CVE-2025-68776: Linux kernel · net/hsr: fix NULL pointer dereference in prp_get_untagged_frame()
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 5.15.0-1103.110~20.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 10:12 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.15.0-1103.110~20.04.1, 5.15.0-1110.119~20.04.1, 5.15.0-1103.112~20.04.1 +70
Exploitation evidence
Disclosed: evidence found.
CVE published 13 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 25.10linuxpkg:deb/ubuntu/linux@6.17.0-22.22?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-awspkg:deb/ubuntu/linux-aws@6.17.0-1012.12?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azurepkg:deb/ubuntu/linux-azure@6.17.0-1013.13?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde@6.17.0-1017.17?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-gcppkg:deb/ubuntu/linux-gcp@6.17.0-1012.12?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-oraclepkg:deb/ubuntu/linux-oracle@6.17.0-1011.11?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
An official fix is available and has been released in updated Linux kernel packages for linux-aws. Users should apply the vendor-provided kernel updates to remediate this vulnerability. No additional mitigation steps are required beyond applying the patch.
Description
A NULL pointer dereference vulnerability in the Linux kernel's net/hsr subsystem was fixed. The flaw occurs in the function prp_get_untagged_frame(), which calls __pskb_copy() without checking for allocation failure. If __pskb_copy() returns NULL, a subsequent call to skb_clone() with a NULL pointer causes a kernel crash (general protection fault). This issue has been addressed by adding a NULL check after __pskb_copy() to prevent crashes. The vulnerability affects multiple linux-aws kernel versions prior to specific patched releases. A fix is available as part of the Linux kernel updates.
References
- ubuntu.com/security/CVE-2025-68776 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2025-68776 (opens in a new tab)
- git.kernel.org/linus/188e0fa5a679570ea35474575e724d8211423d17 (opens in a new tab)
- git.kernel.org/stable/c/1742974c24a9c1f1fd2e5edca0cbaccb720b397a (opens in a new tab)
- git.kernel.org/stable/c/188e0fa5a679570ea35474575e724d8211423d17 (opens in a new tab)
- git.kernel.org/stable/c/6220d38a08f8837575cd8f830928b49a3a5a5095 (opens in a new tab)
- git.kernel.org/stable/c/7be6d25f4d974e44918ba3a5d58ebb9d36879087 (opens in a new tab)
- git.kernel.org/stable/c/8f289fa12926aae44347ca7d490e216555d8f255 (opens in a new tab)
- ubuntu.com/security/notices/USN-8096-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8096-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8096-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8096-4 (opens in a new tab)
- ubuntu.com/security/notices/USN-8116-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8096-5 (opens in a new tab)
- ubuntu.com/security/notices/USN-8141-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8163-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8163-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8177-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8179-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8177-2 (opens in a new tab)