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CVE-2026-68335— rds: drop incoming messages that cross network namespace boundaries

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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 4.18版本存在安全漏洞，该漏洞源于rds_find_bound()查找目标套接字时未将网络命名空间作为键的一部分，导致跨命名空间消息传递，释放连接后仍被引用，造成释放后重用。

CVSS 7.8 · High EPSS 0.14% · P3

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux c809195f5523dd4d09403bbb1c9732d548aa0d1e< 742ff6f02545212e991cd8b45011e40d2c2ef25a affected
c809195f5523dd4d09403bbb1c9732d548aa0d1e< abff41fd928328bbf3dda1140beb2e61fa424ccd affected
c809195f5523dd4d09403bbb1c9732d548aa0d1e< 03c574112e5d066df0ddce36d7438e850bcf3050 affected
c809195f5523dd4d09403bbb1c9732d548aa0d1e< 1e2e2d9806944fe485824d617c8b7c78116c22db affected
c809195f5523dd4d09403bbb1c9732d548aa0d1e< cfb3ce07b705e486e022a2f2b1242b48f13981ff affected
c809195f5523dd4d09403bbb1c9732d548aa0d1e< 9591042533140dfe6608d9344806d567dcd39d02 affected
c809195f5523dd4d09403bbb1c9732d548aa0d1e< 0f8690e3869109cd5803ccb400889d20a0b54e0e affected
c809195f5523dd4d09403bbb1c9732d548aa0d1e< 5521ae71e32a8069ed4ca6e792179dc57bc43ab2 affected
… +12 more rows
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I. Basic Information for CVE-2026-68335

Vulnerability Information
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Vulnerability Title
rds: drop incoming messages that cross network namespace boundaries
Source: CVE Program / CVE List V5
Vulnerability Description
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(): 1. inc->i_conn->c_lcong (offset 88 of freed rds_connection, size 200) read via rds_recv_rcvbuf_delta() -- confirmed by KASAN. 2. inc->i_conn->c_trans->inc_free(inc) (function pointer at offset 80) called via rds_inc_put() when the inc refcount reaches zero -- same race window, potential call-through-freed-object primitive. 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 4.18版本存在安全漏洞，该漏洞源于rds_find_bound()查找目标套接字时未将网络命名空间作为键的一部分，导致跨命名空间消息传递，释放连接后仍被引用，造成释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux c809195f5523dd4d09403bbb1c9732d548aa0d1e ~ 742ff6f02545212e991cd8b45011e40d2c2ef25a -
Linux Linux 4.18 -

II. Public POCs for CVE-2026-68335

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III. Intelligence Information for CVE-2026-68335

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Patches & Fixes for CVE-2026-68335 (7)

Same Patch Batch · Linux · 2026-08-10 · 344 CVEs total

CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow

Showing top 20 of 344 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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