{"id":"CVE-2022-49973","title":"skmsg: Fix wrong last sg check in sk_msg_recvmsg()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nskmsg: Fix wrong last sg check in sk_msg_recvmsg()\n\nFix one kernel NULL pointer dereference as below:\n\n[  224.462334] Call Trace:\n[  224.462394]  __tcp_bpf_recvmsg+0xd3…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 293c53b7dbf9073cbcc488f938bc053ff4caeec0 < de22cba333d8699ad77e79f862fe1320cb1284de","Linux >= 1295dae30f30c3daa03005ed8958d44b17f037fd < 10ee118a1756141f8e9c87aa7344ed12b41630a8","Linux >= 9974d37ea75f01b47d16072b5dad305bd8d23fcc < 583585e48d965338e73e1eb383768d16e0922d73","Linux 4674c0da448b546e390a981b819cd4af5cb16cf9","Linux >= 5.18.18 < 5.19","Linux >= 5.15.61 < 5.15.66","Linux >= 5.19.2 < 5.19.8"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T19:52:17.325840Z"},"published":"2025-06-18","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:00:12.759Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-49973","references":[{"url":"https://git.kernel.org/stable/c/de22cba333d8699ad77e79f862fe1320cb1284de"},{"url":"https://git.kernel.org/stable/c/10ee118a1756141f8e9c87aa7344ed12b41630a8"},{"url":"https://git.kernel.org/stable/c/583585e48d965338e73e1eb383768d16e0922d73"}],"tags":["cve.org"],"epss":0.00243,"epssPercentile":0.15512,"ingestedAt":"2026-11-05T22:38:31.630Z","slug":"CVE-2022-49973","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nskmsg: Fix wrong last sg check in sk_msg_recvmsg()\n\nFix one kernel NULL pointer dereference as below:\n\n[  224.462334] Call Trace:\n[  224.462394]  __tcp_bpf_recvmsg+0xd3/0x380\n[  224.462441]  ? sock_has_perm+0x78/0xa0\n[  224.462463]  tcp_bpf_recvmsg+0x12e/0x220\n[  224.462494]  inet_recvmsg+0x5b/0xd0\n[  224.462534]  __sys_recvfrom+0xc8/0x130\n[  224.462574]  ? syscall_trace_enter+0x1df/0x2e0\n[  224.462606]  ? __do_page_fault+0x2de/0x500\n[  224.462635]  __x64_sys_recvfrom+0x24/0x30\n[  224.462660]  do_syscall_64+0x5d/0x1d0\n[  224.462709]  entry_SYSCALL_64_after_hwframe+0x65/0xca\n\nIn commit 9974d37ea75f (\"skmsg: Fix invalid last sg check in\nsk_msg_recvmsg()\"), we change last sg check to sg_is_last(),\nbut in sockmap redirection case (without stream_parser/stream_verdict/\nskb_verdict), we did not mark the end of the scatterlist. Check the\nsk_msg_alloc, sk_msg_page_add, and bpf_msg_push_data functions, they all\ndo not mark the end of sg. They are expected to use sg.end for end\njudgment. So the judgment of '(i != msg_rx->sg.end)' is added back here.\n\n## Affected\n\n- `Linux >= 293c53b7dbf9073cbcc488f938bc053ff4caeec0 < de22cba333d8699ad77e79f862fe1320cb1284de`\n- `Linux >= 1295dae30f30c3daa03005ed8958d44b17f037fd < 10ee118a1756141f8e9c87aa7344ed12b41630a8`\n- `Linux >= 9974d37ea75f01b47d16072b5dad305bd8d23fcc < 583585e48d965338e73e1eb383768d16e0922d73`\n- `Linux 4674c0da448b546e390a981b819cd4af5cb16cf9`\n- `Linux >= 5.18.18 < 5.19`\n- `Linux >= 5.15.61 < 5.15.66`\n- `Linux >= 5.19.2 < 5.19.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}