CVE-2026-31680

The CVE concerns a race in the Linux kernel IPv6 flow label handling. In ip6fl_seq_show(), the global flowlabel hash is read under an RCU read lock, and an option block’s state fl->opt->opt_nflen may be printed when present. The current lifetime of the option state can end with fl->users...

CVE-2026-31680

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: flowlabel: defer exclusive option free until RCU teardown ip6flseqshow walks the global flowlabel hash under the seq-file RCU read-side lock and prints fl-opt-optnflen when an option block is present. Exclusive...

EUVD-2026-25641

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6trt: reject oversized addrnr in rtmt6check Reject rt match rules whose addrnr exceeds IP6TRTHOPS. rtmt6 expects addrnr to stay within the bounds of rtinfo-addrs. Validate addrnr during rule installation so malformed...

CVE-2026-31674 netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6trt: reject oversized addrnr in rtmt6check Reject rt match rules whose addrnr exceeds IP6TRTHOPS. rtmt6 expects addrnr to stay within the bounds of rtinfo-addrs. Validate addrnr during rule installation so malformed...

CVE-2026-31674 netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6trt: reject oversized addrnr in rtmt6check Reject rt match rules whose addrnr exceeds IP6TRTHOPS. rtmt6 expects addrnr to stay within the bounds of rtinfo-addrs. Validate addrnr during rule installation so malformed...

CVE-2026-31674

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6trt: reject oversized addrnr in rtmt6check Reject rt match rules whose addrnr exceeds IP6TRTHOPS. rtmt6 expects addrnr to stay within the bounds of rtinfo-addrs. Validate addrnr during rule installation so malformed...

SUSE CVE-2026-31669

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix slab-use-after-free in inetlookupestablished The ehash table lookups are lockless and rely on SLABTYPESAFEBYRCU to guarantee socket memory stability during RCU read-side critical sections. Both tcpprot and tcpv6prot ha...

Fedora 44 : perl-Net-CIDR-Lite (2026-fe487aa625)

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-fe487aa625 advisory. This update addresses two security issues regarding incorrect handling of malformed IPv6 addresses: Fix IPv4 mapped IPv6 packed length CVE-2026-4019...

CVE-2026-31680: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: flowlabel: defer exclusive option free until RCU teardown ip6flseqshow walks the global flowlabel hash under the seq-file RCU read-side lock and prints fl-opt-optnflen when an option block is present. Exclusive...

CVE-2026-31630

A flaw was found in the Linux kernel, specifically within the rxrpc component. The AFRXRPC procfs helpers use fixed-size buffers to format local and remote socket addresses. When processing certain IPv6 addresses with ports, the formatted string can exceed the buffer's capacity, leading to a buff...

DEBIAN-CVE-2026-31669

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix slab-use-after-free in inetlookupestablished The ehash table lookups are lockless and rely on SLABTYPESAFEBYRCU to guarantee socket memory stability during RCU read-side critical sections. Both tcpprot and tcpv6prot ha...

AZL-83837 CVE-2026-31669 affecting package kernel for versions less than 6.6.137.1-1

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix slab-use-after-free in inetlookupestablished The ehash table lookups are lockless and rely on SLABTYPESAFEBYRCU to guarantee socket memory stability during RCU read-side critical sections. Both tcpprot and tcpv6prot ha...

DEBIAN-CVE-2026-31630

In the Linux kernel, the following vulnerability has been resolved: rxrpc: proc: size address buffers for %pISpc output The AFRXRPC procfs helpers format local and remote socket addresses into fixed 50-byte stack buffers with "%pISpc". That is too small for the longest current-tree IPv6-with-port...

AZL-83825 CVE-2026-31630 affecting package kernel 6.6.157.1-1

In the Linux kernel, the following vulnerability has been resolved: rxrpc: proc: size address buffers for %pISpc output The AFRXRPC procfs helpers format local and remote socket addresses into fixed 50-byte stack buffers with "%pISpc". That is too small for the longest current-tree IPv6-with-port...

CVE-2026-31630

In the Linux kernel, the following vulnerability has been resolved: rxrpc: proc: size address buffers for %pISpc output The AFRXRPC procfs helpers format local and remote socket addresses into fixed 50-byte stack buffers with "%pISpc". That is too small for the longest current-tree IPv6-with-port...

CVE-2026-31669

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix slab-use-after-free in inetlookupestablished The ehash table lookups are lockless and rely on SLABTYPESAFEBYRCU to guarantee socket memory stability during RCU read-side critical sections. Both tcpprot and tcpv6prot ha...

CVE-2026-31669 mptcp: fix slab-use-after-free in __inet_lookup_established

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix slab-use-after-free in inetlookupestablished The ehash table lookups are lockless and rely on SLABTYPESAFEBYRCU to guarantee socket memory stability during RCU read-side critical sections. Both tcpprot and tcpv6prot ha...

EUVD-2026-25562

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix slab-use-after-free in inetlookupestablished The ehash table lookups are lockless and rely on SLABTYPESAFEBYRCU to guarantee socket memory stability during RCU read-side critical sections. Both tcpprot and tcpv6prot ha...

CVE-2026-31669

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix slab-use-after-free in inetlookupestablished The ehash table lookups are lockless and rely on SLABTYPESAFEBYRCU to guarantee socket memory stability during RCU read-side critical sections. Both tcpprot and tcpv6prot ha...

CVE-2026-31669

The CVE-2026-31669 entry pertains to the Linux kernel MPTCP code. A use-after-free could occur in IPv6 subflow sockets due to premature copying of tcpv6_prot into tcpv6_prot_override during early init, before proto_register(&tcpv6_prot) and its SLAB_TYPESAFE_BY_RCU cache is established. Consequen...