{"id":"CVE-2026-99138","revision":"15580e3d54d4419fabfd636c18dcdf92","records":[{"revision":"15580e3d54d4419fabfd636c18dcdf92","observedAt":"2026-10-28T11:27:43.363+00:00","statement":{"source":"cve-program","id":"CVE-2026-99138","aliases":[],"title":"tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)\n\ndo_tcp_getsockopt() reads icsk->icsk_ca_ops and dereferences the\nget_info function pointer without rcu_read_lock(). With BPF struct_ops\ncongestion control, ca_ops can point to dynamically allocated memory\nthat is freed concurrently, resulting in a use-after-free when the\nkernel dereferences or calls through the stale pointer.\n\n  BUG: KASAN: slab-use-after-free in do_tcp_getsockopt+0x2037/0x23e0\n  Read of size 8 at addr ffff888013701258 by task exploit/149\n   do_tcp_getsockopt+0x2037/0x23e0 (net/ipv4/tcp.c:4564)\n   tcp_getsockopt+0x91/0xf0\n   __sys_getsockopt+0xf7/0x170\n\nFix this by wrapping the ca_ops load and get_info call within\nrcu_read_lock()/rcu_read_unlock(), and using READ_ONCE() to load\nthe icsk_ca_ops pointer.","state":0,"publishedAt":"2026-10-28T10:34:49.993+00:00","modifiedAt":"2026-10-28T10:34:49.993+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv4/tcp.c\",\n                        \"net/ipv4/tcp_dctcp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2\",\n                            \"lessThan\": \"86814e5370068ec2bf0caa6e6d55c3e5bfc6c324\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2\",\n                            \"lessThan\": \"39aa489e85752f9de214edb0f85e4d578e57af29\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2\",\n                            \"lessThan\": \"385e474086c2e7e29e2dded690be40dc273e20ee\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv4/tcp.c\",\n                        \"net/ipv4/tcp_dctcp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.59\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.13\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/86814e5370068ec2bf0caa6e6d55c3e5bfc6c324","https://git.kernel.org/stable/c/39aa489e85752f9de214edb0f85e4d578e57af29","https://git.kernel.org/stable/c/385e474086c2e7e29e2dded690be40dc273e20ee"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99138","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-99138","identifiers":["CVE-2026-99138"]},"retained":false,"historicalAffected":[]}],"coverage":[]}