{"id":"CVE-2022-49802","title":"ftrace: Fix null pointer dereference in ftrace_add_mod()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Fix null pointer dereference in ftrace_add_mod()\n\nThe @ftrace_mod is allocated by kzalloc(), so both the members {prev,next}\nof @ftrace_mode->list are NULL, it'…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < 665b4c6648bf2b91f69b33817f4321cf4c3cafe9","Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < b5bfc61f541d3f092b13dedcfe000d86eb8e133c","Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < f715f31559b82e3f75ce047fa476de63d8107584","Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < 6a14828caddad0d989495a72af678adf60992704","Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < 1bea037a1abb23a6729bef36a2265a4565f5ea77","Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < 6e50eb4b1807017f6c2d5089064256ce2de8aef1","Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < 19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0","Linux 4.13"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T19:48:54.647011Z"},"published":"2025-05-01","updated":"2026-11-05","sourceUpdated":"2026-11-05T19:49:50.009Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-49802","references":[{"url":"https://git.kernel.org/stable/c/665b4c6648bf2b91f69b33817f4321cf4c3cafe9"},{"url":"https://git.kernel.org/stable/c/b5bfc61f541d3f092b13dedcfe000d86eb8e133c"},{"url":"https://git.kernel.org/stable/c/f715f31559b82e3f75ce047fa476de63d8107584"},{"url":"https://git.kernel.org/stable/c/6a14828caddad0d989495a72af678adf60992704"},{"url":"https://git.kernel.org/stable/c/1bea037a1abb23a6729bef36a2265a4565f5ea77"},{"url":"https://git.kernel.org/stable/c/6e50eb4b1807017f6c2d5089064256ce2de8aef1"},{"url":"https://git.kernel.org/stable/c/19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0"}],"tags":["cve.org"],"epss":0.00222,"epssPercentile":0.12907,"ingestedAt":"2026-11-05T22:38:31.598Z","slug":"CVE-2022-49802","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Fix null pointer dereference in ftrace_add_mod()\n\nThe @ftrace_mod is allocated by kzalloc(), so both the members {prev,next}\nof @ftrace_mode->list are NULL, it's not a valid state to call list_del().\nIf kstrdup() for @ftrace_mod->{func|module} fails, it goes to @out_free\ntag and calls free_ftrace_mod() to destroy @ftrace_mod, then list_del()\nwill write prev->next and next->prev, where null pointer dereference\nhappens.\n\nBUG: kernel NULL pointer dereference, address: 0000000000000008\nOops: 0002 [#1] PREEMPT SMP NOPTI\nCall Trace:\n <TASK>\n ftrace_mod_callback+0x20d/0x220\n ? do_filp_open+0xd9/0x140\n ftrace_process_regex.isra.51+0xbf/0x130\n ftrace_regex_write.isra.52.part.53+0x6e/0x90\n vfs_write+0xee/0x3a0\n ? __audit_filter_op+0xb1/0x100\n ? auditd_test_task+0x38/0x50\n ksys_write+0xa5/0xe0\n do_syscall_64+0x3a/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\nKernel panic - not syncing: Fatal exception\n\nSo call INIT_LIST_HEAD() to initialize the list member to fix this issue.\n\n## Affected\n\n- `Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < 665b4c6648bf2b91f69b33817f4321cf4c3cafe9`\n- `Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < b5bfc61f541d3f092b13dedcfe000d86eb8e133c`\n- `Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < f715f31559b82e3f75ce047fa476de63d8107584`\n- `Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < 6a14828caddad0d989495a72af678adf60992704`\n- `Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < 1bea037a1abb23a6729bef36a2265a4565f5ea77`\n- `Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < 6e50eb4b1807017f6c2d5089064256ce2de8aef1`\n- `Linux >= 673feb9d76ab3eddde7acfd94b206e321cfc90b9 < 19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0`\n- `Linux 4.13`\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":[]}