CVE-2026-53337: Linux kernel · net: bonding: fix NULL pointer dereference in bond_do_ioctl()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in c2cfe290fdb1c32a4f4eb2b8ca3f363b305d21ba : update Linux kernel when convenient.
Data as of 6 Nov 2026, 16:49 UTC
Rated by Threat Radar · 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, 2026-11-06.
- Patch
- Available – fixed in c2cfe290fdb1c32a4f4eb2b8ca3f363b305d21ba, bcb8fad90f27300add583a8371db504b766d95c7, b0878106ddc486375084145848ff255dedfff46a +5
Exploitation evidence
Disclosed: evidence found.
CVE published 1 Jul 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 6 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
|
Description
In the Linux kernel, the following vulnerability has been resolved: net: bonding: fix NULL pointer dereference in bond_do_ioctl() In bond_do_ioctl(), slave_dev is obtained via __dev_get_by_name() which can return NULL if the requested interface name does not exist. However, the subsequent slave_dbg() call is placed before the NULL check: slave_dev = __dev_get_by_name(net, ifr->ifr_slave); slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); //here if (!slave_dev) return -ENODEV; The slave_dbg() macro expands to netdev_dbg(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ...) which unconditionally dereferences slave_dev->name before the NULL check is performed. This results in a NULL pointer dereference kernel oops when a user calls bonding ioctl (e.g. SIOCBONDENSLAVE, SIOCBONDRELEASE, etc.) with a non-existent slave interface name. This is reachable from userspace via the bonding ioctl interface with CAP_NET_ADMIN capability, making it a potential local denial-of-service vector. Fix by moving the slave_dbg() call after the NULL check.
References
- git.kernel.org/stable/c/1b7558c85493467b2ea20738866b822db6442034 (opens in a new tab)
- git.kernel.org/stable/c/b02b2e3e876c18733b868a29064abd11cdbf8feb (opens in a new tab)
- git.kernel.org/stable/c/66693957bacd1c9dae6188a7312d6be69a221f2d (opens in a new tab)
- git.kernel.org/stable/c/a629418d463fb50d132a1aa063b0105857311e5f (opens in a new tab)
- git.kernel.org/stable/c/c2cfe290fdb1c32a4f4eb2b8ca3f363b305d21ba (opens in a new tab)
- git.kernel.org/stable/c/bcb8fad90f27300add583a8371db504b766d95c7 (opens in a new tab)
- git.kernel.org/stable/c/b0878106ddc486375084145848ff255dedfff46a (opens in a new tab)
- git.kernel.org/stable/c/a764b0e8317a863006e05732e1aefe821b9d8c2d (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)