In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()<\/p>\n
When removing a source filter whose count reaches zero, ip6_mc_del1_src()
\nunlinks psf from pmc->mca_sources. If the filter was previously active,
\nthe code moved psf directly into pmc->mca_tomb by updating psf->sf_next.<\/p>\n
Because pmc->mca_sources is traversed locklessly under RCU (e.g. by
\nipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period
\nelapses diverts concurrent readers to the tombstone list. Consequently,
\nreaders miss remaining active sources in pmc->mca_sources and improperly
\nexamine deleted tombstone entries.<\/p>\n
Fix this by allocating a new tombstone node for pmc->mca_tomb (as done
\nin sf_setstate()) and retiring the original psf via kfree_rcu().<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()<\/p>\n
When removing a source filter whose count reaches zero, ip6_mc_del1_src()<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29256","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29256","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=29256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}