# CVE-2022-49797: tracing: kprobe: Fix potential null-ptr-deref on trace_event_file in kprobe_event_gen_test_exit()

Status: published. Published: 2025-05-01. Updated: 2026-11-05.

In the Linux kernel, the following vulnerability has been resolved:

tracing: kprobe: Fix potential null-ptr-deref on trace_event_file in kprobe_event_gen_test_exit()

When trace_get_event_file() failed, gen_kretprobe_test will be assigned
as the error code. If module kprobe_event_gen_test is removed now, the
null pointer dereference will happen in kprobe_event_gen_test_exit().
Check if gen_kprobe_test or gen_kretprobe_test is error code or NULL
before dereference them.

BUG: kernel NULL pointer dereference, address: 0000000000000012
PGD 0 P4D 0
Oops: 0000 [#1] SMP PTI
CPU: 3 PID: 2210 Comm: modprobe Not tainted
6.1.0-rc1-00171-g2159299a3b74-dirty #217
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014
RIP: 0010:kprobe_event_gen_test_exit+0x1c/0xb5 [kprobe_event_gen_test]
Code: Unable to access opcode bytes at 0xffffffff9ffffff2.
RSP: 0018:ffffc900015bfeb8 EFLAGS: 00010246
RAX: ffffffffffffffea RBX: ffffffffa0002080 RCX: 0000000000000000
RDX: ffffffffa0001054 RSI: ffffffffa0001064 RDI: ffffffffdfc6349c
RBP: ffffffffa0000000 R08: 0000000000000004 R09: 00000000001e95c0
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000800
R13: ffffffffa0002420 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f56b75be540(0000) GS:ffff88813bc00000(0000)
knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff9ffffff2 CR3: 000000010874a006 CR4: 0000000000330ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __x64_sys_delete_module+0x206/0x380
 ? lockdep_hardirqs_on_prepare+0xd8/0x190
 ? syscall_enter_from_user_mode+0x1c/0x50
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 64836248dda20c8e7427b493f7e06d9bf8f58850; < bb70fcae4115d24b7e8cee17a6da8b1943f546bb (affected, git); ≥ 64836248dda20c8e7427b493f7e06d9bf8f58850; < 3a41c0f2a5c3bf72b4c4e9dd4b1025378201e332 (affected, git); ≥ 64836248dda20c8e7427b493f7e06d9bf8f58850; < fd0efd4f7bfe611a8339ba01bc2ac3c33e79159d (affected, git); ≥ 64836248dda20c8e7427b493f7e06d9bf8f58850; < e0d75267f59d7084e0468bd68beeb1bf9c71d7c0 (affected, git). Source: CNA: Linux
- Linux / Linux: 5.6 (affected); ≥ 0; < 5.6 (unaffected, semver); ≥ 5.10.156; ≤ 5.10.* (unaffected, semver); ≥ 5.15.80; ≤ 5.15.* (unaffected, semver); ≥ 6.0.10; ≤ 6.0.* (unaffected, semver); ≥ 6.1; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.20% as of 2026-11-05; percentile 10.16%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/bb70fcae4115d24b7e8cee17a6da8b1943f546bb (CNA: Linux)

- https://git.kernel.org/stable/c/3a41c0f2a5c3bf72b4c4e9dd4b1025378201e332 (CNA: Linux)

- https://git.kernel.org/stable/c/fd0efd4f7bfe611a8339ba01bc2ac3c33e79159d (CNA: Linux)

- https://git.kernel.org/stable/c/e0d75267f59d7084e0468bd68beeb1bf9c71d7c0 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2022-49797; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2022-49797; retrieved 2026-11-05; source updated Not reported

Revision: 3fccb576ad97e09746b2678332d147158488073b5c04519ef84218d6c7d37cbe

Canonical: https://y2.dev/cve/CVE-2022-49797

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