Medium 5.5Published May 6, 2026

CVE-2026-43173net: ethernet: xscale: Check for PTP support properly

Updated under an hour ago (Oct 27, 2026, 12:23 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: net: ethernet: xscale: Check for PTP support properly In ixp4xx_get_ts_info() ixp46x_ptp_find() is called unconditionally despite this feature only existing on ixp46x, leading to the following splat from tcpdump: root@OpenWrt:~# tcpdump -vv -X -i eth0 (...) Unable to handle kernel NULL pointer dereference at virtual address 00000238 when read (...) Call trace: ptp_clock_index from ixp46x_ptp_find+0x1c/0x38 ixp46x_ptp_find from ixp4xx_get_ts_info+0x4c/0x64 ixp4xx_get_ts_info from __ethtool_get_ts_info+0x90/0x108 __ethtool_get_ts_info from __dev_ethtool+0xa00/0x2648 __dev_ethtool from dev_ethtool+0x160/0x234 dev_ethtool from dev_ioctl+0x2cc/0x460 dev_ioctl from sock_ioctl+0x1ec/0x524 sock_ioctl from sys_ioctl+0x51c/0xa94 sys_ioctl from ret_fast_syscall+0x0/0x44 (...) Segmentation fault Check for ixp46x in ixp46x_ptp_find() before trying to set up PTP to avoid this. To avoid altering the returned error code from ixp4xx_hwtstamp_set() which before this patch was -EOPNOTSUPP, we return -EOPNOTSUPP from ixp4xx_hwtstamp_set() if ixp46x_ptp_find() fails no matter the error code. The helper function ixp46x_ptp_find() helper returns -ENODEV.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Jun 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 9055a2f591629b952910503e72ddae1371c44bf1 before 322437972f0a712767f6920ad34aba25f2e9b942; 9055a2f591629b952910503e72ddae1371c44bf1 builds before 21d1e80d0d6e7d0c3cd8b1e001ed1fa92fb9f3f5; 9055a2f591629b952910503e72ddae1371c44bf1 builds before 2d74412dfd3621552a394d55cc3dd26a7cbf608e; from 9055a2f591629b952910503e72ddae1371c44bf1 before cbecebd35909f6cd0f6fb773f0fb73da99e02f8c; from 9055a2f591629b952910503e72ddae1371c44bf1 before 594163ea88a03bdb412063af50fc7177ef3cbeae	CNA record
linux linux_kernel linux:linux_kernel	from 5.15 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6; 7.0	NVD

References

References

https://git.kernel.org/stable/c/322437972f0a712767f6920ad34aba25f2e9b942	patch
https://git.kernel.org/stable/c/21d1e80d0d6e7d0c3cd8b1e001ed1fa92fb9f3f5	patch
https://git.kernel.org/stable/c/2d74412dfd3621552a394d55cc3dd26a7cbf608e	patch
https://git.kernel.org/stable/c/cbecebd35909f6cd0f6fb773f0fb73da99e02f8c	patch
https://git.kernel.org/stable/c/594163ea88a03bdb412063af50fc7177ef3cbeae	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.