UBUNTU-CVE-2026-68335

In the Linux kernel, the following vulnerability has been resolved: rds: drop incoming messages that cross network namespace boundaries rdsfindbound looks up the destination socket using a global rhashtable keyed solely on addr, port, scopeid. Network namespaces are not part of the key, so a send...

CVE-2026-63917

In the Linux kernel, the following vulnerability has been resolved: ip6: vti: Use ip6tnl.net in vti6changelink. ip netns add ns1 ip netns add ns2 ip -n ns1 link add vti6test type vti6 remote ::1 local ::2 key 7 ip -n ns1 link set vti6test netns ns2 ip -n ns2 link set vti6test type vti6 remote ::3...

PT-2026-61234

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the vti6 changelink function where the kernel fails to correctly handle network namespace changes for vti6 devices. When a vti6 tunnel is moved to a different network...

CVE-2026-53075 ppp: require CAP_NET_ADMIN in target netns for unattached ioctls

In the Linux kernel, the following vulnerability has been resolved: ppp: require CAPNETADMIN in target netns for unattached ioctls /dev/ppp open is currently authorized against file-fcred-userns, while unattached administrative ioctls operate on current-nsproxy-netns. As a result, a local...

CVE-2026-46120

In the Linux kernel, the following vulnerability has been resolved: ip6gre: Use cached t-net in ip6erspanchangelink. After commit 5e72ce3e3980 "net: ipv6: Use link netns in newlink of rtnllinkops", ip6erspannewlink correctly resolves the per-netns ip6gre hash via linknet. ip6erspanchangelink was...

Qualys TRU Discovers Three Bypasses of Ubuntu Unprivileged User Namespace Restrictions

The Qualys Threat Research Unit TRU recently disclosed three security bypasses in Ubuntu's unprivileged user namespace restrictions. Qualys responsibly disclosed these vulnerabilities to the Ubuntu Security Team on January 15, 2025, and has been working with Ubuntu since then. Qualys TRU uncovere...

An issue was discovered in the Linux kernel through 5.18.9. A type confusion bug in nft_set_elem_init (leading to a buffer overflow) could be used by a local attacker to escalate privileges a different vulnerability than CVE-2022-32250. (The attacker can obtain root access but must start with an unprivileged user namespace to obtain CAP_NET_ADMIN access.) This can be fixed in nft_setelem_parse_data in net/netfilter/nf_tables_api.c.

...

Type confusion

An issue was discovered in the Linux kernel through 5.18.9. A type confusion bug in nftseteleminit leading to a buffer overflow could be used by a local attacker to escalate privileges, a different vulnerability than CVE-2022-32250. The attacker can obtain root access, but must start with an...