CVE-2026-98101: Linux

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: use copy-on-write RCU updates in ip6_mc_source() pmc->sflist is read locklessly under rcu_read_lock() by inet6_mc_check() during packet reception in the UDP and RAW multicast receive paths. ip6_mc_source() mutated psl->sl_addr and psl->sl_count in-place when adding or removing a source filter. Additionally, when expanding the filter buffer, newpsl was published via rcu_assign_pointer() before writing the new source into the array. Because 16-byte struct in6_addr writes are not atomic and array shifting is not synchronized with RCU readers, concurrent readers in inet6_mc_check() could read torn IPv6 addresses or observe duplicated/missed source entries. Fix this by switching ip6_mc_source() to copy-on-write RCU updates: allocate and fully populate newpsl before publishing it via rcu_assign_pointer(), and reclaim the old filter via kfree_rcu(), matching ip6_mc_msfilter(). Also remove the now unused IP6_SFBLOCK macro.

Засегнати продукти

• Linux Linux: 882ba1f73c06831f2a21044ebd8864c485ac04f2 преди ac51321d3b2391860a935820ebcf4d8b9bb16a8a; 882ba1f73c06831f2a21044ebd8864c485ac04f2 преди dba00514bf668c26cb4900e9f0da84bf96bf065a; 882ba1f73c06831f2a21044ebd8864c485ac04f2 преди 2c2091e2ee93049fc513ad1e6c99d8b6c809f467; 882ba1f73c06831f2a21044ebd8864c485ac04f2 преди 20db91a052332ef5552bd2f651ffb9db911cf67b; 882ba1f73c06831f2a21044ebd8864c485ac04f2 преди c073d1b070f171d206b19c98d71739a97f15b3f1; 47c75e3923c8d562fea8daf0ccf31546a7bef0ea; 5.10.261 преди 5.11
• Linux Linux: 5.13; преди 5.13; 6.6.158 до 6.6.*; 6.12.112 до 6.12.*; 6.18.53 до 6.18.*; 7.2.7 до 7.2.*; от 7.3 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-98101
• https://nvd.nist.gov/vuln/detail/CVE-2026-98101
• https://git.kernel.org/stable/c/ac51321d3b2391860a935820ebcf4d8b9bb16a8a
• https://git.kernel.org/stable/c/dba00514bf668c26cb4900e9f0da84bf96bf065a
• https://git.kernel.org/stable/c/2c2091e2ee93049fc513ad1e6c99d8b6c809f467
• https://git.kernel.org/stable/c/20db91a052332ef5552bd2f651ffb9db911cf67b
• https://git.kernel.org/stable/c/c073d1b070f171d206b19c98d71739a97f15b3f1