CVE-2026-43409

kprobes: avoid crash when rmmod/insmod after ftrace killed

MEDIUM

5.5

CVSS Score

Published: May 8, 2026 at 02:21 PM UTC

Updated: June 17, 2026 at 10:49 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

3.7 ≤ v < 6.12.783.7 ≤ v < 6.18.193.7 ≤ v < 6.19.93.7 ≤ v < 6.6.1303.7 ≤ v < 7.06.13 ≤ v < 6.18.196.19 ≤ v < 6.19.96.7 ≤ v < 6.12.783.7 7.0 rc1 7.0 rc2 7.0 rc3ae6aa16fdc163afe6b04b6c073ad4ddd4663c03b

Vendor states this is fixed in 8b6767e4141b2a42745b544d4555cf1614ba1a2d (fixed)

Vendor states this is fixed in 9edc79d664832a842012ad105b1521c1a3c35ab3 (fixed)

Vendor states this is fixed in b0ca81616a010807e91fc31db9be242b96326adc (fixed)

Vendor states this is fixed in cae928e3178c75602c21d67e21255d73e7e9ed4f (fixed)

Vendor states this is fixed in e113f0b46d19626ec15388bcb91432c9a4fd6261 (fixed)

Vendor states this is fixed in 3.7 (unaffected)

Vendor states this is fixed in 6.12.78 (unaffected)

Vendor states this is fixed in 6.18.19 (unaffected)

Vendor states this is fixed in 6.19.9 (unaffected)

Vendor states this is fixed in 6.6.130 (unaffected)

Vendor states this is fixed in 7.0 (unaffected)