CVE-2026-68335

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68335", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.383Z", "datePublished": "2026-08-10T12:03:11.547Z", "dateUpdated": "2026-10-19T21:09:05.269Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:33:33.100Z"}, "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->i_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() -> rds_loop_kill_conns() -> rds_conn_destroy(),\nfreeing that connection. If the survivor socket in netns B still holds\nthe inc, any subsequent dereference of inc->i_conn is a use-after-free.\n\nThere are two dangerous sites in rds_clear_recv_queue():\n 1. inc->i_conn->c_lcong (offset 88 of freed rds_connection, size 200)\n read via rds_recv_rcvbuf_delta() -- confirmed by KASAN.\n 2. inc->i_conn->c_trans->inc_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."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "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->i_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->i_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->i_conn->c_trans->inc_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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/rds/recv.c"], "versions": [{"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "lessThan": "742ff6f02545212e991cd8b45011e40d2c2ef25a", "status": "affected", "versionType": "git"}, {"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "lessThan": "abff41fd928328bbf3dda1140beb2e61fa424ccd", "status": "affected", "versionType": "git"}, {"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "lessThan": "03c574112e5d066df0ddce36d7438e850bcf3050", "status": "affected", "versionType": "git"}, {"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "lessThan": "1e2e2d9806944fe485824d617c8b7c78116c22db", "status": "affected", "versionType": "git"}, {"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "lessThan": "cfb3ce07b705e486e022a2f2b1242b48f13981ff", "status": "affected", "versionType": "git"}, {"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "lessThan": "9591042533140dfe6608d9344806d567dcd39d02", "status": "affected", "versionType": "git"}, {"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "lessThan": "0f8690e3869109cd5803ccb400889d20a0b54e0e", "status": "affected", "versionType": "git"}, {"version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "lessThan": "5521ae71e32a8069ed4ca6e792179dc57bc43ab2", "status": "affected", "versionType": "git"}, {"version": "c827073c95fde388bc65fe5227f944eaf859b9f0", "status": "affected", "versionType": "git"}, {"version": "4.17.19", "lessThan": "4.18", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/rds/recv.c"], "versions": [{"version": "4.18", "status": "affected"}, {"version": "0", "lessThan": "4.18", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17.19"}]}]}], "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"}], "title": "rds: drop incoming messages that cross network namespace boundaries", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-68335", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:47:14.247347Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T21:09:05.269Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-68335", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:47:14.247347Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:47:14.831Z"}}], "cna": {"title": "rds: drop incoming messages that cross network namespace boundaries", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "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->i_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->i_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->i_conn->c_trans->inc_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->i_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() -> rds_loop_kill_conns() -> rds_conn_destroy(),\nfreeing that connection. If the survivor socket in netns B still holds\nthe inc, any subsequent dereference of inc->i_conn is a use-after-free.\n\nThere are two dangerous sites in rds_clear_recv_queue():\n 1. inc->i_conn->c_lcong (offset 88 of freed rds_connection, size 200)\n read via rds_recv_rcvbuf_delta() -- confirmed by KASAN.\n 2. inc->i_conn->c_trans->inc_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"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/rds/recv.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "742ff6f02545212e991cd8b45011e40d2c2ef25a", "status": "affected", "version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "versionType": "git"}, {"lessThan": "abff41fd928328bbf3dda1140beb2e61fa424ccd", "status": "affected", "version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "versionType": "git"}, {"lessThan": "03c574112e5d066df0ddce36d7438e850bcf3050", "status": "affected", "version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "versionType": "git"}, {"lessThan": "1e2e2d9806944fe485824d617c8b7c78116c22db", "status": "affected", "version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "versionType": "git"}, {"lessThan": "cfb3ce07b705e486e022a2f2b1242b48f13981ff", "status": "affected", "version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "versionType": "git"}, {"lessThan": "9591042533140dfe6608d9344806d567dcd39d02", "status": "affected", "version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "versionType": "git"}, {"lessThan": "0f8690e3869109cd5803ccb400889d20a0b54e0e", "status": "affected", "version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "versionType": "git"}, {"lessThan": "5521ae71e32a8069ed4ca6e792179dc57bc43ab2", "status": "affected", "version": "c809195f5523dd4d09403bbb1c9732d548aa0d1e", "versionType": "git"}, {"status": "affected", "version": "c827073c95fde388bc65fe5227f944eaf859b9f0", "versionType": "git"}, {"lessThan": "4.18", "status": "affected", "version": "4.17.19", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/rds/recv.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.18"}, {"lessThan": "4.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.148", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "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->i_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() -> rds_loop_kill_conns() -> rds_conn_destroy(),\nfreeing that connection. If the survivor socket in netns B still holds\nthe inc, any subsequent dereference of inc->i_conn is a use-after-free.\n\nThere are two dangerous sites in rds_clear_recv_queue():\n 1. inc->i_conn->c_lcong (offset 88 of freed rds_connection, size 200)\n read via rds_recv_rcvbuf_delta() -- confirmed by KASAN.\n 2. inc->i_conn->c_trans->inc_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."}], "id": "CVE-2026-68335", "lastModified": "2026-10-19T22:17:13.720", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-68335", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:47:14.247347Z", "version": "2.0.3"}}]}, "published": "2026-08-10T13:20:23.863", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: Linux kernel RDS: Use-after-free due to cross-network namespace message delivery", "id": "2513170", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513170"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nrds: drop incoming messages that cross network namespace boundaries\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.\nWhen this happens, inc->i_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() -> rds_loop_kill_conns() -> rds_conn_destroy(),\nfreeing that connection. If the survivor socket in netns B still holds\nthe inc, any subsequent dereference of inc->i_conn is a use-after-free.\nThere are two dangerous sites in rds_clear_recv_queue():\n1. inc->i_conn->c_lcong (offset 88 of freed rds_connection, size 200)\nread via rds_recv_rcvbuf_delta() -- confirmed by KASAN.\n2. inc->i_conn->c_trans->inc_free(inc) (function pointer at offset 80)\ncalled via rds_inc_put() when the inc refcount reaches zero -- same\nrace window, potential call-through-freed-object primitive.\nThe bug is reachable from unprivileged user namespaces\n(CLONE_NEWUSER + CLONE_NEWNET), available since Linux 3.8.\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.", "A flaw was found in the Linux kernel's Reliable Datagram Sockets (RDS) component. The RDS component incorrectly handles incoming messages that cross network namespace boundaries, allowing a sender in one network namespace to deliver a message to a socket in a different network namespace. This can lead to a use-after-free vulnerability when the sender's network namespace is removed, freeing the associated connection while the receiving socket still holds a reference. A local unprivileged attacker can exploit this to achieve information disclosure or potentially execute arbitrary code."], "name": "CVE-2026-68335", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T12:03:11Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68335\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68335\nhttps://git.kernel.org/stable/c/0f8690e3869109cd5803ccb400889d20a0b54e0e\nhttps://git.kernel.org/stable/c/1e2e2d9806944fe485824d617c8b7c78116c22db\nhttps://git.kernel.org/stable/c/5521ae71e32a8069ed4ca6e792179dc57bc43ab2\nhttps://git.kernel.org/stable/c/9591042533140dfe6608d9344806d567dcd39d02\nhttps://git.kernel.org/stable/c/cfb3ce07b705e486e022a2f2b1242b48f13981ff"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c809195f5523dd4d09403bbb1c9732d548aa0d1e,1e2e2d9806944fe485824d617c8b7c78116c22db)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c809195f5523dd4d09403bbb1c9732d548aa0d1e,cfb3ce07b705e486e022a2f2b1242b48f13981ff)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c809195f5523dd4d09403bbb1c9732d548aa0d1e,9591042533140dfe6608d9344806d567dcd39d02)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c809195f5523dd4d09403bbb1c9732d548aa0d1e,0f8690e3869109cd5803ccb400889d20a0b54e0e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c809195f5523dd4d09403bbb1c9732d548aa0d1e,5521ae71e32a8069ed4ca6e792179dc57bc43ab2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "c827073c95fde388bc65fe5227f944eaf859b9f0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.17.19,4.18)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.148,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.101,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.42,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.6,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T17:30:17.999177+00:00", "updated": "2026-10-20T10:45:13.780096+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}