CVE-2022-49802
ftrace: Fix null pointer dereference in ftrace_add_mod()
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: ftrace: Fix null pointer dereference in ftrace_add_mod() The @ftrace_mod is allocated by kzalloc(), so both the members {prev,next} of @ftrace_mode->list are NULL, it's not a valid state to call list_del(). If kstrdup() for @ftrace_mod->{func|module} fails, it goes to @out_free tag and calls free_ftrace_mod() to destroy @ftrace_mod, then list_del() will write prev->next and next->prev, where null pointer dereference happens. BUG: kernel NULL pointer dereference, address: 0000000000000008 Oops: 0002 [#1] PREEMPT SMP NOPTI Call Trace: <TASK> ftrace_mod_callback+0x20d/0x220 ? do_filp_open+0xd9/0x140 ftrace_process_regex.isra.51+0xbf/0x130 ftrace_regex_write.isra.52.part.53+0x6e/0x90 vfs_write+0xee/0x3a0 ? __audit_filter_op+0xb1/0x100 ? auditd_test_task+0x38/0x50 ksys_write+0xa5/0xe0 do_syscall_64+0x3a/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Kernel panic - not syncing: Fatal exception So call INIT_LIST_HEAD() to initialize the list member to fix this issue.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.22% · top 87% of all CVEs (5 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected 673feb9d76ab3eddde7acfd94b206e321cfc90b9 – < 665b4c6648bf2b91f69b33817f4321cf4c3cafe9
- affected 673feb9d76ab3eddde7acfd94b206e321cfc90b9 – < b5bfc61f541d3f092b13dedcfe000d86eb8e133c
- affected 673feb9d76ab3eddde7acfd94b206e321cfc90b9 – < f715f31559b82e3f75ce047fa476de63d8107584
- affected 673feb9d76ab3eddde7acfd94b206e321cfc90b9 – < 6a14828caddad0d989495a72af678adf60992704
- affected 673feb9d76ab3eddde7acfd94b206e321cfc90b9 – < 1bea037a1abb23a6729bef36a2265a4565f5ea77
- affected 673feb9d76ab3eddde7acfd94b206e321cfc90b9 – < 6e50eb4b1807017f6c2d5089064256ce2de8aef1
- affected 673feb9d76ab3eddde7acfd94b206e321cfc90b9 – < 19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0
- affected 4.13
- unaffected < 4.13
- unaffected 4.14.300 – ≤ 4.14.*
- unaffected 4.19.267 – ≤ 4.19.*
- unaffected 5.4.225 – ≤ 5.4.*
- unaffected 5.10.156 – ≤ 5.10.*
- unaffected 5.15.80 – ≤ 5.15.*
- unaffected 6.0.10 – ≤ 6.0.*
- unaffected 6.1 – ≤ *
References (7)
- https://git.kernel.org/stable/c/665b4c6648bf2b91f69b33817f4321cf4c3cafe9 (opens in a new tab)
- https://git.kernel.org/stable/c/b5bfc61f541d3f092b13dedcfe000d86eb8e133c (opens in a new tab)
- https://git.kernel.org/stable/c/f715f31559b82e3f75ce047fa476de63d8107584 (opens in a new tab)
- https://git.kernel.org/stable/c/6a14828caddad0d989495a72af678adf60992704 (opens in a new tab)
- https://git.kernel.org/stable/c/1bea037a1abb23a6729bef36a2265a4565f5ea77 (opens in a new tab)
- https://git.kernel.org/stable/c/6e50eb4b1807017f6c2d5089064256ce2de8aef1 (opens in a new tab)
- https://git.kernel.org/stable/c/19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-49802)Record last updated .