CVE-2026-97476rds: filter RDS_INFO_* getsockopt by caller's netns
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: rds: filter RDS_INFO_* getsockopt by caller's netns The RDS_INFO_* family of getsockopt(2) options reads several file-scope global lists that are not per-netns: rds_sock_info / rds6_sock_info, rds_sock_inc_info / rds6_sock_inc_info -> rds_sock_list rds_tcp_tc_info / rds6_tcp_tc_info -> rds_tcp_tc_list rds_conn_info / rds6_conn_info, rds_conn_message_info_cmn (for the *_SEND_MESSAGES and *_RETRANS_MESSAGES variants), rds_for_each_conn_info (for RDS_INFO_IB_CONNECTIONS) -> rds_conn_hash[] The handlers do not filter by the caller's network namespace. rds_info_getsockopt() has no netns or capable() check, and rds_create() has no capable() check, so AF_RDS is reachable from an unprivileged user namespace. As a result, an unprivileged caller in a fresh user_ns plus netns can read the bound address and sock inode of every RDS socket on the host, the peer address of incoming messages on every RDS socket on the host, the peer address and TCP sequence numbers of every rds-tcp connection on the host, and the peer address and RDS sequence numbers of every RDS connection on the host. The rds-tcp transport is reachable from a non-initial netns (see rds_set_transport()), so a one-shot init_net gate at rds_info_getsockopt() would deny legitimate per-netns visibility to rds-tcp callers. Instead, filter at each handler by comparing the netns of the caller's socket to the netns of the list entry, or to rds_conn_net(conn) for connection paths. Only copy entries whose netns matches the caller. Counters (RDS_INFO_COUNTERS) are aggregate statistics and remain global. Reproducer (KASAN VM, rds and rds_tcp loaded): an AF_RDS socket binds 127.0.0.1:4242 in init_net as root. A child process enters a fresh user_ns plus netns and opens AF_RDS there, then calls getsockopt(SOL_RDS, RDS_INFO_SOCKETS). Before this change, the child sees the init_net socket. After this change, the child sees zero entries. Drop the rds_sock_count, rds_tcp_tc_count, and rds6_tcp_tc_count globals. v2 used them for the size precheck and lens->nr; v3 replaced the precheck with a per-ns count from a first pass over the list, so the globals have no remaining readers. The matching increments and decrements in rds_create()/rds_destroy_sock() and rds_tcp_set_callbacks()/rds_tcp_restore_callbacks() go away with them. Reported by the kernel test robot under clang W=1.
Timeline
ID reserved
By Linux
Published
- 9 days later
· 9 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4 – < 64ca5839916176c3451f61a2c7178033423c67d7
- affected 639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4 – < 8b04dda272c30d46834bb03dd2895b08c090483b
- affected 639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4 – < f05142d0eeaa6e8227511c88e10a2b8fe7a78fc4
- affected 639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4 – < 65fae4b42269dbea7e3842ae4dd0786162c6248e
- affected 639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4 – < 093f172296d32499ffac7809629b206178776eb6
- affected 639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4 – < c4081e49ebe0e3160c4b70ec7639494792dee206
- affected 639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4 – < c96a5209dda666004b8ee1ed7f0d493d09a4f200
- affected 2.6.30
- unaffected < 2.6.30
- unaffected 5.10.271 – ≤ 5.10.*
- unaffected 5.15.222 – ≤ 5.15.*
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.53 – ≤ 6.18.*
- unaffected 7.2 – ≤ *
References
References7
- https://git.kernel.org/stable/c/64ca5839916176c3451f61a2c7178033423c67d7 (opens in a new tab)
- https://git.kernel.org/stable/c/8b04dda272c30d46834bb03dd2895b08c090483b (opens in a new tab)
- https://git.kernel.org/stable/c/f05142d0eeaa6e8227511c88e10a2b8fe7a78fc4 (opens in a new tab)
- https://git.kernel.org/stable/c/65fae4b42269dbea7e3842ae4dd0786162c6248e (opens in a new tab)
- https://git.kernel.org/stable/c/093f172296d32499ffac7809629b206178776eb6 (opens in a new tab)
- https://git.kernel.org/stable/c/c4081e49ebe0e3160c4b70ec7639494792dee206 (opens in a new tab)
- https://git.kernel.org/stable/c/c96a5209dda666004b8ee1ed7f0d493d09a4f200 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-86074 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-97476)Record last updated .