# CVE-2024-58088: bpf: Fix deadlock when freeing cgroup storage

> A deadlock in the Linux kernel BPF cgroup storage freeing path allows local attackers to cause a system hang or denial of service.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 12 Mar 2025
- **Updated:** 11 May 2026
- **Also known as:** AZL-58562, BELL-CVE-2024-58088, DEBIAN-CVE-2024-58088, GHSA-x4w2-gh57-r677, ROOT-OS-UBUNTU-2404-CVE-2024-58088, UBUNTU-CVE-2024-58088

## What is CVE-2024-58088?

CVE-2024-58088 is a medium-severity vulnerability in Linux kernel, published on 12 Mar 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

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

bpf: Fix deadlock when freeing cgroup storage

The following commit
bc235cdb423a ("bpf: Prevent deadlock from recursive bpf_task_storage_[get|delete]")
first introduced deadlock prevention for fentry/fexit programs attaching
on bpf_task_storage helpers. That commit also employed the logic in map
free path in its v6 version.

Later bpf_cgrp_storage was first introduced in
c4bcfb38a95e ("bpf: Implement cgroup storage available to non-cgroup-attached bpf progs")
which faces the same issue as bpf_task_storage, instead of its busy
counter, NULL was passed to bpf_local_storage_map_free() which opened
a window to cause deadlock:

	<TASK>
		(acquiring local_storage->lock)
	_raw_spin_lock_irqsave+0x3d/0x50
	bpf_local_storage_update+0xd1/0x460
	bpf_cgrp_storage_get+0x109/0x130
	bpf_prog_a4d4a370ba857314_cgrp_ptr+0x139/0x170
	? __bpf_prog_enter_recur+0x16/0x80
	bpf_trampoline_6442485186+0x43/0xa4
	cgroup_storage_ptr+0x9/0x20
		(holding local_storage->lock)
	bpf_selem_unlink_storage_nolock.constprop.0+0x135/0x160
	bpf_selem_unlink_storage+0x6f/0x110
	bpf_local_storage_map_free+0xa2/0x110
	bpf_map_free_deferred+0x5b/0x90
	process_one_work+0x17c/0x390
	worker_thread+0x251/0x360
	kthread+0xd2/0x100
	ret_from_fork+0x34/0x50
	ret_from_fork_asm+0x1a/0x30
	</TASK>

Progs:
 - A: SEC("fentry/cgroup_storage_ptr")
   - cgid (BPF_MAP_TYPE_HASH)
	Record the id of the cgroup the current task belonging
	to in this hash map, using the address of the cgroup
	as the map key.
   - cgrpa (BPF_MAP_TYPE_CGRP_STORAGE)
	If current task is a kworker, lookup the above hash
	map using function parameter @owner as the key to get
	its corresponding cgroup id which is then used to get
	a trusted pointer to the cgroup through
	bpf_cgroup_from_id(). This trusted pointer can then
	be passed to bpf_cgrp_storage_get() to finally trigger
	the deadlock issue.
 - B: SEC("tp_btf/sys_enter")
   - cgrpb (BPF_MAP_TYPE_CGRP_STORAGE)
	The only purpose of this prog is to fill Prog A's
	hash map by calling bpf_cgrp_storage_get() for as
	many userspace tasks as possible.

Steps to reproduce:
 - Run A;
 - while (true) { Run B; Destroy B; }

Fix this issue by passing its busy counter to the free procedure so
it can be properly incremented before storage/smap locking.

Weakness: CWE-667 (Improper Locking)

## Which versions are affected by CVE-2024-58088?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2024-58088?

Apply the vendor's patch.

## Is CVE-2024-58088 being exploited?

There is no known exploitation of CVE-2024-58088 in the wild and no public exploit code.

## Other vulnerabilities in Linux kernel

- [CVE-2026-53266](https://insights.sbomify.com/CVE-2026-53266/): Linux Kernel Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2013-6282](https://insights.sbomify.com/CVE-2013-6282/): Linux Kernel Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2022-0185](https://insights.sbomify.com/CVE-2022-0185/): Linux Kernel Heap-Based Buffer Overflow (high 8.4, exploited in the wild)
- [CVE-2013-2094](https://insights.sbomify.com/CVE-2013-2094/): Linux Kernel Privilege Escalation (high 8.4, exploited in the wild)
- [CVE-2026-53362](https://insights.sbomify.com/CVE-2026-53362/): Linux Kernel Unspecified (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-58088 and fix it if it is affected.

What it is: CVE-2024-58088 is a medium-severity vulnerability in Linux kernel, published on 12 Mar 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-58088 in the wild and no public exploit code.

Affected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-58088/ (Markdown: https://insights.sbomify.com/CVE-2024-58088/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-58088
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-58088
- OSV: https://osv.dev/vulnerability/CVE-2024-58088

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-58088/
Summaries are generated and may contain mistakes; the official description above is the record.