CVE-2025-68787: Linux kernel · netrom: Fix memory leak in nr_sendmsg()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f77e538ac4e3adb1882d5bccb7bfdc111b5963d3 : update Linux kernel when convenient.
Data as of 10 Nov 2026, 13:18 UTC
Rated Low by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- Patch
- Available – fixed in f77e538ac4e3adb1882d5bccb7bfdc111b5963d3, 73839497bbde5cd4fd02bbd9c8bc2640780ae65d, 613d12dd794e078be8ff3cf6b62a6b9acf7f4619 +4
Exploitation evidence
Disclosed: evidence found.
CVE published 13 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 10 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
AI-suggested
The vulnerability has been fixed in the Linux kernel. Users and administrators should apply the official patches or update to a fixed kernel version containing the listed commits. Since this is a memory leak fix, no additional mitigation steps are necessary beyond applying the patch.
Description
A memory leak vulnerability was identified and fixed in the Linux kernel's netrom module in the nr_sendmsg() function. The issue occurs when sock_alloc_send_skb() returns NULL in nr_output(), causing the originally allocated socket buffer (skb) not to be freed. This flaw was reported by syzbot and has been addressed by freeing the skb before returning.
References
- git.kernel.org/stable/c/f77e538ac4e3adb1882d5bccb7bfdc111b5963d3 (opens in a new tab)
- git.kernel.org/stable/c/09efbf54eeaecebe882af603c9939a4b1bb9567e (opens in a new tab)
- git.kernel.org/stable/c/73839497bbde5cd4fd02bbd9c8bc2640780ae65d (opens in a new tab)
- git.kernel.org/stable/c/156a0f6341dce634a825db49ca20b48b1ae9bcc1 (opens in a new tab)
- git.kernel.org/stable/c/8d1ccba4b171cd504ecfa47349cb9864fc9d687c (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)
- cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)