CVE-2023-54156

Summary

In the Linux kernel, the following vulnerability has been resolved:

sfc: fix crash when reading stats while NIC is resetting

efx_net_stats() (.ndo_get_stats64) can be called during an ethtool selftest, during which time nic_data->mc_stats is NULL as the NIC has been fini'd. In this case do not attempt to fetch the latest stats from the hardware, else we will crash on a NULL dereference: BUG: kernel NULL pointer dereference, address: 0000000000000038 RIP efx_nic_update_stats abridged calltrace: efx_ef10_update_stats_pf efx_net_stats dev_get_stats dev_seq_printf_stats Skipping the read is safe, we will simply give out stale stats. To ensure that the free in efx_ef10_fini_nic() does not race against efx_ef10_update_stats_pf(), which could cause a TOCTTOU bug, take the efx->stats_lock in fini_nic (it is already held across update_stats).

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd3142c193dca9a2f6878f4128ce1aaf221bb3f99 < cb1aa7cc562cab6a87ea33574c8c65f2d2fd7aebaffected
LinuxLinuxd3142c193dca9a2f6878f4128ce1aaf221bb3f99 < 91f4ef204e731565afdc6c2a7fcf509a3fd6fd67affected
LinuxLinuxd3142c193dca9a2f6878f4128ce1aaf221bb3f99 < 446f5567934331923d0aec4ce045e4ecb0174aaeaffected
LinuxLinuxd3142c193dca9a2f6878f4128ce1aaf221bb3f99 < 470152d76b3ed107d172ea46acc4bfa941f20b4baffected
LinuxLinuxd3142c193dca9a2f6878f4128ce1aaf221bb3f99 < aba32b4c58112960c0c708703ca6b44dc8944082affected
LinuxLinuxd3142c193dca9a2f6878f4128ce1aaf221bb3f99 < d1b355438b8325a486f087e506d412c4e852f37baffected
LinuxLinux5.9affected
LinuxLinux0 < 5.9unaffected
LinuxLinux5.10.188 <= 5.10.*unaffected
LinuxLinux5.15.121 <= 5.15.*unaffected
LinuxLinux6.1.39 <= 6.1.*unaffected
LinuxLinux6.3.13 <= 6.3.*unaffected
LinuxLinux6.4.4 <= 6.4.*unaffected
LinuxLinux6.5 <= *unaffected

Weaknesses

References