In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_netem: fix out-of-bounds access in packet corruption In… (CVE-2026-31675)
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_netem: fix out-of-bounds access in packet corruption In netem_enqueue(), the packet corruption logic uses get_random_u32_below(skb_headlen(skb)) to select an index for modifying skb->data. When an AF_PACKET TX_RING sends fully non-linear packets over an IPIP tunnel, skb_headlen(skb) evaluates to 0. Passing 0 to get_random_u32_below() takes the variable-ceil slow path which returns an unconstrained 32-bit random integer. Using this unconstrained value as an offset into skb->data results in an out-of-bounds memory access. Fix this by verifying skb_headlen(skb) is non-zero before attempting to corrupt the linear data area. Fully non-linear packets will silently bypass the corruption logic.
AI Analysis
Technical Summary
The Linux kernel vulnerability CVE-2026-31675 involves an out-of-bounds memory access in the netem packet scheduler's packet corruption logic. Specifically, in netem_enqueue(), the function get_random_u32_below() is called with skb_headlen(skb) as the upper bound to select an index for modifying skb->data. When fully non-linear packets are sent over an IPIP tunnel using AF_PACKET TX_RING, skb_headlen(skb) evaluates to zero. Passing zero to get_random_u32_below() triggers a slow path that returns an unconstrained 32-bit random integer, which is then used as an offset into skb->data, causing out-of-bounds access. The fix ensures skb_headlen(skb) is non-zero before attempting corruption, bypassing fully non-linear packets safely. This vulnerability affects several Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and related builds. The vendor has released patches to address this issue, and users are advised to update and reboot their systems.
Potential Impact
The vulnerability allows out-of-bounds memory access, which can lead to corruption of kernel memory, potentially causing system crashes or allowing an attacker with local privileges to compromise system confidentiality, integrity, and availability. The CVSS 3.1 score of 7.8 reflects high impact on confidentiality, integrity, and availability. However, exploitation requires local privileges and user interaction is not required. No known exploits are currently reported in the wild.
Mitigation Recommendations
A patch is available from the vendor and should be applied promptly. The vendor advisory indicates that after applying the update, a system reboot is necessary due to ABI changes in the kernel. Users should update their Linux kernel packages to versions 6.8.0-1061.64~22.04.1 or later (and related patched versions) as provided by their distribution. No additional mitigation steps are indicated beyond applying the official fix and rebooting.
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_netem: fix out-of-bounds access in packet corruption In… (CVE-2026-31675)
Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_netem: fix out-of-bounds access in packet corruption In netem_enqueue(), the packet corruption logic uses get_random_u32_below(skb_headlen(skb)) to select an index for modifying skb->data. When an AF_PACKET TX_RING sends fully non-linear packets over an IPIP tunnel, skb_headlen(skb) evaluates to 0. Passing 0 to get_random_u32_below() takes the variable-ceil slow path which returns an unconstrained 32-bit random integer. Using this unconstrained value as an offset into skb->data results in an out-of-bounds memory access. Fix this by verifying skb_headlen(skb) is non-zero before attempting to corrupt the linear data area. Fully non-linear packets will silently bypass the corruption logic.
CVSS v3.1
Score 7.8high
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg: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
The Linux kernel vulnerability CVE-2026-31675 involves an out-of-bounds memory access in the netem packet scheduler's packet corruption logic. Specifically, in netem_enqueue(), the function get_random_u32_below() is called with skb_headlen(skb) as the upper bound to select an index for modifying skb->data. When fully non-linear packets are sent over an IPIP tunnel using AF_PACKET TX_RING, skb_headlen(skb) evaluates to zero. Passing zero to get_random_u32_below() triggers a slow path that returns an unconstrained 32-bit random integer, which is then used as an offset into skb->data, causing out-of-bounds access. The fix ensures skb_headlen(skb) is non-zero before attempting corruption, bypassing fully non-linear packets safely. This vulnerability affects several Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and related builds. The vendor has released patches to address this issue, and users are advised to update and reboot their systems.
Potential Impact
The vulnerability allows out-of-bounds memory access, which can lead to corruption of kernel memory, potentially causing system crashes or allowing an attacker with local privileges to compromise system confidentiality, integrity, and availability. The CVSS 3.1 score of 7.8 reflects high impact on confidentiality, integrity, and availability. However, exploitation requires local privileges and user interaction is not required. No known exploits are currently reported in the wild.
Mitigation Recommendations
A patch is available from the vendor and should be applied promptly. The vendor advisory indicates that after applying the update, a system reboot is necessary due to ABI changes in the kernel. Users should update their Linux kernel packages to versions 6.8.0-1061.64~22.04.1 or later (and related patched versions) as provided by their distribution. No additional mitigation steps are indicated beyond applying the official fix and rebooting.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-31675
- Osv Schema Version
- 1.7.0
- 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"]
- Cvss Version
- 4.0
Threat ID: 6a5b61c02d1edb114c885775
Added to database: 07/18/2026, 11:21:36 UTC
Last enriched: 08/01/2026, 05:00:36 UTC
Last updated: 09/14/2026, 22:01:33 UTC
Views: 21
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