CVE-2026-68335 (GCVE-0-2026-68335)
Vulnerability from cvelistv5
Published
2026-08-10 12:03
Modified
2026-10-19 21:09
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: c809195f5523dd4d09403bbb1c9732d548aa0d1e
Version: c809195f5523dd4d09403bbb1c9732d548aa0d1e
Version: c809195f5523dd4d09403bbb1c9732d548aa0d1e
Version: c809195f5523dd4d09403bbb1c9732d548aa0d1e
Version: c809195f5523dd4d09403bbb1c9732d548aa0d1e
Version: c809195f5523dd4d09403bbb1c9732d548aa0d1e
Version: c809195f5523dd4d09403bbb1c9732d548aa0d1e
Version: c809195f5523dd4d09403bbb1c9732d548aa0d1e
Version: c827073c95fde388bc65fe5227f944eaf859b9f0
Version: 4.17.19   ≤
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    "dateUpdated": "2026-10-19T21:09:05.269Z",
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No race must be won and no uncontrollable precondition exists; the UAF is confirmed reproducible under KASAN.\\nPR:L - Only an unprivileged local user account is required; the needed CAP_NET_ADMIN for creating and configuring the second network namespace is obtained inside a user namespace the attacker owns, as the commit explicitly notes (\\\"reachable from unprivileged user namespaces\\\").\\nUI:N - The attacker performs every step \\u2014 socket creation, cross-netns send, namespace teardown, and the subsequent read/close that dereferences the freed connection \\u2014 with no action from any other user or administrator.\\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority; there is no crossing of a hypervisor, IOMMU, or comparable trust boundary.\\nC:H - The stale inc-\u003ei_conn is dereferenced to read c_lcong from a freed 200-byte rds_connection, and the freed slot can be reclaimed with attacker-groomed data, giving a use-after-free read primitive usable to disclose kernel memory contents.\\nI:H - rds_inc_put() calls inc-\u003ei_conn-\u003ec_trans-\u003einc_free(inc) through a function pointer at offset 80 of the freed object \\u2014 an indirect call through freed memory that the commit calls a \\\"call-through-freed-object primitive\\\", which after heap reclamation is a control-flow hijack path leading to arbitrary kernel modification.\\nA:H - Dereferencing the freed rds_connection in rds_clear_recv_queue() and calling through its freed transport vtable reliably corrupts kernel state and panics the machine (KASAN-confirmed use-after-free), causing a full denial of service.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\", \"lessThan\": \"742ff6f02545212e991cd8b45011e40d2c2ef25a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\", \"lessThan\": \"abff41fd928328bbf3dda1140beb2e61fa424ccd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\", \"lessThan\": \"03c574112e5d066df0ddce36d7438e850bcf3050\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\", \"lessThan\": \"1e2e2d9806944fe485824d617c8b7c78116c22db\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\", \"lessThan\": \"cfb3ce07b705e486e022a2f2b1242b48f13981ff\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\", \"lessThan\": \"9591042533140dfe6608d9344806d567dcd39d02\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\", \"lessThan\": \"0f8690e3869109cd5803ccb400889d20a0b54e0e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c809195f5523dd4d09403bbb1c9732d548aa0d1e\", \"lessThan\": \"5521ae71e32a8069ed4ca6e792179dc57bc43ab2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c827073c95fde388bc65fe5227f944eaf859b9f0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4.17.19\", \"lessThan\": \"4.18\", \"versionType\": \"semver\"}], \"programFiles\": [\"net/rds/recv.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.18\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.265\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.216\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.183\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.148\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.101\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.42\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/rds/recv.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/742ff6f02545212e991cd8b45011e40d2c2ef25a\"}, {\"url\": \"https://git.kernel.org/stable/c/abff41fd928328bbf3dda1140beb2e61fa424ccd\"}, {\"url\": \"https://git.kernel.org/stable/c/03c574112e5d066df0ddce36d7438e850bcf3050\"}, {\"url\": \"https://git.kernel.org/stable/c/1e2e2d9806944fe485824d617c8b7c78116c22db\"}, {\"url\": \"https://git.kernel.org/stable/c/cfb3ce07b705e486e022a2f2b1242b48f13981ff\"}, {\"url\": \"https://git.kernel.org/stable/c/9591042533140dfe6608d9344806d567dcd39d02\"}, {\"url\": \"https://git.kernel.org/stable/c/0f8690e3869109cd5803ccb400889d20a0b54e0e\"}, {\"url\": \"https://git.kernel.org/stable/c/5521ae71e32a8069ed4ca6e792179dc57bc43ab2\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nrds: drop incoming messages that cross network namespace boundaries\\n\\nrds_find_bound() looks up the destination socket using a global\\nrhashtable keyed solely on (addr, port, scope_id).  Network namespaces\\nare not part of the key, so a sender in netns A can deliver an incoming\\nmessage (inc) to a socket that lives in a different netns B.\\n\\nWhen this happens, inc-\u003ei_conn points to an rds_connection whose c_net\\nis netns A, but the receiving rs lives in netns B.  Once the child\\nprocess that created netns A exits, cleanup_net() calls\\nrds_loop_exit_net() -\u003e rds_loop_kill_conns() -\u003e rds_conn_destroy(),\\nfreeing that connection.  If the survivor socket in netns B still holds\\nthe inc, any subsequent dereference of inc-\u003ei_conn is a use-after-free.\\n\\nThere are two dangerous sites in rds_clear_recv_queue():\\n  1. inc-\u003ei_conn-\u003ec_lcong (offset 88 of freed rds_connection, size 200)\\n     read via rds_recv_rcvbuf_delta() -- confirmed by KASAN.\\n  2. inc-\u003ei_conn-\u003ec_trans-\u003einc_free(inc) (function pointer at offset 80)\\n     called via rds_inc_put() when the inc refcount reaches zero -- same\\n     race window, potential call-through-freed-object primitive.\\n\\nThe bug is reachable from unprivileged user namespaces\\n(CLONE_NEWUSER + CLONE_NEWNET), available since Linux 3.8.\\n\\nFix this by rejecting the delivery in rds_recv_incoming() when the\\nsocket returned by rds_find_bound() belongs to a different network\\nnamespace than the connection that carried the message.  Use the\\nexisting rds_conn_net() / sock_net() helpers and net_eq() for the\\ncomparison.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.17.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:33:33.100Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68335\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T21:09:05.269Z\", \"dateReserved\": \"2026-07-30T09:28:09.383Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-10T12:03:11.547Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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