Linux azure: In the Linux kernel, the following vulnerability has been resolved: net: use skb_header_pointer() for TCPv4 GSO frag_off check Syzbot reported a… (CVE-2026-43036)
A vulnerability in the Linux kernel's networking code related to TCPv4 Generic Segmentation Offload (GSO) frag_off checks was resolved. The issue involved unsafe direct dereferencing of IPv4 header offsets in packets injected from PF_PACKET paths, which could lead to uninitialized memory reads. This was fixed by using skb_header_pointer() to safely access the header data. The vulnerability affects multiple linux-azure kernel versions prior to 6.8.0-1061.64~22.04.1 and similar builds. A patch is available and should be applied via standard system updates.
AI Analysis
Technical Summary
CVE-2026-43036 addresses a Linux kernel vulnerability where the function gso_features_check() reads the IPv4 header's frag_off field using ip_hdr()/inner_ip_hdr(), which can rely on skb header offsets unsafe for direct dereference on packets injected from PF_PACKET paths. This can cause uninitialized memory reads detected by KMSAN. The fix replaces direct header access with skb_header_pointer(), ensuring safe and robust header reads regardless of data linearity. The vulnerability affects linux-azure kernel versions prior to 6.8.0-1061.64~22.04.1 and related builds. The issue was reported by Syzbot and fixed in official Ubuntu kernel updates as detailed in USN-8567-1 and USN-8574-1 advisories.
Potential Impact
The vulnerability can cause the kernel to read uninitialized memory when processing certain network packets, potentially leading to denial of service (kernel crash) due to memory safety violations. There is no indication of confidentiality or integrity impact. The CVSS score is 5.5 (medium severity) with an impact vector indicating no confidentiality or integrity loss but high availability impact. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and included in official Ubuntu linux-azure kernel updates (e.g., versions 6.8.0-1061.64~22.04.1 and later). Users should apply the latest kernel updates and reboot to ensure the fix is active. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled after updating. No additional mitigations are required beyond applying the official kernel update.
Linux azure: In the Linux kernel, the following vulnerability has been resolved: net: use skb_header_pointer() for TCPv4 GSO frag_off check Syzbot reported a… (CVE-2026-43036)
Description
A vulnerability in the Linux kernel's networking code related to TCPv4 Generic Segmentation Offload (GSO) frag_off checks was resolved. The issue involved unsafe direct dereferencing of IPv4 header offsets in packets injected from PF_PACKET paths, which could lead to uninitialized memory reads. This was fixed by using skb_header_pointer() to safely access the header data. The vulnerability affects multiple linux-azure kernel versions prior to 6.8.0-1061.64~22.04.1 and similar builds. A patch is available and should be applied via standard system updates.
CVSS v3.1
Score 5.5medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-43036 addresses a Linux kernel vulnerability where the function gso_features_check() reads the IPv4 header's frag_off field using ip_hdr()/inner_ip_hdr(), which can rely on skb header offsets unsafe for direct dereference on packets injected from PF_PACKET paths. This can cause uninitialized memory reads detected by KMSAN. The fix replaces direct header access with skb_header_pointer(), ensuring safe and robust header reads regardless of data linearity. The vulnerability affects linux-azure kernel versions prior to 6.8.0-1061.64~22.04.1 and related builds. The issue was reported by Syzbot and fixed in official Ubuntu kernel updates as detailed in USN-8567-1 and USN-8574-1 advisories.
Potential Impact
The vulnerability can cause the kernel to read uninitialized memory when processing certain network packets, potentially leading to denial of service (kernel crash) due to memory safety violations. There is no indication of confidentiality or integrity impact. The CVSS score is 5.5 (medium severity) with an impact vector indicating no confidentiality or integrity loss but high availability impact. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and included in official Ubuntu linux-azure kernel updates (e.g., versions 6.8.0-1061.64~22.04.1 and later). Users should apply the latest kernel updates and reboot to ensure the fix is active. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled after updating. No additional mitigations are required beyond applying the official kernel update.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-43036
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6a5a037e91ae9bcd3f855223
Added to database: 07/17/2026, 10:27:10 UTC
Last enriched: 08/01/2026, 23:17:07 UTC
Last updated: 09/14/2026, 22:01:34 UTC
Views: 25
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