{"id":"CVE-2022-49979","revision":null,"records":[{"revision":"36c05fd9b58241589494d2b847c988b9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2022-49979","aliases":[],"title":"net: fix refcount bug in sk_psock_get (2)","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix refcount bug in sk_psock_get (2)\n\nSyzkaller reports refcount bug as follows:\n------------[ cut here ]------------\nrefcount_t: saturated; leaking memory.\nWARNING: CPU: 1 PID: 3605 at lib/refcount.c:19 refcount_warn_saturate+0xf4/0x1e0 lib/refcount.c:19\nModules linked in:\nCPU: 1 PID: 3605 Comm: syz-executor208 Not tainted 5.18.0-syzkaller-03023-g7e062cda7d90 #0\n \n __refcount_add_not_zero include/linux/refcount.h:163 [inline]\n __refcount_inc_not_zero include/linux/refcount.h:227 [inline]\n refcount_inc_not_zero include/linux/refcount.h:245 [inline]\n sk_psock_get+0x3bc/0x410 include/linux/skmsg.h:439\n tls_data_ready+0x6d/0x1b0 net/tls/tls_sw.c:2091\n tcp_data_ready+0x106/0x520 net/ipv4/tcp_input.c:4983\n tcp_data_queue+0x25f2/0x4c90 net/ipv4/tcp_input.c:5057\n tcp_rcv_state_process+0x1774/0x4e80 net/ipv4/tcp_input.c:6659\n tcp_v4_do_rcv+0x339/0x980 net/ipv4/tcp_ipv4.c:1682\n sk_backlog_rcv include/net/sock.h:1061 [inline]\n __release_sock+0x134/0x3b0 net/core/sock.c:2849\n release_sock+0x54/0x1b0 net/core/sock.c:3404\n inet_shutdown+0x1e0/0x430 net/ipv4/af_inet.c:909\n __sys_shutdown_sock net/socket.c:2331 [inline]\n __sys_shutdown_sock net/socket.c:2325 [inline]\n __sys_shutdown+0xf1/0x1b0 net/socket.c:2343\n __do_sys_shutdown net/socket.c:2351 [inline]\n __se_sys_shutdown net/socket.c:2349 [inline]\n __x64_sys_shutdown+0x50/0x70 net/socket.c:2349\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n \n\nDuring SMC fallback process in connect syscall, kernel will\nreplaces TCP with SMC. In order to forward wakeup\nsmc socket waitqueue after fallback, kernel will sets\nclcsk->sk_user_data to origin smc socket in\nsmc_fback_replace_callbacks().\n\nLater, in shutdown syscall, kernel will calls\nsk_psock_get(), which treats the clcsk->sk_user_data\nas psock type, triggering the refcnt warning.\n\nSo, the root cause is that smc and psock, both will use\nsk_user_data field. So they will mismatch this field\neasily.\n\nThis patch solves it by using another bit(defined as\nSK_USER_DATA_PSOCK) in PTRMASK, to mark whether\nsk_user_data points to a psock object or not.\nThis patch depends on a PTRMASK introduced in commit f1ff5ce2cd5e\n(\"net, sk_msg: Clear sk_user_data pointer on clone if tagged\").\n\nFor there will possibly be more flags in the sk_user_data field,\nthis patch also refactor sk_user_data flags code to be more generic\nto improve its maintainability.","state":0,"publishedAt":"2025-06-18T11:00:41.513+00:00","modifiedAt":"2026-10-15T21:31:18.017+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 \"include/linux/skmsg.h\",\n \"include/net/sock.h\",\n \"net/core/skmsg.c\"\n ],\n \"versions\": [\n {\n \"version\": \"0ef6049f664941bc0f75828b3a61877635048b27\",\n \"lessThan\": \"a5d1cb908131e939bd8b63b8e5e23365bbc2edaf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"341adeec9adad0874f29a0a1af35638207352a39\",\n \"lessThan\": \"86026be8535c16fcc5e4f960286faf04d7f77815\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"341adeec9adad0874f29a0a1af35638207352a39\",\n \"lessThan\": \"2a0133723f9ebeb751cfce19f74ec07e108bef1f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"504078fbe9dd570d685361b57784a6050bc40aaa\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.15.22\",\n \"lessThan\": \"5.15.65\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.16.8\",\n \"lessThan\": \"5.17\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\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 \"include/linux/skmsg.h\",\n \"include/net/sock.h\",\n \"net/core/skmsg.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.17\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.17\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.65\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.19.7\",\n \"lessThanOrEqual\": \"5.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.0\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/a5d1cb908131e939bd8b63b8e5e23365bbc2edaf","https://git.kernel.org/stable/c/86026be8535c16fcc5e4f960286faf04d7f77815","https://git.kernel.org/stable/c/2a0133723f9ebeb751cfce19f74ec07e108bef1f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-49979","license":"CVE Program Terms of Use","key":"cve-program:CVE-2022-49979","identifiers":["CVE-2022-49979"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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