7.0.13-1 |
| forky | Affected | — |
| bullseye | Affected | — |
| bookworm | Affected | — |
References
- https://git.kernel.org/stable/c/b74ba3343eb44b2cbf7e9665918c287df1d52ebb
- https://git.kernel.org/stable/c/0b35dc8527ccc16b7dc34e8a3164313e68cd4e45
- https://git.kernel.org/stable/c/b28e2fcad3db7e8687b15bc20bced26b5b7c920e
- https://git.kernel.org/stable/c/a0d16941adf3a501956d74aefd8d6e217906e79c
- https://git.kernel.org/stable/c/8d67e42ad3b1a95a152541015a07110e06992d6c
- https://git.kernel.org/stable/c/08a3e218064db11f154ad9ad5541751ea7f34ebe
- https://git.kernel.org/stable/c/fb0521aff1e10e300d89725cc439d3ea74c828c5
- https://git.kernel.org/stable/c/f7f2fbb0e893a0238dc464f8d8c0f5609bec584f
- https://security-tracker.debian.org/tracker/CVE-2026-53219
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.