In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: dsa: mxl862xx: fix use-after-free of DSA ports in crc_err_work<\/p>\n
Upon an MDIO CRC error mxl862xx_crc_err_work_fn() walks the DSA ports
\nand closes the CPU port conduits:<\/p>\n
\tdsa_switch_for_each_cpu_port(dp, priv->ds)
\n\t\tdev_close(dp->conduit);<\/p>\n
mxl862xx_remove() unregisters the switch before cancelling this work:<\/p>\n
\tset_bit(MXL862XX_FLAG_WORK_STOPPED, &priv->flags);
\n\tcancel_delayed_work_sync(&priv->stats_work);
\n\tdsa_unregister_switch(ds);
\n\tmxl862xx_host_shutdown(priv);<\/p>\n
dsa_unregister_switch() frees the dsa_port objects. If a CRC error
\nschedules the work during teardown it can run after the ports have been
\nfreed and dereference freed memory.<\/p>\n
Guard the port walk with MXL862XX_FLAG_WORK_STOPPED, which is already set
\nbefore dsa_unregister_switch(). DSA tears the ports down under
\nrtnl_lock(), so checking the flag under rtnl_lock() means the work either
\nruns before teardown and sees valid ports, or runs afterwards, observes
\nthe flag and skips the walk. This mirrors the host_flood_work handler,
\nwhich skips torn-down ports under rtnl_lock().<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: dsa: mxl862xx: fix use-after-free of DSA ports in crc_err_work<\/p>\n
Upon an MDIO CRC error mxl862xx_crc_err_work_fn() walks the DS<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7061","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7061","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7061"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7061"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7061"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}