CVE-2026-31546: Linux kernel · net: bonding: fix NULL deref in bond_debug_rlb_hash_show
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in edacf1613f7b26423ebfa8b2892e7453c4235354 : update Linux kernel when convenient.
Data as of 5 Nov 2026, 22:06 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-05.
- Patch
- Available – fixed in edacf1613f7b26423ebfa8b2892e7453c4235354, ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466c, 605b52497bf89b3b154674deb135da98f916e390 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Apr 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 5 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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AI-suggested
A fix is available and has been applied in multiple Linux kernel commits. Users should update to a Linux kernel version that includes these fixes. Since this is a kernel-level issue, applying the official kernel patches or upgrading to a fixed kernel release will remediate the vulnerability.
Description
A NULL pointer dereference vulnerability exists in the Linux kernel bonding driver in the bond_debug_rlb_hash_show function. This occurs because the function accesses a slave pointer without checking if it is NULL, leading to a kernel crash. The issue arises when the RLB hash-table entries have a NULL slave due to no replacement slave being available. The vulnerability has been fixed by adding a NULL check and printing "(none)" for entries without an assigned slave.
References
- git.kernel.org/stable/c/19f0fd87df0e5746b24f5caa465a66a8c6e6e241 (opens in a new tab)
- git.kernel.org/stable/c/edacf1613f7b26423ebfa8b2892e7453c4235354 (opens in a new tab)
- git.kernel.org/stable/c/2ec2c777f357a83c3d503d8d9370c90b60f0ae63 (opens in a new tab)
- git.kernel.org/stable/c/0a3f8cd3f370247ded14d38d216b49dd30eade76 (opens in a new tab)
- git.kernel.org/stable/c/6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4 (opens in a new tab)
- git.kernel.org/stable/c/017d674cf6930e9586a29ee808c7ca09d1396d07 (opens in a new tab)
- git.kernel.org/stable/c/ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466c (opens in a new tab)
- git.kernel.org/stable/c/605b52497bf89b3b154674deb135da98f916e390 (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-082556.html (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)