Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: tun: free page on short-frame rejection in tun_xdp_one() tun_xdp_one() returns…
A vulnerability in the Linux kernel's tun driver causes a memory leak when processing short frames in the tun_xdp_one() function. Specifically, the function returns an error on frames shorter than the Ethernet header length without freeing allocated memory, leading to page-fragment leaks. A local user with access to /dev/net/tun and /dev/vhost-net can exploit this by sending crafted short frames, causing memory exhaustion and potential out-of-memory (OOM) panics.
AI Analysis
Technical Summary
The Linux kernel's tun driver had a flaw in tun_xdp_one() where it returned -EINVAL on frames shorter than ETH_HLEN without freeing the allocated page. The caller vhost_net_build_xdp() expects the page to be freed on error, but tun_sendmsg() ignores the error and returns success, causing vhost_tx_batch() to skip freeing the page. This results in a memory leak of page-frag chunks for each short frame in a batch. A local attacker with access to /dev/net/tun and /dev/vhost-net can repeatedly submit short TX descriptors to exhaust host memory and trigger an OOM panic. The fix involves freeing the page before returning -EINVAL, aligning with the error handling path for XDP programs.
Potential Impact
A local attacker with permissions to open /dev/net/tun and /dev/vhost-net can cause a denial of service by exhausting system memory through repeated submission of short frames that trigger a memory leak. This can lead to an out-of-memory panic, potentially disrupting system availability.
Mitigation Recommendations
A fix is available for this vulnerability as indicated by the resolved status in the Linux kernel. Users should update affected Linux kernel versions to the fixed releases at or beyond 7.0.0-28.28~24.04.1, 7.0.0-28.28, 7.0.0-1009.9, and 7.0.0-1010.10. Until patched, restrict local access to /dev/net/tun and /dev/vhost-net to trusted users only to prevent exploitation.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: tun: free page on short-frame rejection in tun_xdp_one() tun_xdp_one() returns…
Description
A vulnerability in the Linux kernel's tun driver causes a memory leak when processing short frames in the tun_xdp_one() function. Specifically, the function returns an error on frames shorter than the Ethernet header length without freeing allocated memory, leading to page-fragment leaks. A local user with access to /dev/net/tun and /dev/vhost-net can exploit this by sending crafted short frames, causing memory exhaustion and potential out-of-memory (OOM) panics.
CVSS v4.0
Affected software
pkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.2?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]+cvm1.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.3?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email 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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=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? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's tun driver had a flaw in tun_xdp_one() where it returned -EINVAL on frames shorter than ETH_HLEN without freeing the allocated page. The caller vhost_net_build_xdp() expects the page to be freed on error, but tun_sendmsg() ignores the error and returns success, causing vhost_tx_batch() to skip freeing the page. This results in a memory leak of page-frag chunks for each short frame in a batch. A local attacker with access to /dev/net/tun and /dev/vhost-net can repeatedly submit short TX descriptors to exhaust host memory and trigger an OOM panic. The fix involves freeing the page before returning -EINVAL, aligning with the error handling path for XDP programs.
Potential Impact
A local attacker with permissions to open /dev/net/tun and /dev/vhost-net can cause a denial of service by exhausting system memory through repeated submission of short frames that trigger a memory leak. This can lead to an out-of-memory panic, potentially disrupting system availability.
Mitigation Recommendations
A fix is available for this vulnerability as indicated by the resolved status in the Linux kernel. Users should update affected Linux kernel versions to the fixed releases at or beyond 7.0.0-28.28~24.04.1, 7.0.0-28.28, 7.0.0-1009.9, and 7.0.0-1010.10. Until patched, restrict local access to /dev/net/tun and /dev/vhost-net to trusted users only to prevent exploitation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46321
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField: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: 6a5a018591ae9bcd3f804950
Added to database: 07/17/2026, 10:18:45 UTC
Last enriched: 07/30/2026, 15:09:28 UTC
Last updated: 07/31/2026, 19:24:47 UTC
Views: 1
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