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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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        {
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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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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        "shortName": "Linux"
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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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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": "Important",
      "current_release_date": "2026-09-01T07:34:32+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": "169",
      "product_status:known_not_affected": "108",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: rds: drop incoming messages that cross network namespace boundaries",
      "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": "2026-09-15T01:36:04Z",
      "cve": "CVE-2026-68335",
      "id": "CVE-2026-68335",
      "initial_release_date": "2026-08-11T23:47:26Z",
      "product_status:first_fixed": "65",
      "product_status:known_affected": "650",
      "product_status:known_not_affected": "97",
      "product_status:recommended": "42",
      "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": "7"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.