CVE-2026-43409

MEDIUM EPSS 2.3%
Published May 8, 20261mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 8, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: kprobes: avoid crash when rmmod/insmod after ftrace killed After we hit ftrace is killed by some errors, the kernel crash if we remove modules in which kprobe probes. BUG: unable to handle page fault for address: fffffbfff805000d PGD 817fcc067 P4D 817fcc067 PUD 817fc8067 PMD 101555067 PTE 0 Oops: Oops: 0000 [#1] SMP KASAN PTI CPU: 4 UID: 0 PID: 2012 Comm: rmmod Tainted: G W OE Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE RIP: 0010:kprobes_module_callback+0x89/0x790 RSP: 0018:ffff88812e157d30 EFLAGS: 00010a02 RAX: 1ffffffff805000d RBX: dffffc0000000000 RCX: ffffffff86a8de90 RDX: ffffed1025c2af9b RSI: 0000000000000008 RDI: ffffffffc0280068 RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1025c2af9a R10: ffff88812e157cd7 R11: 205d323130325420 R12: 0000000000000002 R13: ffffffffc0290488 R14: 0000000000000002 R15: ffffffffc0280040 FS: 00007fbc450dd740(0000) GS:ffff888420331000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffbfff805000d CR3: 000000010f624000 CR4: 00000000000006f0 Call Trace: <TASK> notifier_call_chain+0xc6/0x280 blocking_notifier_call_chain+0x60/0x90 __do_sys_delete_module.constprop.0+0x32a/0x4e0 do_syscall_64+0x5d/0xfa0 entry_SYSCALL_64_after_hwframe+0x76/0x7e This is because the kprobe on ftrace does not correctly handles the kprobe_ftrace_disabled flag set by ftrace_kill(). To prevent this error, check kprobe_ftrace_disabled in __disarm_kprobe_ftrace() and skip all ftrace related operations.

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
2.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥3.7  –  <6.6.130
linuxlinux_kernel*≥6.7  –  <6.12.78
linuxlinux_kernel*≥6.13  –  <6.18.19
linuxlinux_kernel*≥6.19  –  <6.19.9
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 5

  • git.kernel.org https://git.kernel.org/stable/c/8b6767e4141b2a42745b544d4555cf1614ba1a2d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9edc79d664832a842012ad105b1521c1a3c35ab3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b0ca81616a010807e91fc31db9be242b96326adc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cae928e3178c75602c21d67e21255d73e7e9ed4f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e113f0b46d19626ec15388bcb91432c9a4fd6261
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/8b6767e4141b2a42745b544d4555cf1614ba1a2d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9edc79d664832a842012ad105b1521c1a3c35ab3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b0ca81616a010807e91fc31db9be242b96326adc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cae928e3178c75602c21d67e21255d73e7e9ed4f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e113f0b46d19626ec15388bcb91432c9a4fd6261
    Patch