🛡️ CVE-2025-39682 on Ubuntu — linux
Description
In the Linux kernel, the following vulnerability has been resolved: tls: fix handling of zero-length records on the rx_list Each recvmsg() call must process either - only contiguous DATA records (any number of them) - one non-DATA record If the next record has different type than what has already been processed we break out of the main processing loop. If the record has already been decrypted (which may be the case for TLS 1.3 where we don't know type until decryption) we queue the pending record to the rx_list. Next recvmsg() will pick it up from there. Queuing the skb to rx_list after zero-copy decrypt is not possible, since in that case we decrypted directly to the user space buffer, and we don't have an skb to queue (darg.skb points to the ciphertext skb for access to metadata like length). Only data records are allowed zero-copy, and we break the processing loop after each non-data record. So we should never zero-copy and then find out that the record type has changed. The corner case we missed is when the initial record comes from rx_list, and it's zero length.
Distribution advisory
This page covers CVE-2025-39682 as tracked by Ubuntu, for the package linux. The fix is available in version 6.8.0-86.87; 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.
CVSS metrics in full
The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Attack vector: Network — reachable from anywhere that can route to the service.
- Attack complexity: Low — the attack works reliably, with no preparation.
- Privileges required: None — an unauthenticated stranger can try it.
- User interaction: None — nobody has to be tricked into anything.
- Scope: Unchanged — the damage stays inside the vulnerable component.
- Confidentiality impact: High — total loss, or loss the attacker controls.
- Integrity impact: High — total loss, or loss the attacker controls.
- Availability impact: High — total loss, or loss the attacker controls.
Affected software
UBUNTU-CVE-2025-39682 is recorded against 119 packages.
- linux (fixed in 6.8.0-86.87)
- linux-allwinner-5.19
- linux-aws (fixed in 6.8.0-1041.43)
- linux-aws-5.0
- linux-aws-5.11
- linux-aws-5.13
- linux-aws-5.19
- linux-aws-5.3
- linux-aws-5.8
- linux-aws-6.14 (fixed in 6.14.0-1015.15~24.04.1)
- linux-aws-6.2
- linux-aws-6.5
- linux-aws-6.8 (fixed in 6.8.0-1041.43~22.04.1)
- linux-aws-fips (fixed in 6.8.0-1041.43+fips1)
- linux-azure (fixed in 6.8.0-1041.47)
- linux-azure-5.11
- linux-azure-5.13
- linux-azure-5.19
- linux-azure-5.3
- linux-azure-5.8
- linux-azure-6.11
- linux-azure-6.14 (fixed in 6.14.0-1014.14~24.04.1)
- linux-azure-6.2
- linux-azure-6.5
Show the remaining 95 packages
- linux-azure-6.8 (fixed in 6.8.0-1041.47~22.04.1)
- linux-azure-edge
- linux-azure-fde
- linux-azure-fde-5.19
- linux-azure-fde-6.2
- linux-azure-fips (fixed in 6.8.0-1044.50+fips1)
- linux-azure-nvidia (fixed in 6.8.0-1029.32)
- linux-azure-nvidia-6.14 (fixed in 6.14.0-1007.7)
- linux-bluefield
- linux-fips (fixed in 6.8.0-86.87+fips1)
- linux-gcp (fixed in 6.8.0-1042.45)
- linux-gcp-5.11
- linux-gcp-5.13
- linux-gcp-5.19
- linux-gcp-5.3
- linux-gcp-5.8
- linux-gcp-6.11
- linux-gcp-6.14 (fixed in 6.14.0-1018.19~24.04.1)
- linux-gcp-6.2
- linux-gcp-6.5
- linux-gcp-6.8 (fixed in 6.8.0-1042.45~22.04.1)
- linux-gcp-fips (fixed in 6.8.0-1042.45+fips1)
- linux-gke (fixed in 6.8.0-1038.43)
- linux-gke-4.15
- linux-gke-5.15
- linux-gke-5.4
- linux-gkeop (fixed in 6.8.0-1025.28)
- linux-gkeop-5.15
- linux-gkeop-5.4
- linux-hwe
- linux-hwe-5.11
- linux-hwe-5.13
- linux-hwe-5.19
- linux-hwe-5.8
- linux-hwe-6.11
- linux-hwe-6.2
- linux-hwe-6.5
- linux-hwe-6.8 (fixed in 6.8.0-86.87~22.04.1)
- linux-hwe-edge
- linux-ibm (fixed in 6.8.0-1039.39)
- linux-ibm-6.8 (fixed in 6.8.0-1039.39~22.04.1)
- linux-intel
- linux-intel-5.13
- linux-intel-iot-realtime
- linux-lowlatency (fixed in 6.8.0-86.87.1)
- 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 6.8.0-86.87.1~22.04.1)
- linux-nvidia (fixed in 6.8.0-1041.44)
- linux-nvidia-6.11
- linux-nvidia-6.2
- linux-nvidia-6.5
- linux-nvidia-6.8 (fixed in 6.8.0-1041.44~22.04.2)
- linux-nvidia-lowlatency (fixed in 6.8.0-1041.44.1)
- linux-nvidia-tegra (fixed in 6.8.0-1012.12)
- 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 (fixed in 6.14.0-1014.14)
- linux-oem-6.5
- linux-oem-6.8
- linux-oracle (fixed in 6.8.0-1038.39)
- linux-oracle-5.0
- linux-oracle-5.11
- linux-oracle-5.13
- linux-oracle-5.3
- linux-oracle-5.8
- linux-oracle-6.14 (fixed in 6.14.0-1015.15~24.04.1)
- linux-oracle-6.5
- linux-oracle-6.8 (fixed in 6.8.0-1038.39~22.04.1)
- linux-raspi (fixed in 6.8.0-1041.45)
- linux-raspi-realtime (fixed in 6.8.0-2032.33)
- linux-raspi2
- linux-realtime (fixed in 6.8.1-1036.37)
- linux-realtime-6.14 (fixed in 6.14.0-1014.14~24.04.1)
- linux-realtime-6.8 (fixed in 6.8.1-1036.37~22.04.1)
- linux-riscv
- linux-riscv-5.11
- linux-riscv-5.19
- linux-riscv-5.8
- linux-riscv-6.14 (fixed in 6.14.0-34.34.1~24.04.1)
- linux-riscv-6.5
- linux-riscv-6.8 (fixed in 6.8.0-86.87~22.04.1)
- linux-starfive-5.19
- linux-starfive-6.2
- linux-starfive-6.5
- linux-xilinx (fixed in 6.8.0-1018.19)
Timeline and source
Published on 5 September 2025 and last revised on 17 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)
git.kernel.org (Report)
git.kernel.org (Report)
git.kernel.org (Report)
git.kernel.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)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
Other advisories for this package
linux has other advisories on record. If you are patching this one, these are worth checking on the same host:
- DEBIAN-CVE-2022-4994 (published 30 Jul 2026)
- CVE-2026-35233 (4.4 Medium, published 1 May 2026)
- CVE-2026-21996 (3.3 Low, published 1 May 2026)
- CVE-2026-21991 (5.5 Medium, published 16 Mar 2026)
- CGA-mcwh-q4vm-9f29 (published 29 Jan 2026)
- CGA-w6xv-3fg4-grm5 (published 29 Jan 2026)
- CGA-4fpx-x3w2-4hfv (published 7 Jan 2026)
- CGA-fv2v-4h6c-q367 (published 7 Jan 2026)
CVE-2025-39682 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 | — | 6.8.0-86.87 |
| linux-allwinner-5.19 | — | — |
| linux-aws | — | 6.8.0-1041.43 |
| linux-aws-5.0 | — | — |
| linux-aws-5.11 | — | — |
| linux-aws-5.13 | — | — |
| linux-aws-5.19 | — | — |
| linux-aws-5.3 | — | — |
| linux-aws-5.8 | — | — |
| linux-aws-6.14 | — | 6.14.0-1015.15~24.04.1 |
| linux-aws-6.2 | — | — |
| linux-aws-6.5 | — | — |
| linux-aws-6.8 | — | 6.8.0-1041.43~22.04.1 |
| linux-aws-fips | — | 6.8.0-1041.43+fips1 |
| linux-azure | — | 6.8.0-1041.47 |
| linux-azure-5.11 | — | — |
| linux-azure-5.13 | — | — |
| linux-azure-5.19 | — | — |
| linux-azure-5.3 | — | — |
| linux-azure-5.8 | — | — |
| linux-azure-6.11 | — | — |
| linux-azure-6.14 | — | 6.14.0-1014.14~24.04.1 |
| linux-azure-6.2 | — | — |
| linux-azure-6.5 | — | — |
| linux-azure-6.8 | — | 6.8.0-1041.47~22.04.1 |
| linux-azure-edge | — | — |
| linux-azure-fde | — | — |
| linux-azure-fde-5.19 | — | — |
| linux-azure-fde-6.2 | — | — |
| linux-azure-fips | — | 6.8.0-1044.50+fips1 |
| linux-azure-nvidia | — | 6.8.0-1029.32 |
| linux-azure-nvidia-6.14 | — | 6.14.0-1007.7 |
| linux-bluefield | — | — |
| linux-fips | — | 6.8.0-86.87+fips1 |
| linux-gcp | — | 6.8.0-1042.45 |
| linux-gcp-5.11 | — | — |
| linux-gcp-5.13 | — | — |
| linux-gcp-5.19 | — | — |
| linux-gcp-5.3 | — | — |
| linux-gcp-5.8 | — | — |
| linux-gcp-6.11 | — | — |
| linux-gcp-6.14 | — | 6.14.0-1018.19~24.04.1 |
| linux-gcp-6.2 | — | — |
| linux-gcp-6.5 | — | — |
| linux-gcp-6.8 | — | 6.8.0-1042.45~22.04.1 |
| linux-gcp-fips | — | 6.8.0-1042.45+fips1 |
| linux-gke | — | 6.8.0-1038.43 |
| linux-gke-4.15 | — | — |
| linux-gke-5.15 | — | — |
| linux-gke-5.4 | — | — |
| linux-gkeop | — | 6.8.0-1025.28 |
| linux-gkeop-5.15 | — | — |
| linux-gkeop-5.4 | — | — |
| linux-hwe | — | — |
| linux-hwe-5.11 | — | — |
| linux-hwe-5.13 | — | — |
| linux-hwe-5.19 | — | — |
| linux-hwe-5.8 | — | — |
| linux-hwe-6.11 | — | — |
| linux-hwe-6.2 | — | — |
| linux-hwe-6.5 | — | — |
| linux-hwe-6.8 | — | 6.8.0-86.87~22.04.1 |
| linux-hwe-edge | — | — |
| linux-ibm | — | 6.8.0-1039.39 |
| linux-ibm-6.8 | — | 6.8.0-1039.39~22.04.1 |
| linux-intel | — | — |
| linux-intel-5.13 | — | — |
| linux-intel-iot-realtime | — | — |
| linux-lowlatency | — | 6.8.0-86.87.1 |
| 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 | — | 6.8.0-86.87.1~22.04.1 |
| linux-nvidia | — | 6.8.0-1041.44 |
| linux-nvidia-6.11 | — | — |
| linux-nvidia-6.2 | — | — |
| linux-nvidia-6.5 | — | — |
| linux-nvidia-6.8 | — | 6.8.0-1041.44~22.04.2 |
| linux-nvidia-lowlatency | — | 6.8.0-1041.44.1 |
| linux-nvidia-tegra | — | 6.8.0-1012.12 |
| 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 | — | 6.14.0-1014.14 |
| linux-oem-6.5 | — | — |
| linux-oem-6.8 | — | — |
| linux-oracle | — | 6.8.0-1038.39 |
| linux-oracle-5.0 | — | — |
| linux-oracle-5.11 | — | — |
| linux-oracle-5.13 | — | — |
| linux-oracle-5.3 | — | — |
| linux-oracle-5.8 | — | — |
| linux-oracle-6.14 | — | 6.14.0-1015.15~24.04.1 |
| linux-oracle-6.5 | — | — |
| linux-oracle-6.8 | — | 6.8.0-1038.39~22.04.1 |
| linux-raspi | — | 6.8.0-1041.45 |
| linux-raspi-realtime | — | 6.8.0-2032.33 |
| linux-raspi2 | — | — |
| linux-realtime | — | 6.8.1-1036.37 |
| linux-realtime-6.14 | — | 6.14.0-1014.14~24.04.1 |
| linux-realtime-6.8 | — | 6.8.1-1036.37~22.04.1 |
| linux-riscv | — | — |
| linux-riscv-5.11 | — | — |
| linux-riscv-5.19 | — | — |
| linux-riscv-5.8 | — | — |
| linux-riscv-6.14 | — | 6.14.0-34.34.1~24.04.1 |
| linux-riscv-6.5 | — | — |
| linux-riscv-6.8 | — | 6.8.0-86.87~22.04.1 |
| linux-starfive-5.19 | — | — |
| linux-starfive-6.2 | — | — |
| linux-starfive-6.5 | — | — |
| linux-xilinx | — | 6.8.0-1018.19 |
References
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Exploit Protection
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