{"id":"CVE-2026-52938","summary":"bpf: Fix NULL pointer dereference in bpf_sk_storage_clone and diag paths","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix NULL pointer dereference in bpf_sk_storage_clone and diag paths\n\nbpf_selem_unlink_nofail() sets SDATA(selem)-\u003esmap to NULL before\nremoving the selem from the storage hlist. A concurrent RCU reader in\nbpf_sk_storage_clone() can observe the selem still on the list with\nsmap already NULL, causing a NULL pointer dereference.\n\n general protection fault, probably for non-canonical address 0xdffffc000000000a:\n KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]\n RIP: 0010:bpf_sk_storage_clone+0x1cd/0xaa0 net/core/bpf_sk_storage.c:174\n Call Trace:\n  \u003cIRQ\u003e\n  sk_clone+0xfed/0x1980 net/core/sock.c:2591\n  inet_csk_clone_lock+0x30/0x760 net/ipv4/inet_connection_sock.c:1222\n  tcp_create_openreq_child+0x35/0x2680 net/ipv4/tcp_minisocks.c:571\n  tcp_v4_syn_recv_sock+0x123/0xf90 net/ipv4/tcp_ipv4.c:1729\n  tcp_check_req+0x8e1/0x2580 include/net/tcp.h:855\n  tcp_v4_rcv+0x1845/0x3b80 net/ipv4/tcp_ipv4.c:2347\n\nAdd a NULL check for smap in bpf_sk_storage_clone().\n\nbpf_sk_storage_diag_put_all() has the same issue. Add a NULL check\nand pass the validated smap directly to diag_get(), which is refactored\nto take smap as a parameter instead of reading it internally.\n\nbpf_sk_storage_diag_put() uses diag-\u003emaps[i] which is always valid\nunder its refcount, so diag-\u003emaps[i] is passed directly to diag_get().","modified":"2026-07-10T03:53:52.139251705Z","published":"2026-06-24T07:14:27.952Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52938.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/16af24fea29c209dea53595c99f6da9398548e1b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/375e4e33c18dfa05c5dfd5f3dfffeb29343dd4c7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52938.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52938"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5d800f87d0a5ea1b156c47a4b9fd128479335153"},{"fixed":"16af24fea29c209dea53595c99f6da9398548e1b"},{"fixed":"375e4e33c18dfa05c5dfd5f3dfffeb29343dd4c7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52938.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.0.0"},{"fixed":"7.0.14"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52938.json"}}],"schema_version":"1.7.5"}