# CVE-2022-49802: linux: In the Linux kernel, the following vulnerability has been resolved:  ftrace: Fix null pointer dereference in ftrace_a...

CVE-2022-49802 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49802, released May 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49802
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.10-1 | [DEBIAN-CVE-2022-49802](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49802.md) | May 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.10-1 | [DEBIAN-CVE-2022-49802](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49802.md) | May 1, 2025 |
| Linux | linux Debian 14 | 6.0.10-1 | [DEBIAN-CVE-2022-49802](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49802.md) | May 1, 2025 |

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