CVE-2026-68335High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: rds: drop incoming messages that cross network namespace boundaries rds_find_bound() looks up the destination socket using a global rhashtable keyed solely on (addr, p…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.1%
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
rds: drop incoming messages that cross network namespace boundaries
rds_find_bound() looks up the destination socket using a global rhashtable keyed solely on (addr, port, scope_id). Network namespaces are not part of the key, so a sender in netns A can deliver an incoming message (inc) to a socket that lives in a different netns B.
When this happens, inc->i_conn points to an rds_connection whose c_net is netns A, but the receiving rs lives in netns B. Once the child process that created netns A exits, cleanup_net() calls rds_loop_exit_net() -> rds_loop_kill_conns() -> rds_conn_destroy(), freeing that connection. If the survivor socket in netns B still holds the inc, any subsequent dereference of inc->i_conn is a use-after-free.
There are two dangerous sites in rds_clear_recv_queue():
The bug is reachable from unprivileged user namespaces (CLONE_NEWUSER + CLONE_NEWNET), available since Linux 3.8.
Fix this by rejecting the delivery in rds_recv_incoming() when the socket returned by rds_find_bound() belongs to a different network namespace than the connection that carried the message. Use the existing rds_conn_net() / sock_net() helpers and net_eq() for the comparison.
Linux >= c809195f5523dd4d09403bbb1c9732d548aa0d1e < 742ff6f02545212e991cd8b45011e40d2c2ef25aLinux >= c809195f5523dd4d09403bbb1c9732d548aa0d1e < abff41fd928328bbf3dda1140beb2e61fa424ccdLinux >= c809195f5523dd4d09403bbb1c9732d548aa0d1e < 03c574112e5d066df0ddce36d7438e850bcf3050Linux >= c809195f5523dd4d09403bbb1c9732d548aa0d1e < 1e2e2d9806944fe485824d617c8b7c78116c22dbLinux >= c809195f5523dd4d09403bbb1c9732d548aa0d1e < cfb3ce07b705e486e022a2f2b1242b48f13981ffLinux >= c809195f5523dd4d09403bbb1c9732d548aa0d1e < 9591042533140dfe6608d9344806d567dcd39d02Linux >= c809195f5523dd4d09403bbb1c9732d548aa0d1e < 0f8690e3869109cd5803ccb400889d20a0b54e0eLinux >= c809195f5523dd4d09403bbb1c9732d548aa0d1e < 5521ae71e32a8069ed4ca6e792179dc57bc43ab2Linux c827073c95fde388bc65fe5227f944eaf859b9f0Linux >= 4.17.19 < 4.18Linux 4.18Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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