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

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

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...

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.

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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...