Linux aws: In the Linux kernel, the following vulnerability has been resolved: net: pull headers in qdisc_pkt_len_segs_init() Most ndo_start_xmit() methods…
A vulnerability in the Linux kernel's network stack related to the handling of generic segmentation offload (GSO) packets has been resolved. The issue involves improper assumptions about packet headers in ndo_start_xmit() methods, particularly affecting net/core/tso.c where memcpy operations rely on header data. The fix ensures proper header pulling using pskb_may_pull() and introduces early detection and dropping of malformed packets with a new drop reason. This vulnerability affects multiple Ubuntu Linux kernel versions prior to specific 7.0.0-xx releases.
AI Analysis
Technical Summary
This Linux kernel vulnerability concerns the network subsystem's handling of GSO packets. Most ndo_start_xmit() methods expect GSO packet headers to be present in skb->head, but some drivers may not handle this correctly. The vulnerable code in net/core/tso.c uses memcpy to copy header data without ensuring the headers are fully pulled into the linear skb area. The patch replaces skb_header_pointer() with pskb_may_pull() to guarantee headers are accessible, preventing potential misuse of malformed packets. Additionally, a new SKB_DROP_REASON_SKB_BAD_GSO drop reason was introduced to detect and drop malicious packets earlier in the processing pipeline. The vulnerability affects Linux kernel versions used in various Ubuntu releases prior to 7.0.0-28.28~24.04.1, 7.0.0-28.28, 7.0.0-1009.9, and 7.0.0-1010.10.
Potential Impact
The vulnerability could allow malformed GSO packets to be processed incorrectly by the kernel's network stack, potentially leading to memory corruption or other unintended behavior. This could impact system stability or security, especially in network-intensive environments. The CVSS 4.0 vector indicates a local attack vector with low complexity, no user interaction, and high impact on availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available in Linux kernel versions 7.0.0-28.28~24.04.1, 7.0.0-28.28, 7.0.0-1009.9, and 7.0.0-1010.10 and later. Users should update their Linux kernel to these or newer patched versions to mitigate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Linux aws: In the Linux kernel, the following vulnerability has been resolved: net: pull headers in qdisc_pkt_len_segs_init() Most ndo_start_xmit() methods…
Description
A vulnerability in the Linux kernel's network stack related to the handling of generic segmentation offload (GSO) packets has been resolved. The issue involves improper assumptions about packet headers in ndo_start_xmit() methods, particularly affecting net/core/tso.c where memcpy operations rely on header data. The fix ensures proper header pulling using pskb_may_pull() and introduces early detection and dropping of malformed packets with a new drop reason. This vulnerability affects multiple Ubuntu Linux kernel versions prior to specific 7.0.0-xx releases.
CVSS v4.0
Affected software
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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This Linux kernel vulnerability concerns the network subsystem's handling of GSO packets. Most ndo_start_xmit() methods expect GSO packet headers to be present in skb->head, but some drivers may not handle this correctly. The vulnerable code in net/core/tso.c uses memcpy to copy header data without ensuring the headers are fully pulled into the linear skb area. The patch replaces skb_header_pointer() with pskb_may_pull() to guarantee headers are accessible, preventing potential misuse of malformed packets. Additionally, a new SKB_DROP_REASON_SKB_BAD_GSO drop reason was introduced to detect and drop malicious packets earlier in the processing pipeline. The vulnerability affects Linux kernel versions used in various Ubuntu releases prior to 7.0.0-28.28~24.04.1, 7.0.0-28.28, 7.0.0-1009.9, and 7.0.0-1010.10.
Potential Impact
The vulnerability could allow malformed GSO packets to be processed incorrectly by the kernel's network stack, potentially leading to memory corruption or other unintended behavior. This could impact system stability or security, especially in network-intensive environments. The CVSS 4.0 vector indicates a local attack vector with low complexity, no user interaction, and high impact on availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available in Linux kernel versions 7.0.0-28.28~24.04.1, 7.0.0-28.28, 7.0.0-1009.9, and 7.0.0-1010.10 and later. Users should update their Linux kernel to these or newer patched versions to mitigate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53091
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS: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"]
- Database Specific Severity
- null
- Cvss Version
- 4.0
Threat ID: 6a5a013091ae9bcd3f80171f
Added to database: 07/17/2026, 10:17:20 UTC
Last enriched: 07/30/2026, 21:37:37 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 2
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