CVE-2022-49802

MEDIUM EPSS 8.0%
Published May 1, 20251y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 1, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
8.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥4.13  –  <4.14.300
linuxlinux_kernel*≥4.15  –  <4.19.267
linuxlinux_kernel*≥4.20  –  <5.4.225
linuxlinux_kernel*≥5.5  –  <5.10.156
linuxlinux_kernel*≥5.11  –  <5.15.80
linuxlinux_kernel*≥5.16  –  <6.0.10
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any

References 7

  • git.kernel.org https://git.kernel.org/stable/c/19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1bea037a1abb23a6729bef36a2265a4565f5ea77
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/665b4c6648bf2b91f69b33817f4321cf4c3cafe9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6a14828caddad0d989495a72af678adf60992704
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6e50eb4b1807017f6c2d5089064256ce2de8aef1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b5bfc61f541d3f092b13dedcfe000d86eb8e133c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f715f31559b82e3f75ce047fa476de63d8107584
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1bea037a1abb23a6729bef36a2265a4565f5ea77
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/665b4c6648bf2b91f69b33817f4321cf4c3cafe9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6a14828caddad0d989495a72af678adf60992704
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6e50eb4b1807017f6c2d5089064256ce2de8aef1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b5bfc61f541d3f092b13dedcfe000d86eb8e133c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f715f31559b82e3f75ce047fa476de63d8107584
    Patch