In the Linux kernel, the following vulnerability has been resolved: batman-adv: dat: handle forward allocation error batadv_dat_forward_data() calls… (CVE-2026-52922)
In the Linux kernel, the following vulnerability has been resolved: batman-adv: dat: handle forward allocation error batadv_dat_forward_data() calls pskb_copy_for_clone() to duplicate an skb for each DHT candidate, but does not check the return value before passing it to batadv_send_skb_prepare_unicast_4addr(). That function dereferences the skb unconditionally, so a failed allocation triggers a NULL pointer dereference. Skip forwarding to the current DHT candidate on allocation failure.
AI Analysis
Technical Summary
The Linux kernel's batman-adv module contained a vulnerability where the function batadv_dat_forward_data() did not verify the success of skb duplication via pskb_copy_for_clone() before passing the skb to batadv_send_skb_prepare_unicast_4addr(). Since the latter function dereferences the skb unconditionally, a failed allocation results in a NULL pointer dereference. The vulnerability is addressed by adding a check to skip forwarding to the current DHT candidate if the skb allocation fails.
Potential Impact
This vulnerability can cause a denial of service (DoS) due to a NULL pointer dereference in the batman-adv module of the Linux kernel. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
A fix is available in Linux kernel versions 5.15.0-1112.119~20.04.1 and later. Users should update to these or newer patched kernel versions to remediate this issue. Since this is not a cloud service, remediation requires applying the kernel update. Patch status is confirmed by the affectedVersions field indicating fixed versions at or above 5.15.0-1112.119~20.04.1.
In the Linux kernel, the following vulnerability has been resolved: batman-adv: dat: handle forward allocation error batadv_dat_forward_data() calls… (CVE-2026-52922)
Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: dat: handle forward allocation error batadv_dat_forward_data() calls pskb_copy_for_clone() to duplicate an skb for each DHT candidate, but does not check the return value before passing it to batadv_send_skb_prepare_unicast_4addr(). That function dereferences the skb unconditionally, so a failed allocation triggers a NULL pointer dereference. Skip forwarding to the current DHT candidate on allocation failure.
CVSS v3.1
Score 7.5high
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
The Linux kernel's batman-adv module contained a vulnerability where the function batadv_dat_forward_data() did not verify the success of skb duplication via pskb_copy_for_clone() before passing the skb to batadv_send_skb_prepare_unicast_4addr(). Since the latter function dereferences the skb unconditionally, a failed allocation results in a NULL pointer dereference. The vulnerability is addressed by adding a check to skip forwarding to the current DHT candidate if the skb allocation fails.
Potential Impact
This vulnerability can cause a denial of service (DoS) due to a NULL pointer dereference in the batman-adv module of the Linux kernel. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
A fix is available in Linux kernel versions 5.15.0-1112.119~20.04.1 and later. Users should update to these or newer patched kernel versions to remediate this issue. Since this is not a cloud service, remediation requires applying the kernel update. Patch status is confirmed by the affectedVersions field indicating fixed versions at or above 5.15.0-1112.119~20.04.1.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-52922
- 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
- 3.1
Threat ID: 6a5a017991ae9bcd3f804528
Added to database: 07/17/2026, 10:18:33 UTC
Last enriched: 07/30/2026, 15:23:31 UTC
Last updated: 07/31/2026, 21:28:58 UTC
Views: 3
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