CVE-2026-43173
MediumCVSS 5.5Summary
W jądrze systemu Linux zidentyfikowano podatność, która dotyczy nieprawidłowego sprawdzania wsparcia dla PTP w funkcji ixp4xx_get_ts_info(). Wywołanie ixp46x_ptp_find() odbywa się bezwarunkowo, co prowadzi do błędu dereferencji wskaźnika NULL i awarii systemu.
Risk Assessment
Podatność ta może prowadzić do awarii systemu, co może wpłynąć na dostępność usług sieciowych w organizacji. W przypadku wykorzystania tej luki, atakujący może spowodować nieprzewidziane zachowanie systemu.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, w której ta podatność została naprawiona. Dodatkowo, należy upewnić się, że funkcja ixp46x_ptp_find() jest wywoływana tylko w odpowiednich warunkach.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

