ftrace: Fix null pointer dereference in ftrace_add_mod()
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 4 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-476.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.13 and later | 4.14.300, 4.19.267, 5.4.225, 5.10.156, 5.15.80, 6.0.10, 6.1 | Patch available | CNA |
- Linux VendorLinux Affected 4.13 and later Fixed in 4.14.300, 4.19.267, 5.4.225, 5.10.156, 5.15.80, 6.0.10, 6.1 Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.13 to before 4.14.300; 4.15 to before 4.19.267; 4.20 to before 5.4.225; 5.5 to before 5.10.156; 5.11 to before 5.15.80; 5.16 to before 6.0.10 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:* | 6.1 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:* | 6.1 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:* | 6.1 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:* | 6.1 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:* | 6.1 rc5 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.13 to before 4.14.300; 4.15 to before 4.19.267; 4.20 to before 5.4.225; 5.5 to before 5.10.156; 5.11 to before 5.15.80; 5.16 to before 6.0.10 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:* Versions 6.1 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:* Versions 6.1 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:* Versions 6.1 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:* Versions 6.1 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:* Versions 6.1 rc5 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.14.300, 4.19.267, 5.4.225, 5.10.156, 5.15.80, 6.0.10, 6.1
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Enterprise Linux 10
Timeline
- 2026-10-02 Threatist record created from CVE-2022-49802
- 2026-10-03 Alias added: GHSA-5fcv-vwgv-jrcx
- 2026-11-05 CISA SSVC decision points changed
References
Patch 7
- https://git.kernel.org/stable/c/665b4c6648bf2b91f69b33817f4321cf4c3cafe9
- https://git.kernel.org/stable/c/b5bfc61f541d3f092b13dedcfe000d86eb8e133c
- https://git.kernel.org/stable/c/f715f31559b82e3f75ce047fa476de63d8107584
- https://git.kernel.org/stable/c/6a14828caddad0d989495a72af678adf60992704
- https://git.kernel.org/stable/c/1bea037a1abb23a6729bef36a2265a4565f5ea77
- https://git.kernel.org/stable/c/6e50eb4b1807017f6c2d5089064256ce2de8aef1
- https://git.kernel.org/stable/c/19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2022-49802 · CVE Program
- CVE-2022-49802 · NVD
- FIRST EPSS
- GHSA-5fcv-vwgv-jrcx · GitHub Advisory Database · CC BY 4.0
- CVE-2022-49802 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences