CVE-2025-21921
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-21921
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21921.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-21921
- Downstream
- Published
- 2025-04-01T15:40:55.110Z
- Modified
- 2025-11-20T08:14:14.259108Z
- Summary
- net: ethtool: netlink: Allow NULL nlattrs when getting a phy_device
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
net: ethtool: netlink: Allow NULL nlattrs when getting a phy_device
ethnlreqgetphydev() is used to lookup a phydevice, in the case an ethtool netlink command targets a specific phydev within a netdev's topology.
It takes as a parameter a const struct nlattr *header that's used for error handling :
if (!phydev) { NL_SET_ERR_MSG_ATTR(extack, header, "no phy matching phyindex"); return ERR_PTR(-ENODEV); }In the notify path after a ->set operation however, there's no request attributes available.
The typical callsite for the above function looks like:
phydev = ethnl_req_get_phydev(req_base, tb[ETHTOOL_A_XXX_HEADER], info->extack);So, when tb is NULL (such as in the ethnl notify path), we have a nice crash.
It turns out that there's only the PLCA command that is in that case, as the other phydev-specific commands don't have a notification.
This commit fixes the crash by passing the cmd index and the nlattr array separately, allowing NULL-checking it directly inside the helper.
- References
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedc15e065b46dc4e19837275b826c1960d55564abdFixed639c70352958735addbba5ae7dd65985da96e061
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedc15e065b46dc4e19837275b826c1960d55564abdFixed1f458fa42c29144cef280e05bc49fc21b873d897
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedc15e065b46dc4e19837275b826c1960d55564abdFixed637399bf7e77797811adf340090b561a8f9d1213
Affected versions
v6.*
v6.11
v6.11-rc5
v6.11-rc6
v6.11-rc7
v6.12
v6.12-rc1
v6.12-rc2
v6.12-rc3
v6.12-rc4
v6.12-rc5
v6.12-rc6
v6.12-rc7
v6.12.1
v6.12.10
v6.12.11
v6.12.12
v6.12.13
v6.12.14
v6.12.15
v6.12.16
v6.12.17
v6.12.18
v6.12.2
v6.12.3
v6.12.4
v6.12.5
v6.12.6
v6.12.7
v6.12.8
v6.12.9
v6.13
v6.13-rc1
v6.13-rc2
v6.13-rc3
v6.13-rc4
v6.13-rc5
v6.13-rc6
v6.13-rc7
v6.13.1
v6.13.2
v6.13.3
v6.13.4
v6.13.5
v6.13.6
v6.14-rc1
v6.14-rc2
v6.14-rc3
v6.14-rc4
Database specific
vanir_signatures
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"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@1f458fa42c29144cef280e05bc49fc21b873d897",
"signature_version": "v1"
}
]