CVE-2026-72256

A flaw was found in the Linux kernel. The xtcluster module, specifically within the xtclustermt function, incorrectly processes template connection tracking conntrack objects. This state confusion occurs when a template conntrack is attached before it is fully initialized, leading to xtclusterhas...

CVE-2026-72423

A flaw was found in the Linux kernel. The BPF Berkeley Packet Filter subsystem's conntrack connection tracking functionality contains an out-of-bounds write vulnerability. This occurs because the system does not properly validate the size of an options structure when reporting errors in conntrack...

CVE-2026-72247

A flaw was found in the Linux kernel's netfilter nfconncount component. An incorrect comparison of conntrack zones in the connection counting logic can cause different zones to be treated as equal. This miscalculation in connection deduplication may lead to connection limits not being properly...

UBUNTU-CVE-2026-72423

In the Linux kernel, the following vulnerability has been resolved: bpf: Guard conntrack opts error writes The conntrack lookup and allocation kfuncs take an opts pointer together with an optssz argument. The verifier checks only the memory range described by optssz, but the wrappers...

UBUNTU-CVE-2026-72247

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconncount: fix zone comparison in tuple dedup The "already exists" dedup logic in nfconncountadd decides whether a connection has already been counted and can be skipped instead of incrementing the connlimit count. I...

UBUNTU-CVE-2026-72256

In the Linux kernel, the following vulnerability has been resolved: netfilter: xtcluster: reject template conntracks in hash match xtclustermt treats any non-NULL nfctget result as a fully initialized conntrack and passes it to xtclusterhash. This causes a state confusion bug when the raw table C...

EUVD-2026-59657

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix skb leak on flow key update failure during ct ovsctexecute always steals or frees the skb on failure while ovsflowkeyupdate does not. So, if it fails and we return right away, the skb ends up leaked. Fix tha...

CVE-2026-74464 net: openvswitch: fix skb leak on flow key update failure during ct

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix skb leak on flow key update failure during ct ovsctexecute always steals or frees the skb on failure while ovsflowkeyupdate does not. So, if it fails and we return right away, the skb ends up leaked. Fix tha...

CVE-2026-74347

In the Linux kernel, the following vulnerability has been resolved: netfilter: cttimeout: detach dataplane timeout policy and repurpose refcount Add a refcount for struct nfcttimeout which is used by ct extension to set the custom ct timeout policy, this tells us that the ct timeout is being used...

CVE-2026-72423

In the Linux kernel, the following vulnerability has been resolved: bpf: Guard conntrack opts error writes The conntrack lookup and allocation kfuncs take an opts pointer together with an optssz argument. The verifier checks only the memory range described by optssz, but the wrappers...

CVE-2026-72256

In the Linux kernel, the following vulnerability has been resolved: netfilter: xtcluster: reject template conntracks in hash match xtclustermt treats any non-NULL nfctget result as a fully initialized conntrack and passes it to xtclusterhash. This causes a state confusion bug when the raw table C...

CVE-2026-72247

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconncount: fix zone comparison in tuple dedup The "already exists" dedup logic in nfconncountadd decides whether a connection has already been counted and can be skipped instead of incrementing the connlimit count. I...

CVE-2026-74347 netfilter: cttimeout: detach dataplane timeout policy and repurpose refcount

In the Linux kernel, the following vulnerability has been resolved: netfilter: cttimeout: detach dataplane timeout policy and repurpose refcount Add a refcount for struct nfcttimeout which is used by ct extension to set the custom ct timeout policy, this tells us that the ct timeout is being used...

CVE-2026-74347

This CVE concerns the Linux kernel netfilter cttimeout handling. The fix adds a refcount for struct nf_ct_timeout used by the ct extension to track whether a conntrack entry uses the custom timeout policy, and then removes the control-plane refcount so the timeout policy can be removed immediatel...

CVE-2026-74347 netfilter: cttimeout: detach dataplane timeout policy and repurpose refcount

In the Linux kernel, the following vulnerability has been resolved: netfilter: cttimeout: detach dataplane timeout policy and repurpose refcount Add a refcount for struct nfcttimeout which is used by ct extension to set the custom ct timeout policy, this tells us that the ct timeout is being used...

EUVD-2026-59494

In the Linux kernel, the following vulnerability has been resolved: netfilter: cttimeout: detach dataplane timeout policy and repurpose refcount Add a refcount for struct nfcttimeout which is used by ct extension to set the custom ct timeout policy, this tells us that the ct timeout is being used...

CVE-2026-72423 bpf: Guard conntrack opts error writes

In the Linux kernel, the following vulnerability has been resolved: bpf: Guard conntrack opts error writes The conntrack lookup and allocation kfuncs take an opts pointer together with an optssz argument. The verifier checks only the memory range described by optssz, but the wrappers...

CVE-2026-72423

The CVE-2026-72423 vulnerability affects the Linux kernel’s BPF conntrack error reporting: wrappers for conntrack kfuncs may write to opts->error outside the verifier-checked range, for certain sizes. The issue occurs when using an opts pointer with an accompanying opts__sz argument; the verif...

EUVD-2026-59322

In the Linux kernel, the following vulnerability has been resolved: bpf: Guard conntrack opts error writes The conntrack lookup and allocation kfuncs take an opts pointer together with an optssz argument. The verifier checks only the memory range described by optssz, but the wrappers...

CVE-2026-72423 bpf: Guard conntrack opts error writes

In the Linux kernel, the following vulnerability has been resolved: bpf: Guard conntrack opts error writes The conntrack lookup and allocation kfuncs take an opts pointer together with an optssz argument. The verifier checks only the memory range described by optssz, but the wrappers...