CVE-2026-97476— rds: filter RDS_INFO_* getsockopt by caller's netns
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 Linux 内核中，已解决以下漏洞： RDS：按调用者的网络命名空间（netns）过滤 RDS_INFO_ getsockopt 选项 系列的 选项会读取若干文件作用域的全局列表，这些列表并非按网络命名空间（per-netns）隔离： / / → / → / （用于 和 变体） （用于 ）→ 这些处理函数未根据调用者的网络命名空间进行过滤。 没有执行 netns 检查或 权限检查， 也没有 检查，因此非特权用户命名空间可以访问 套接字。结果是，处于全新用户命名空间（user_ns）和网络命名空间（netns）中
Affected Version Matrix 16
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4< 64ca5839916176c3451f61a2c7178033423c67d7 |
affected |
639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4< 8b04dda272c30d46834bb03dd2895b08c090483b |
affected | ||
639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4< f05142d0eeaa6e8227511c88e10a2b8fe7a78fc4 |
affected | ||
639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4< 65fae4b42269dbea7e3842ae4dd0786162c6248e |
affected | ||
639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4< 093f172296d32499ffac7809629b206178776eb6 |
affected | ||
639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4< c4081e49ebe0e3160c4b70ec7639494792dee206 |
affected | ||
639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4< c96a5209dda666004b8ee1ed7f0d493d09a4f200 |
affected | ||
2.6.30 |
affected | ||
| … +8 more rows | |||
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I. Basic Information for CVE-2026-97476
Vulnerability Information
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Vulnerability Title
rds: filter RDS_INFO_* getsockopt by caller's netns
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-97476
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|---|
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Patches & Fixes for CVE-2026-97476 (7)
Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total
| CVE-2026-93207 | 9.8 CRITICAL | SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry |
| CVE-2026-97413 | 9.8 CRITICAL | RDMA/rtrs-srv: Fix integer underflow in process_read and process_write |
| CVE-2026-93228 | 9.1 CRITICAL | svcrdma: Reject Write/Reply chunks with segcount 0 |
| CVE-2026-93799 | 8.8 HIGH | wifi: iwlwifi: mvm: validate sta_id in BA window status notif |
| CVE-2026-97442 | 8.8 HIGH | wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi |
| CVE-2026-97409 | 8.8 HIGH | nvme-fc: Do not cancel requests in io target before it is initialized |
| CVE-2026-93806 | 8.8 HIGH | wifi: cfg80211: validate assoc response length before status and IE access |
| CVE-2026-93793 | 8.8 HIGH | wifi: iwlwifi: mvm: validate TX_CMD response layout |
| CVE-2026-93790 | 8.8 HIGH | wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif |
| CVE-2026-93284 | 8.8 HIGH | drm/pagemap: dma-unmap pages before handling migration errors |
| CVE-2026-93280 | 8.8 HIGH | greybus: audio: bound the topology section sizes against the fetched size |
| CVE-2026-97509 | 8.8 HIGH | thunderbolt: Keep XDomain reference during the lifetime of a service |
| CVE-2026-93827 | 8.4 HIGH | virtio-fs: avoid double-free on failed queue setup |
| CVE-2026-97450 | 8.4 HIGH | ACPICA: validate handler object type in two places |
| CVE-2026-97451 | 8.4 HIGH | ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op) |
| CVE-2026-97452 | 8.4 HIGH | ACPICA: Prevent adding invalid references |
| CVE-2026-97455 | 8.4 HIGH | ACPICA: Fix use-after-free in acpi_ds_terminate_control_method() |
| CVE-2026-97433 | 8.2 HIGH | nvme: validate FDP configuration descriptor sizes |
| CVE-2026-93221 | 8.1 HIGH | nfsd: convert nfsd_net boolean flags to unsigned long flags word |
| CVE-2026-93786 | 8.1 HIGH | ksmbd: preserve VFS inherited POSIX ACL mask |
Showing top 20 of 234 CVEs. View all on vendor page → →
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