CVE-2025-68787: Linux kernel · netrom: Fix memory leak in nr_sendmsg()
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, 17:16 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 +74
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?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-oraclepkg:deb/ubuntu/linux-oracle?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
A patch is available and has been applied in updated Linux kernel versions as indicated by the affected version ranges. Users should update their Linux kernel to versions newer than the affected ones to remediate this memory leak. No additional mitigation steps are required.
Description
A memory leak vulnerability in the Linux kernel's netrom subsystem was fixed. The issue occurred when the function sock_alloc_send_skb() returned NULL in nr_output(), causing the originally allocated socket buffer (skb) in nr_sendmsg() not to be freed. This could lead to memory leaks. The vulnerability has been addressed by freeing the skb before returning. The fix is included in updated Linux kernel versions.
References
- ubuntu.com/security/CVE-2025-68787 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2025-68787 (opens in a new tab)
- git.kernel.org/linus/613d12dd794e078be8ff3cf6b62a6b9acf7f4619 (opens in a new tab)
- git.kernel.org/stable/c/156a0f6341dce634a825db49ca20b48b1ae9bcc1 (opens in a new tab)
- git.kernel.org/stable/c/51f5fbc1681bdcffcc7d18bf3dfdb2b1278d3977 (opens in a new tab)
- git.kernel.org/stable/c/613d12dd794e078be8ff3cf6b62a6b9acf7f4619 (opens in a new tab)
- git.kernel.org/stable/c/73839497bbde5cd4fd02bbd9c8bc2640780ae65d (opens in a new tab)
- git.kernel.org/stable/c/8d1ccba4b171cd504ecfa47349cb9864fc9d687c (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)