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6.6
Ubuntu Linux: Unpatched Sockets Can Cause Local Privilege Escalation
UBUNTU-CVE-2025-13350
Summary
A security issue in Ubuntu Linux versions 6.8.0-56.58 to 6.8.0-84.84 can allow an attacker to gain elevated access to the system. This is because the operating system fails to properly manage certain types of network connections, leading to a situation where the system tries to access memory that has already been freed. To fix this issue, update your Ubuntu Linux installation to a version that includes the necessary patch.
What to do
- Update canonical linux-aws-6.8 to version 6.8.0-1039.41~22.04.1.
- Update canonical linux-azure-6.8 to version 6.8.0-1040.46~22.04.1.
- Update canonical linux-gcp-6.8 to version 6.8.0-1040.42~22.04.1.
- Update canonical linux-hwe-6.8 to version 6.8.0-85.85~22.04.1.
- Update canonical linux-ibm-6.8 to version 6.8.0-1037.37~22.04.1.
- Update canonical linux-lowlatency-hwe-6.8 to version 6.8.0-84.84.1~22.04.1.
- Update canonical linux-nvidia-6.8 to version 6.8.0-1039.42~22.04.1.
- Update canonical linux-oracle-6.8 to version 6.8.0-1037.38~22.04.1.
- Update canonical linux-riscv-6.8 to version 6.8.0-84.84~22.04.1.
- Update canonical linux-realtime-6.8 to version 6.8.1-1034.35~22.04.1.
- Update canonical linux to version 6.8.0-84.84.
- Update canonical linux-aws to version 6.8.0-1039.41.
- Update canonical linux-azure to version 6.8.0-1038.44.
- Update canonical linux-azure-nvidia to version 6.8.0-1025.27.
- Update canonical linux-gcp to version 6.8.0-1040.42.
- Update canonical linux-gke to version 6.8.0-1036.40.
- Update canonical linux-gkeop to version 6.8.0-1023.25.
- Update canonical linux-ibm to version 6.8.0-1037.37.
- Update canonical linux-lowlatency to version 6.8.0-84.84.1.
- Update canonical linux-nvidia to version 6.8.0-1039.42.
- Update canonical linux-nvidia-lowlatency to version 6.8.0-1039.42.1.
- Update canonical linux-nvidia-tegra to version 6.8.0-1012.12.
- Update canonical linux-oracle to version 6.8.0-1037.38.
- Update canonical linux-raspi to version 6.8.0-1039.43.
- Update canonical linux-xilinx to version 6.8.0-1018.19.
- Update canonical linux-aws-fips to version 6.8.0-1039.41+fips1.
- Update canonical linux-azure-fips to version 6.8.0-1040.46+fips1.
- Update canonical linux-fips to version 6.8.0-84.84+fips1.
- Update canonical linux-gcp-fips to version 6.8.0-1040.42+fips1.
- Update canonical linux-raspi-realtime to version 6.8.0-2031.32.
- Update canonical linux-realtime to version 6.8.1-1034.35.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| canonical | linux-hwe-edge | All versions | – |
| canonical | linux-aws-5.0 | All versions | – |
| canonical | linux-aws-5.3 | All versions | – |
| canonical | linux-azure | All versions | – |
| canonical | linux-azure-5.3 | All versions | – |
| canonical | linux-azure-edge | All versions | – |
| canonical | linux-gcp | All versions | – |
| canonical | linux-gcp-5.3 | All versions | – |
| canonical | linux-gke-4.15 | All versions | – |
| canonical | linux-gke-5.4 | All versions | – |
| canonical | linux-gkeop-5.4 | All versions | – |
| canonical | linux-hwe | All versions | – |
| canonical | linux-hwe-edge | All versions | – |
| canonical | linux-oem | All versions | – |
| canonical | linux-oracle-5.0 | All versions | – |
| canonical | linux-oracle-5.3 | All versions | – |
| canonical | linux-aws-5.11 | All versions | – |
| canonical | linux-aws-5.13 | All versions | – |
| canonical | linux-aws-5.8 | All versions | – |
| canonical | linux-azure-5.11 | All versions | – |
| canonical | linux-azure-5.13 | All versions | – |
| canonical | linux-azure-5.8 | All versions | – |
| canonical | linux-azure-fde | All versions | – |
| canonical | linux-gcp-5.11 | All versions | – |
| canonical | linux-gcp-5.13 | All versions | – |
| canonical | linux-gcp-5.8 | All versions | – |
| canonical | linux-gke | All versions | – |
| canonical | linux-gke-5.15 | All versions | – |
| canonical | linux-gkeop | All versions | – |
| canonical | linux-gkeop-5.15 | All versions | – |
| canonical | linux-hwe-5.11 | All versions | – |
| canonical | linux-hwe-5.13 | All versions | – |
| canonical | linux-hwe-5.8 | All versions | – |
| canonical | linux-intel-5.13 | All versions | – |
| canonical | linux-oem-5.10 | All versions | – |
| canonical | linux-oem-5.13 | All versions | – |
| canonical | linux-oem-5.14 | All versions | – |
| canonical | linux-oem-5.6 | All versions | – |
| canonical | linux-oracle-5.11 | All versions | – |
| canonical | linux-oracle-5.13 | All versions | – |
| canonical | linux-oracle-5.8 | All versions | – |
| canonical | linux-raspi2 | All versions | – |
| canonical | linux-riscv | All versions | – |
| canonical | linux-riscv-5.11 | All versions | – |
| canonical | linux-riscv-5.8 | All versions | – |
| canonical | linux-allwinner-5.19 | All versions | – |
| canonical | linux-aws-5.19 | All versions | – |
| canonical | linux-aws-6.2 | All versions | – |
| canonical | linux-aws-6.5 | All versions | – |
| canonical | linux-aws-6.8 | <= 6.8.0-1039.41~22.04.1 | 6.8.0-1039.41~22.04.1 |
| canonical | linux-azure-5.19 | All versions | – |
| canonical | linux-azure-6.2 | All versions | – |
| canonical | linux-azure-6.5 | All versions | – |
| canonical | linux-azure-6.8 | <= 6.8.0-1040.46~22.04.1 | 6.8.0-1040.46~22.04.1 |
| canonical | linux-azure-fde-5.19 | All versions | – |
| canonical | linux-azure-fde-6.2 | All versions | – |
| canonical | linux-azure-fde-6.8 | All versions | – |
| canonical | linux-gcp-5.19 | All versions | – |
| canonical | linux-gcp-6.2 | All versions | – |
| canonical | linux-gcp-6.5 | All versions | – |
| canonical | linux-gcp-6.8 | <= 6.8.0-1040.42~22.04.1 | 6.8.0-1040.42~22.04.1 |
| canonical | linux-hwe-5.19 | All versions | – |
| canonical | linux-hwe-6.2 | All versions | – |
| canonical | linux-hwe-6.5 | All versions | – |
| canonical | linux-hwe-6.8 | <= 6.8.0-85.85~22.04.1 | 6.8.0-85.85~22.04.1 |
| canonical | linux-ibm-6.8 | <= 6.8.0-1037.37~22.04.1 | 6.8.0-1037.37~22.04.1 |
| canonical | linux-intel-iot-realtime | All versions | – |
| canonical | linux-lowlatency-hwe-5.19 | All versions | – |
| canonical | linux-lowlatency-hwe-6.2 | All versions | – |
| canonical | linux-lowlatency-hwe-6.5 | All versions | – |
| canonical | linux-lowlatency-hwe-6.8 | <= 6.8.0-84.84.1~22.04.1 | 6.8.0-84.84.1~22.04.1 |
| canonical | linux-nvidia-6.2 | All versions | – |
| canonical | linux-nvidia-6.5 | All versions | – |
| canonical | linux-nvidia-6.8 | <= 6.8.0-1039.42~22.04.1 | 6.8.0-1039.42~22.04.1 |
| canonical | linux-oem-5.17 | All versions | – |
| canonical | linux-oem-6.0 | All versions | – |
| canonical | linux-oem-6.1 | All versions | – |
| canonical | linux-oem-6.5 | All versions | – |
| canonical | linux-oracle-6.5 | All versions | – |
| canonical | linux-oracle-6.8 | <= 6.8.0-1037.38~22.04.1 | 6.8.0-1037.38~22.04.1 |
| canonical | linux-realtime | All versions | – |
| canonical | linux-riscv | All versions | – |
| canonical | linux-riscv-5.19 | All versions | – |
| canonical | linux-riscv-6.5 | All versions | – |
| canonical | linux-riscv-6.8 | <= 6.8.0-84.84~22.04.1 | 6.8.0-84.84~22.04.1 |
| canonical | linux-starfive-5.19 | All versions | – |
| canonical | linux-starfive-6.2 | All versions | – |
| canonical | linux-starfive-6.5 | All versions | – |
| canonical | linux-realtime-6.8 | <= 6.8.1-1034.35~22.04.1 | 6.8.1-1034.35~22.04.1 |
| canonical | linux | <= 6.8.0-84.84 | 6.8.0-84.84 |
| canonical | linux-aws | <= 6.8.0-1039.41 | 6.8.0-1039.41 |
| canonical | linux-azure | <= 6.8.0-1038.44 | 6.8.0-1038.44 |
| canonical | linux-azure-6.11 | All versions | – |
| canonical | linux-azure-nvidia | <= 6.8.0-1025.27 | 6.8.0-1025.27 |
| canonical | linux-gcp | <= 6.8.0-1040.42 | 6.8.0-1040.42 |
| canonical | linux-gcp-6.11 | All versions | – |
| canonical | linux-gke | <= 6.8.0-1036.40 | 6.8.0-1036.40 |
| canonical | linux-gkeop | <= 6.8.0-1023.25 | 6.8.0-1023.25 |
| canonical | linux-hwe-6.11 | All versions | – |
| canonical | linux-ibm | <= 6.8.0-1037.37 | 6.8.0-1037.37 |
| canonical | linux-lowlatency | <= 6.8.0-84.84.1 | 6.8.0-84.84.1 |
| canonical | linux-lowlatency-hwe-6.11 | All versions | – |
| canonical | linux-nvidia | <= 6.8.0-1039.42 | 6.8.0-1039.42 |
| canonical | linux-nvidia-6.11 | All versions | – |
| canonical | linux-nvidia-lowlatency | <= 6.8.0-1039.42.1 | 6.8.0-1039.42.1 |
| canonical | linux-nvidia-tegra | <= 6.8.0-1012.12 | 6.8.0-1012.12 |
| canonical | linux-oem-6.11 | All versions | – |
| canonical | linux-oem-6.14 | All versions | – |
| canonical | linux-oem-6.8 | All versions | – |
| canonical | linux-oracle | <= 6.8.0-1037.38 | 6.8.0-1037.38 |
| canonical | linux-oracle-6.14 | All versions | – |
| canonical | linux-raspi | <= 6.8.0-1039.43 | 6.8.0-1039.43 |
| canonical | linux-raspi-realtime | All versions | – |
| canonical | linux-realtime | All versions | – |
| canonical | linux-riscv | All versions | – |
| canonical | linux-riscv-6.14 | All versions | – |
| canonical | linux-xilinx | <= 6.8.0-1018.19 | 6.8.0-1018.19 |
| canonical | linux-aws-fips | <= 6.8.0-1039.41+fips1 | 6.8.0-1039.41+fips1 |
| canonical | linux-azure-fips | <= 6.8.0-1040.46+fips1 | 6.8.0-1040.46+fips1 |
| canonical | linux-fips | <= 6.8.0-84.84+fips1 | 6.8.0-84.84+fips1 |
| canonical | linux-gcp-fips | <= 6.8.0-1040.42+fips1 | 6.8.0-1040.42+fips1 |
| canonical | linux-raspi-realtime | <= 6.8.0-2031.32 | 6.8.0-2031.32 |
| canonical | linux-realtime | <= 6.8.1-1034.35 | 6.8.1-1034.35 |
| canonical | linux-realtime-6.14 | All versions | – |
Original title
Ubuntu Linux 6.8 GA retains the legacy AF_UNIX garbage collector but backports upstream commit 8594d9b85c07 ("af_unix: Don’t call skb_get() for OOB skb"). When orphaned MSG_OOB sockets hit unix_gc(...
Original description
Ubuntu Linux 6.8 GA retains the legacy AF_UNIX garbage collector but backports upstream commit 8594d9b85c07 ("af_unix: Don’t call skb_get() for OOB skb"). When orphaned MSG_OOB sockets hit unix_gc(), the garbage collector still calls kfree_skb() as if OOB SKBs held two references; on Ubuntu Linux 6.8 (Noble Numbat) kernel tree, they have only the queue reference, so the buffer is freed while still reachable and subsequent queue walks dereference freed memory, yielding a reliable local privilege escalation (LPE) caused by a use-after-free (UAF). Ubuntu builds that have already taken the new GC stack from commit 4090fa373f0e, and mainline Linux kernels shipping that infrastructure are unaffected because they no longer execute the legacy collector path. This issue affects Ubuntu Linux from 6.8.0-56.58 before 6.8.0-84.84.
osv CVSS4.0
6.6
- https://ubuntu.com/security/CVE-2025-13350 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2025-13350 Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/05/7 Third Party Advisory
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/commit/... Third Party Advisory
Published: 6 Mar 2026 · Updated: 13 Mar 2026 · First seen: 10 Mar 2026