CVE-2026-43011
Description
In the Linux kernel, the following vulnerability has been resolved: net/x25: Fix potential double free of skb When alloc_skb fails in x25_queue_rx_frame it calls kfree_skb(skb) at line 48 and returns 1 (error). This error propagates back through the call chain: x25_queue_rx_frame returns 1 | v x25_state3_machine receives the return value 1 and takes the else branch at line 278, setting queued=0 and returning 0 | v x25_process_rx_frame returns queued=0 | v x25_backlog_rcv at line 452 sees queued=0 and calls kfree_skb(skb) again This would free the same skb twice. Looking at x25_backlog_rcv: net/x25/x25_in.c:x25_backlog_rcv() { ... queued = x25_process_rx_frame(sk, skb); ... if (!queued) kfree_skb(skb); }
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
Linux kernel Affected 3 releases
| Version | Status | Fixed in |
|---|---|---|
| 7.0 | Affected | — |
| 2.6.12 | Affected | — |
| — | Affected | 5.10.253 |
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.12.85-1 |
| sid | Fixed | 6.19.12-1 |
| forky | Fixed | 6.19.12-1 |
| bullseye | Fixed | 6.1.170-1~deb11u1 |
| bookworm | Fixed | 6.1.170-1 |
References
- https://git.kernel.org/stable/c/143d4fa68ae9efb83b0c55b12cc7f0d03732a2b1
- https://git.kernel.org/stable/c/3f5e3005984645bf5bd129c6b13149879580b1fb
- https://git.kernel.org/stable/c/524371398d8463ea7e101fce2cbf3915645d1730
- https://git.kernel.org/stable/c/5d0aa038a90b30c9bedde0c41c1fdcd98ecb16e9
- https://git.kernel.org/stable/c/c87dd137c0dad07cc55f98181ff380b0c23d2878
- https://git.kernel.org/stable/c/d10a26aa4d072320530e6968ef945c8c575edf61
- https://git.kernel.org/stable/c/f782dd382203b2a8c4552a628431b7de65a19a7b
- https://git.kernel.org/stable/c/fa1dbc93530b34fab0da9862426fe9c918c74dc0
- https://www.suse.com/security/cve/CVE-2026-43011.html
- https://security-tracker.debian.org/tracker/CVE-2026-43011
CWEs
CWE-415
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.