CVE-2026-53337 - Vulnerability Details

- net: bonding: fix NULL pointer dereference in bond_do_ioctl()

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.

Published: 2026-07-01

Score: 5.5 Medium

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

A occurs in the Linux bonding driver during the bond_do_ioctl() call when a debug routine accesses the name field of a slave device pointer that may be NULL. The flaw can be triggered by user‑space code that issues bonding ioctl commands with a non‑existent slave interface name, causing a kernel crash (oops) and a local denial of service. The weakness is a classic null‑pointer dereference (CWE‑476).

Affected Systems

All Linux kernel builds that include the generic bonding driver and expose the bonding ioctl interface are potentially vulnerable; the issue applies to any distribution with an unmodified driver, regardless of release version.

Risk and Exploitability

The vulnerability is reachable locally from user space via bonding ioctl commands such as SIOCBONDENSLAVE or SIOCBONDRELEASE when a non‑existent slave interface name supplied. An attacker must possess CAP_NET_ADMIN privileges, making the attack vector terrestrial and privileged. The CVSS score of 5.5 indicates moderate severity, 0.16% shows a very low exploitation probability. It is not listed in the CISA KEV catalog. The impact of a kernel crash is an immediate, complete denial of service for the affected system.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`e2a7420df2e01370b40e4cf7b85ab9a885c6d755`	affected	< 1b7558c85493467b2ea20738866b822db6442034
`e2a7420df2e01370b40e4cf7b85ab9a885c6d755`	affected	< b02b2e3e876c18733b868a29064abd11cdbf8feb
`e2a7420df2e01370b40e4cf7b85ab9a885c6d755`	affected	< 66693957bacd1c9dae6188a7312d6be69a221f2d
`e2a7420df2e01370b40e4cf7b85ab9a885c6d755`	affected	< a629418d463fb50d132a1aa063b0105857311e5f
`e2a7420df2e01370b40e4cf7b85ab9a885c6d755`	affected	< c2cfe290fdb1c32a4f4eb2b8ca3f363b305d21ba
`e2a7420df2e01370b40e4cf7b85ab9a885c6d755`	affected	< bcb8fad90f27300add583a8371db504b766d95c7
`e2a7420df2e01370b40e4cf7b85ab9a885c6d755`	affected	< b0878106ddc486375084145848ff255dedfff46a
`e2a7420df2e01370b40e4cf7b85ab9a885c6d755`	affected	< a764b0e8317a863006e05732e1aefe821b9d8c2d

Linux

affected

Version	Status	Constraints
`5.3`	affected	—
`0`	unaffected	< 5.3
`5.10.259`	unaffected	≤ 5.10.*
`5.15.210`	unaffected	≤ 5.15.*
`6.1.176`	unaffected	≤ 6.1.*
`6.6.143`	unaffected	≤ 6.6.*
`6.12.94`	unaffected	≤ 6.12.*
`6.18.36`	unaffected	≤ 6.18.*
`7.0.13`	unaffected	≤ 7.0.*
`7.1`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[e2a7420df2e01370b40e4cf7b85ab9a885c6d755,1b7558c85493467b2ea20738866b822db6442034)`	affected	code_commit	—
`[e2a7420df2e01370b40e4cf7b85ab9a885c6d755,b02b2e3e876c18733b868a29064abd11cdbf8feb)`	affected	code_commit	—
`[e2a7420df2e01370b40e4cf7b85ab9a885c6d755,66693957bacd1c9dae6188a7312d6be69a221f2d)`	affected	code_commit	—
`[e2a7420df2e01370b40e4cf7b85ab9a885c6d755,a629418d463fb50d132a1aa063b0105857311e5f)`	affected	code_commit	—
`[e2a7420df2e01370b40e4cf7b85ab9a885c6d755,c2cfe290fdb1c32a4f4eb2b8ca3f363b305d21ba)`	affected	code_commit	—
`[e2a7420df2e01370b40e4cf7b85ab9a885c6d755,bcb8fad90f27300add583a8371db504b766d95c7)`	affected	code_commit	—
`[e2a7420df2e01370b40e4cf7b85ab9a885c6d755,b0878106ddc486375084145848ff255dedfff46a)`	affected	code_commit	—
`[e2a7420df2e01370b40e4cf7b85ab9a885c6d755,a764b0e8317a863006e05732e1aefe821b9d8c2d)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`5.3`	affected	generic	—
`[0,5.3)`	unaffected	generic	—
`[5.10.259,5.11.0)`	unaffected	semver	—
`[5.15.210,5.16.0)`	unaffected	semver	—
`[6.1.176,6.2.0)`	unaffected	semver	—
`[6.6.143,6.7.0)`	unaffected	semver	—
`[6.12.94,6.13.0)`	unaffected	semver	—
`[6.18.36,6.19.0)`	unaffected	semver	—
`[7.0.13,7.1.0)`	unaffected	semver	—
`[7.1,*]`	unaffected	generic	—

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Apply a Linux kernel update that includes the commit moving the debug call after the NULL check
Restrict the CAP_NET_ADMIN capability to trusted users or processes only
If an update cannot be applied, remove or disable bonding interfaces from the system

Generated by OpenCVE AI on July 21, 2026 at 14:43 UTC.

Tracking

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Advisories

Source	ID	Title
Debian DLA	DLA-4664-1	linux security update
Debian DLA	DLA-4665-1	linux security update
Debian DLA	DLA-4671-1	linux-6.1 security update

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00164.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/1b7558c85493467b2ea20738866b822db6442034
https://git.kernel.org/stable/c/66693957bacd1c9dae6188a7312d6be69a221f2d
https://git.kernel.org/stable/c/a629418d463fb50d132a1aa063b0105857311e5f
https://git.kernel.org/stable/c/a764b0e8317a863006e05732e1aefe821b9d8c2d
https://git.kernel.org/stable/c/b02b2e3e876c18733b868a29064abd11cdbf8feb
https://git.kernel.org/stable/c/b0878106ddc486375084145848ff255dedfff46a
https://git.kernel.org/stable/c/bcb8fad90f27300add583a8371db504b766d95c7
https://git.kernel.org/stable/c/c2cfe290fdb1c32a4f4eb2b8ca3f363b305d21ba
https://lore.kernel.org/linux-cve-announce/2026070143-CVE-2026-53337-f2ec@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-53337
https://www.cve.org/CVERecord?id=CVE-2026-53337

History

Thu, 02 Jul 2026 00:15:00 +0000

Type	Values Removed	Values Added
References		https://lore.kernel.org/linux-cve-announce/2026070143-CVE-2026-53337-f2ec@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2026-53337 https://www.cve.org/CVERecord?id=CVE-2026-53337
Metrics	threat_severity `None`	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}` threat_severity `Low`

Wed, 01 Jul 2026 21:45:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-476

Wed, 01 Jul 2026 13:45:00 +0000

Type	Values Removed	Values Added
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.
Title		net: bonding: fix NULL pointer dereference in bond_do_ioctl()
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/1b7558c85493467b2ea20738866b822db6442034 https://git.kernel.org/stable/c/66693957bacd1c9dae6188a7312d6be69a221f2d https://git.kernel.org/stable/c/a629418d463fb50d132a1aa063b0105857311e5f https://git.kernel.org/stable/c/a764b0e8317a863006e05732e1aefe821b9d8c2d https://git.kernel.org/stable/c/b02b2e3e876c18733b868a29064abd11cdbf8feb https://git.kernel.org/stable/c/b0878106ddc486375084145848ff255dedfff46a https://git.kernel.org/stable/c/bcb8fad90f27300add583a8371db504b766d95c7 https://git.kernel.org/stable/c/c2cfe290fdb1c32a4f4eb2b8ca3f363b305d21ba

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-07-01T13:32:19.046Z

Updated: 2026-07-01T13:32:19.046Z

Reserved: 2026-06-09T07:44:35.399Z

Link: CVE-2026-53337

Vulnrichment

No data.

NVD

No data.

Redhat

Severity : Low

Publid Date: 2026-07-01T00:00:00Z

Links: CVE-2026-53337 - Bugzilla

OpenCVE Enrichment

Updated: 2026-07-21T14:45:02Z

Weaknesses

CWE-476
NULL Pointer Dereference

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Subscriptions

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