CVE-2026-68335 (GCVE-0-2026-68335)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:03 – Updated: 2026-08-19 16:33
VLAI
Title
rds: drop incoming messages that cross network namespace boundaries
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c809195f5523dd4d09403bbb1c9732d548aa0d1e , < 742ff6f02545212e991cd8b45011e40d2c2ef25a (git)
Affected: c809195f5523dd4d09403bbb1c9732d548aa0d1e , < abff41fd928328bbf3dda1140beb2e61fa424ccd (git)
Affected: c809195f5523dd4d09403bbb1c9732d548aa0d1e , < 03c574112e5d066df0ddce36d7438e850bcf3050 (git)
Affected: c809195f5523dd4d09403bbb1c9732d548aa0d1e , < 1e2e2d9806944fe485824d617c8b7c78116c22db (git)
Affected: c809195f5523dd4d09403bbb1c9732d548aa0d1e , < cfb3ce07b705e486e022a2f2b1242b48f13981ff (git)
Affected: c809195f5523dd4d09403bbb1c9732d548aa0d1e , < 9591042533140dfe6608d9344806d567dcd39d02 (git)
Affected: c809195f5523dd4d09403bbb1c9732d548aa0d1e , < 0f8690e3869109cd5803ccb400889d20a0b54e0e (git)
Affected: c809195f5523dd4d09403bbb1c9732d548aa0d1e , < 5521ae71e32a8069ed4ca6e792179dc57bc43ab2 (git)
Affected: c827073c95fde388bc65fe5227f944eaf859b9f0 (git)
Affected: 4.17.19 , < 4.18 (semver)
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Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "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."
        }
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        {
          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - Exploitation requires local syscall access: the attacker must create RDS sockets and a network namespace (CLONE_NEWUSER|CLONE_NEWNET), then trigger namespace teardown to free the connection. A remote RDS peer cannot drive the netns-destruction half of the sequence, so the vulnerability is reachable only locally.\nAC:L - The attacker controls the entire sequence deterministically \u2014 bind a socket in one netns, send a loopback RDS message from a second netns so the inc is queued cross-netns, then exit that netns to free inc-\u003ei_conn. 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."
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        "dateUpdated": "2026-08-19T16:33:33.100Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/abff41fd928328bbf3dda1140beb2e61fa424ccd"
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        {
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          "url": "https://git.kernel.org/stable/c/9591042533140dfe6608d9344806d567dcd39d02"
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        {
          "url": "https://git.kernel.org/stable/c/0f8690e3869109cd5803ccb400889d20a0b54e0e"
        },
        {
          "url": "https://git.kernel.org/stable/c/5521ae71e32a8069ed4ca6e792179dc57bc43ab2"
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      ],
      "title": "rds: drop incoming messages that cross network namespace boundaries",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68335",
    "datePublished": "2026-08-10T12:03:11.547Z",
    "dateReserved": "2026-07-30T09:28:09.383Z",
    "dateUpdated": "2026-08-19T16:33:33.100Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2026-68335",
      "date": "2026-08-20",
      "epss": "0.00135",
      "percentile": "0.03416"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-68335\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-10T13:20:23.863\",\"lastModified\":\"2026-08-19T17:20:43.490\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/rds/recv.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/rds/recv.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/03c574112e5d066df0ddce36d7438e850bcf3050\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0f8690e3869109cd5803ccb400889d20a0b54e0e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1e2e2d9806944fe485824d617c8b7c78116c22db\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5521ae71e32a8069ed4ca6e792179dc57bc43ab2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/742ff6f02545212e991cd8b45011e40d2c2ef25a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9591042533140dfe6608d9344806d567dcd39d02\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/abff41fd928328bbf3dda1140beb2e61fa424ccd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cfb3ce07b705e486e022a2f2b1242b48f13981ff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-14T05:59:34+00:00",
      "cve": "CVE-2026-68335",
      "id": "CVE-2026-68335",
      "initial_release_date": "2026-08-10T12:03:11.547000+00:00",
      "product_status:known_affected": "155",
      "product_status:known_not_affected": "107",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel RDS: Use-after-free due to cross-network namespace message delivery",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68335.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-11T23:47:26Z",
      "cve": "CVE-2026-68335",
      "id": "CVE-2026-68335",
      "initial_release_date": "2026-08-11T23:47:26Z",
      "product_status:known_affected": "243",
      "product_status:known_not_affected": "53",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68335",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68335.json",
      "version": "2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.