{"cve":"CVE-2022-49837","nvd":{"published":"2025-05-01T15:16:07.187","modified":"2026-06-17T05:19:15.730","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix memory leaks in __check_func_call\n\nkmemleak reports this issue:\n\nunreferenced object 0xffff88817139d000 (size 2048):\n  comm \"test_progs\", pid 33246, jiffies 4307381979 (age 45851.820s)\n  hex dump (first 32 bytes):\n    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [<0000000045f075f0>] kmalloc_trace+0x27/0xa0\n    [<0000000098b7c90a>] __check_func_call+0x316/0x1230\n    [<00000000b4c3c403>] check_helper_call+0x172e/0x4700\n    [<00000000aa3875b7>] do_check+0x21d8/0x45e0\n    [<000000001147357b>] do_check_common+0x767/0xaf0\n    [<00000000b5a595b4>] bpf_check+0x43e3/0x5bc0\n    [<0000000011e391b1>] bpf_prog_load+0xf26/0x1940\n    [<0000000007f765c0>] __sys_bpf+0xd2c/0x3650\n    [<00000000839815d6>] __x64_sys_bpf+0x75/0xc0\n    [<00000000946ee250>] do_syscall_64+0x3b/0x90\n    [<0000000000506b7f>] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe root case here is: In function prepare_func_exit(), the callee is\nnot released in the abnormal scenario after \"state->curframe--;\". To\nfix, move \"state->curframe--;\" to the very bottom of the function,\nright when we free callee and reset frame[] pointer to NULL, as Andrii\nsuggested.\n\nIn addition, function __check_func_call() has a similar problem. In\nthe abnormal scenario before \"state->curframe++;\", the callee also\nshould be released by free_func_state().","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-401"],"references":["https://git.kernel.org/stable/c/83946d772e756734a900ef99dbe0aeda506adf37","https://git.kernel.org/stable/c/d4944497827a3d14bc5a26dbcfb7433eb5a956c0","https://git.kernel.org/stable/c/eb86559a691cea5fa63e57a03ec3dc9c31e97955"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:01:22.920403922+00:00"},"epss":{"cve":"CVE-2022-49837","score":0.00199,"percentile":0.0979,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}