🛡️ CVE-2026-43011 on Ubuntu — linux
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); }
Distribution advisory
This page covers CVE-2026-43011 as tracked by Ubuntu, for the package linux. The fix is available in version 6.17.0-40.40; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.
Affected software and timeline
Affected software: linux (fixed in 6.17.0-40.40), linux-allwinner-5.19, linux-aws (fixed in 6.17.0-1019.19), linux-aws-5.0, linux-aws-5.11, linux-aws-5.13, linux-aws-5.15 (fixed in 5.15.0-1111.118~20.04.1), linux-aws-5.19, linux-aws-5.3, linux-aws-5.4 (fixed in 5.4.0-1161.172~18.04.1), linux-aws-5.8, linux-aws-6.14, linux-aws-6.17 (fixed in 6.17.0-1019.19~24.04.1), linux-aws-6.2, linux-aws-6.5, linux-aws-6.8 (fixed in 6.8.0-1060.63~22.04.1), linux-aws-fips (fixed in 6.8.0-1060.63+fips1), linux-aws-hwe, linux-azure, linux-azure-4.15 (fixed in 4.15.0-1204.219), linux-azure-5.11, linux-azure-5.13, linux-azure-5.15 (fixed in 5.15.0-1116.125~20.04.1), linux-azure-5.19, linux-azure-5.3, linux-azure-5.4 (fixed in 5.4.0-1166.172~18.04.1), linux-azure-5.8, linux-azure-6.11, linux-azure-6.14, linux-azure-6.17 (fixed in 6.17.0-1021.21~24.04.1), linux-azure-6.2, linux-azure-6.5, linux-azure-6.8 (fixed in 6.8.0-1063.71~22.04.1), linux-azure-edge, linux-azure-fde, linux-azure-fde-5.15 (fixed in 5.15.0-1116.125~20.04.1), linux-azure-fde-5.19, linux-azure-fde-6.14, linux-azure-fde-6.17, linux-azure-fde-6.2, linux-azure-fde-6.8 (fixed in 6.8.0-1062.69~22.04.1), linux-azure-fips (fixed in 6.8.0-1062.69+fips1), linux-azure-nvidia, linux-azure-nvidia-6.14, linux-bluefield, linux-fips (fixed in 6.8.0-134.134+fips1), linux-gcp (fixed in 6.17.0-1020.22), linux-gcp-4.15 (fixed in 4.15.0-1187.204), linux-gcp-5.11, linux-gcp-5.13, linux-gcp-5.15 (fixed in 5.15.0-1111.121~20.04.1), linux-gcp-5.19, linux-gcp-5.3, linux-gcp-5.4 (fixed in 5.4.0-1164.173~18.04.1), linux-gcp-5.8, linux-gcp-6.11, linux-gcp-6.14, linux-gcp-6.17 (fixed in 6.17.0-1020.22~24.04.1), linux-gcp-6.2, linux-gcp-6.5, linux-gcp-6.8 (fixed in 6.8.0-1063.69~22.04.1), linux-gcp-fips (fixed in 6.8.0-1063.69+fips1), linux-gke (fixed in 6.8.0-1058.64), linux-gke-4.15, linux-gke-5.15, linux-gke-5.4, linux-gkeop (fixed in 6.8.0-1045.48), linux-gkeop-5.15, linux-gkeop-5.4, linux-hwe, linux-hwe-5.11, linux-hwe-5.13, linux-hwe-5.15 (fixed in 5.15.0-185.195~20.04.1), linux-hwe-5.19, linux-hwe-5.4 (fixed in 5.4.0-233.253~18.04.1), linux-hwe-5.8, linux-hwe-6.11, linux-hwe-6.14, linux-hwe-6.17 (fixed in 6.17.0-40.40~24.04.1), linux-hwe-6.2, linux-hwe-6.5, linux-hwe-6.8 (fixed in 6.8.0-136.136~22.04.1), linux-hwe-edge, linux-ibm (fixed in 6.8.0-1060.61), linux-ibm-5.15 (fixed in 5.15.0-1105.109~20.04.1), linux-ibm-5.4 (fixed in 5.4.0-1107.112~18.04.1), linux-ibm-6.8 (fixed in 6.8.0-1060.61~22.04.1), linux-intel-5.13, linux-intel-iot-realtime (fixed in 5.15.0-1103.105), linux-intel-iotg (fixed in 5.15.0-1106.112), linux-intel-iotg-5.15 (fixed in 5.15.0-1106.112~20.04.1), linux-iot (fixed in 5.4.0-1065.68), linux-kvm (fixed in 5.15.0-1103.108), linux-lowlatency (fixed in 6.8.0-134.134.1), linux-lowlatency-hwe-5.15 (fixed in 5.15.0-183.193~20.04.1), linux-lowlatency-hwe-5.19, linux-lowlatency-hwe-6.11, linux-lowlatency-hwe-6.2, linux-lowlatency-hwe-6.5, linux-lowlatency-hwe-6.8 (fixed in 6.8.0-134.134.1~22.04.1), linux-lts-xenial (fixed in 4.4.0-283.317~14.04.1), linux-nvidia (fixed in 7.0.0-1006.6), linux-nvidia-6.11, linux-nvidia-6.17 (fixed in 6.17.0-1026.26), linux-nvidia-6.2, linux-nvidia-6.5, linux-nvidia-6.8 (fixed in 6.8.0-1058.61~22.04.1), linux-nvidia-lowlatency (fixed in 6.8.0-1058.61.1), linux-nvidia-tegra (fixed in 6.8.0-1029.30), linux-nvidia-tegra-5.15 (fixed in 5.15.0-1063.63~20.04.1), linux-nvidia-tegra-igx (fixed in 5.15.0-1052.52), linux-oem, linux-oem-5.10, linux-oem-5.13, linux-oem-5.14, linux-oem-5.17, linux-oem-5.6, linux-oem-6.0, linux-oem-6.1, linux-oem-6.11, linux-oem-6.14, linux-oem-6.17 (fixed in 6.17.0-1028.28), linux-oem-6.5, linux-oem-6.8, linux-oracle (fixed in 6.17.0-1018.18), linux-oracle-5.0, linux-oracle-5.11, linux-oracle-5.13, linux-oracle-5.15 (fixed in 5.15.0-1108.114~20.04.1), linux-oracle-5.3, linux-oracle-5.4 (fixed in 5.4.0-1159.169~18.04.1), linux-oracle-5.8, linux-oracle-6.14, linux-oracle-6.17 (fixed in 6.17.0-1018.18~24.04.1), linux-oracle-6.5, linux-oracle-6.8 (fixed in 6.8.0-1057.58~22.04.1), linux-raspi (fixed in 6.17.0-1021.21), linux-raspi-5.4 (fixed in 5.4.0-1144.157~18.04.1), linux-raspi-realtime (fixed in 6.8.0-2049.50), linux-raspi2, linux-realtime (fixed in 6.17.0-1017.19), linux-realtime-6.14, linux-realtime-6.17 (fixed in 6.17.0-1017.19~24.04.1), linux-realtime-6.8 (fixed in 6.8.1-1055.56~22.04.1), linux-riscv (fixed in 6.17.0-40.40.1), linux-riscv-5.11, linux-riscv-5.15 (fixed in 5.15.0-1105.109~20.04.1), linux-riscv-5.19, linux-riscv-5.8, linux-riscv-6.14, linux-riscv-6.17, linux-riscv-6.5, linux-riscv-6.8 (fixed in 6.8.0-134.134~22.04.1), linux-starfive-5.19, linux-starfive-6.2, linux-starfive-6.5, linux-xilinx (fixed in 6.8.0-1032.33) and linux-xilinx-zynqmp (fixed in 5.15.0-1074.78). Published on 1 May 2026 and last revised on 11 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
References
ubuntu.com (Report)
www.cve.org (Report)
git.kernel.org (Report)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
CVE-2026-43011 on other distributions
Each distribution ships its own build and its own fixed version. Pick the one you run:
Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| linux | — | 6.17.0-40.40 |
| linux-allwinner-5.19 | — | — |
| linux-aws | — | 6.17.0-1019.19 |
| linux-aws-5.0 | — | — |
| linux-aws-5.11 | — | — |
| linux-aws-5.13 | — | — |
| linux-aws-5.15 | — | 5.15.0-1111.118~20.04.1 |
| linux-aws-5.19 | — | — |
| linux-aws-5.3 | — | — |
| linux-aws-5.4 | — | 5.4.0-1161.172~18.04.1 |
| linux-aws-5.8 | — | — |
| linux-aws-6.14 | — | — |
| linux-aws-6.17 | — | 6.17.0-1019.19~24.04.1 |
| linux-aws-6.2 | — | — |
| linux-aws-6.5 | — | — |
| linux-aws-6.8 | — | 6.8.0-1060.63~22.04.1 |
| linux-aws-fips | — | 6.8.0-1060.63+fips1 |
| linux-aws-hwe | — | — |
| linux-azure | — | — |
| linux-azure-4.15 | — | 4.15.0-1204.219 |
| linux-azure-5.11 | — | — |
| linux-azure-5.13 | — | — |
| linux-azure-5.15 | — | 5.15.0-1116.125~20.04.1 |
| linux-azure-5.19 | — | — |
| linux-azure-5.3 | — | — |
| linux-azure-5.4 | — | 5.4.0-1166.172~18.04.1 |
| linux-azure-5.8 | — | — |
| linux-azure-6.11 | — | — |
| linux-azure-6.14 | — | — |
| linux-azure-6.17 | — | 6.17.0-1021.21~24.04.1 |
| linux-azure-6.2 | — | — |
| linux-azure-6.5 | — | — |
| linux-azure-6.8 | — | 6.8.0-1063.71~22.04.1 |
| linux-azure-edge | — | — |
| linux-azure-fde | — | — |
| linux-azure-fde-5.15 | — | 5.15.0-1116.125~20.04.1 |
| linux-azure-fde-5.19 | — | — |
| linux-azure-fde-6.14 | — | — |
| linux-azure-fde-6.17 | — | — |
| linux-azure-fde-6.2 | — | — |
| linux-azure-fde-6.8 | — | 6.8.0-1062.69~22.04.1 |
| linux-azure-fips | — | 6.8.0-1062.69+fips1 |
| linux-azure-nvidia | — | — |
| linux-azure-nvidia-6.14 | — | — |
| linux-bluefield | — | — |
| linux-fips | — | 6.8.0-134.134+fips1 |
| linux-gcp | — | 6.17.0-1020.22 |
| linux-gcp-4.15 | — | 4.15.0-1187.204 |
| linux-gcp-5.11 | — | — |
| linux-gcp-5.13 | — | — |
| linux-gcp-5.15 | — | 5.15.0-1111.121~20.04.1 |
| linux-gcp-5.19 | — | — |
| linux-gcp-5.3 | — | — |
| linux-gcp-5.4 | — | 5.4.0-1164.173~18.04.1 |
| linux-gcp-5.8 | — | — |
| linux-gcp-6.11 | — | — |
| linux-gcp-6.14 | — | — |
| linux-gcp-6.17 | — | 6.17.0-1020.22~24.04.1 |
| linux-gcp-6.2 | — | — |
| linux-gcp-6.5 | — | — |
| linux-gcp-6.8 | — | 6.8.0-1063.69~22.04.1 |
| linux-gcp-fips | — | 6.8.0-1063.69+fips1 |
| linux-gke | — | 6.8.0-1058.64 |
| linux-gke-4.15 | — | — |
| linux-gke-5.15 | — | — |
| linux-gke-5.4 | — | — |
| linux-gkeop | — | 6.8.0-1045.48 |
| linux-gkeop-5.15 | — | — |
| linux-gkeop-5.4 | — | — |
| linux-hwe | — | — |
| linux-hwe-5.11 | — | — |
| linux-hwe-5.13 | — | — |
| linux-hwe-5.15 | — | 5.15.0-185.195~20.04.1 |
| linux-hwe-5.19 | — | — |
| linux-hwe-5.4 | — | 5.4.0-233.253~18.04.1 |
| linux-hwe-5.8 | — | — |
| linux-hwe-6.11 | — | — |
| linux-hwe-6.14 | — | — |
| linux-hwe-6.17 | — | 6.17.0-40.40~24.04.1 |
| linux-hwe-6.2 | — | — |
| linux-hwe-6.5 | — | — |
| linux-hwe-6.8 | — | 6.8.0-136.136~22.04.1 |
| linux-hwe-edge | — | — |
| linux-ibm | — | 6.8.0-1060.61 |
| linux-ibm-5.15 | — | 5.15.0-1105.109~20.04.1 |
| linux-ibm-5.4 | — | 5.4.0-1107.112~18.04.1 |
| linux-ibm-6.8 | — | 6.8.0-1060.61~22.04.1 |
| linux-intel-5.13 | — | — |
| linux-intel-iot-realtime | — | 5.15.0-1103.105 |
| linux-intel-iotg | — | 5.15.0-1106.112 |
| linux-intel-iotg-5.15 | — | 5.15.0-1106.112~20.04.1 |
| linux-iot | — | 5.4.0-1065.68 |
| linux-kvm | — | 5.15.0-1103.108 |
| linux-lowlatency | — | 6.8.0-134.134.1 |
| linux-lowlatency-hwe-5.15 | — | 5.15.0-183.193~20.04.1 |
| linux-lowlatency-hwe-5.19 | — | — |
| linux-lowlatency-hwe-6.11 | — | — |
| linux-lowlatency-hwe-6.2 | — | — |
| linux-lowlatency-hwe-6.5 | — | — |
| linux-lowlatency-hwe-6.8 | — | 6.8.0-134.134.1~22.04.1 |
| linux-lts-xenial | — | 4.4.0-283.317~14.04.1 |
| linux-nvidia | — | 7.0.0-1006.6 |
| linux-nvidia-6.11 | — | — |
| linux-nvidia-6.17 | — | 6.17.0-1026.26 |
| linux-nvidia-6.2 | — | — |
| linux-nvidia-6.5 | — | — |
| linux-nvidia-6.8 | — | 6.8.0-1058.61~22.04.1 |
| linux-nvidia-lowlatency | — | 6.8.0-1058.61.1 |
| linux-nvidia-tegra | — | 6.8.0-1029.30 |
| linux-nvidia-tegra-5.15 | — | 5.15.0-1063.63~20.04.1 |
| linux-nvidia-tegra-igx | — | 5.15.0-1052.52 |
| linux-oem | — | — |
| linux-oem-5.10 | — | — |
| linux-oem-5.13 | — | — |
| linux-oem-5.14 | — | — |
| linux-oem-5.17 | — | — |
| linux-oem-5.6 | — | — |
| linux-oem-6.0 | — | — |
| linux-oem-6.1 | — | — |
| linux-oem-6.11 | — | — |
| linux-oem-6.14 | — | — |
| linux-oem-6.17 | — | 6.17.0-1028.28 |
| linux-oem-6.5 | — | — |
| linux-oem-6.8 | — | — |
| linux-oracle | — | 6.17.0-1018.18 |
| linux-oracle-5.0 | — | — |
| linux-oracle-5.11 | — | — |
| linux-oracle-5.13 | — | — |
| linux-oracle-5.15 | — | 5.15.0-1108.114~20.04.1 |
| linux-oracle-5.3 | — | — |
| linux-oracle-5.4 | — | 5.4.0-1159.169~18.04.1 |
| linux-oracle-5.8 | — | — |
| linux-oracle-6.14 | — | — |
| linux-oracle-6.17 | — | 6.17.0-1018.18~24.04.1 |
| linux-oracle-6.5 | — | — |
| linux-oracle-6.8 | — | 6.8.0-1057.58~22.04.1 |
| linux-raspi | — | 6.17.0-1021.21 |
| linux-raspi-5.4 | — | 5.4.0-1144.157~18.04.1 |
| linux-raspi-realtime | — | 6.8.0-2049.50 |
| linux-raspi2 | — | — |
| linux-realtime | — | 6.17.0-1017.19 |
| linux-realtime-6.14 | — | — |
| linux-realtime-6.17 | — | 6.17.0-1017.19~24.04.1 |
| linux-realtime-6.8 | — | 6.8.1-1055.56~22.04.1 |
| linux-riscv | — | 6.17.0-40.40.1 |
| linux-riscv-5.11 | — | — |
| linux-riscv-5.15 | — | 5.15.0-1105.109~20.04.1 |
| linux-riscv-5.19 | — | — |
| linux-riscv-5.8 | — | — |
| linux-riscv-6.14 | — | — |
| linux-riscv-6.17 | — | — |
| linux-riscv-6.5 | — | — |
| linux-riscv-6.8 | — | 6.8.0-134.134~22.04.1 |
| linux-starfive-5.19 | — | — |
| linux-starfive-6.2 | — | — |
| linux-starfive-6.5 | — | — |
| linux-xilinx | — | 6.8.0-1032.33 |
| linux-xilinx-zynqmp | — | 5.15.0-1074.78 |
References
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