# CVE-2024-56765: powerpc/pseries/vas: Add close() callback in vas_vm_ops struct

> A use-after-free vulnerability in the Linux kernel's PowerPC VAS driver allows attackers to cause a system crash or potentially execute code during migration.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:** 6 Jan 2025
- **Updated:** 5 Aug 2026
- **Also known as:** BELL-CVE-2024-56765, DEBIAN-CVE-2024-56765, GHSA-f6j3-h537-397p, UBUNTU-CVE-2024-56765

## What is CVE-2024-56765?

CVE-2024-56765 is a high-severity use after free vulnerability in Linux kernel, published on 6 Jan 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:

powerpc/pseries/vas: Add close() callback in vas_vm_ops struct

The mapping VMA address is saved in VAS window struct when the
paste address is mapped. This VMA address is used during migration
to unmap the paste address if the window is active. The paste
address mapping will be removed when the window is closed or with
the munmap(). But the VMA address in the VAS window is not updated
with munmap() which is causing invalid access during migration.

The KASAN report shows:
[16386.254991] BUG: KASAN: slab-use-after-free in reconfig_close_windows+0x1a0/0x4e8
[16386.255043] Read of size 8 at addr c00000014a819670 by task drmgr/696928

[16386.255096] CPU: 29 UID: 0 PID: 696928 Comm: drmgr Kdump: loaded Tainted: G    B              6.11.0-rc5-nxgzip #2
[16386.255128] Tainted: [B]=BAD_PAGE
[16386.255148] Hardware name: IBM,9080-HEX Power11 (architected) 0x820200 0xf000007 of:IBM,FW1110.00 (NH1110_016) hv:phyp pSeries
[16386.255181] Call Trace:
[16386.255202] [c00000016b297660] [c0000000018ad0ac] dump_stack_lvl+0x84/0xe8 (unreliable)
[16386.255246] [c00000016b297690] [c0000000006e8a90] print_report+0x19c/0x764
[16386.255285] [c00000016b297760] [c0000000006e9490] kasan_report+0x128/0x1f8
[16386.255309] [c00000016b297880] [c0000000006eb5c8] __asan_load8+0xac/0xe0
[16386.255326] [c00000016b2978a0] [c00000000013f898] reconfig_close_windows+0x1a0/0x4e8
[16386.255343] [c00000016b297990] [c000000000140e58] vas_migration_handler+0x3a4/0x3fc
[16386.255368] [c00000016b297a90] [c000000000128848] pseries_migrate_partition+0x4c/0x4c4
...

[16386.256136] Allocated by task 696554 on cpu 31 at 16377.277618s:
[16386.256149]  kasan_save_stack+0x34/0x68
[16386.256163]  kasan_save_track+0x34/0x80
[16386.256175]  kasan_save_alloc_info+0x58/0x74
[16386.256196]  __kasan_slab_alloc+0xb8/0xdc
[16386.256209]  kmem_cache_alloc_noprof+0x200/0x3d0
[16386.256225]  vm_area_alloc+0x44/0x150
[16386.256245]  mmap_region+0x214/0x10c4
[16386.256265]  do_mmap+0x5fc/0x750
[16386.256277]  vm_mmap_pgoff+0x14c/0x24c
[16386.256292]  ksys_mmap_pgoff+0x20c/0x348
[16386.256303]  sys_mmap+0xd0/0x160
...

[16386.256350] Freed by task 0 on cpu 31 at 16386.204848s:
[16386.256363]  kasan_save_stack+0x34/0x68
[16386.256374]  kasan_save_track+0x34/0x80
[16386.256384]  kasan_save_free_info+0x64/0x10c
[16386.256396]  __kasan_slab_free+0x120/0x204
[16386.256415]  kmem_cache_free+0x128/0x450
[16386.256428]  vm_area_free_rcu_cb+0xa8/0xd8
[16386.256441]  rcu_do_batch+0x2c8/0xcf0
[16386.256458]  rcu_core+0x378/0x3c4
[16386.256473]  handle_softirqs+0x20c/0x60c
[16386.256495]  do_softirq_own_stack+0x6c/0x88
[16386.256509]  do_softirq_own_stack+0x58/0x88
[16386.256521]  __irq_exit_rcu+0x1a4/0x20c
[16386.256533]  irq_exit+0x20/0x38
[16386.256544]  interrupt_async_exit_prepare.constprop.0+0x18/0x2c
...

[16386.256717] Last potentially related work creation:
[16386.256729]  kasan_save_stack+0x34/0x68
[16386.256741]  __kasan_record_aux_stack+0xcc/0x12c
[16386.256753]  __call_rcu_common.constprop.0+0x94/0xd04
[16386.256766]  vm_area_free+0x28/0x3c
[16386.256778]  remove_vma+0xf4/0x114
[16386.256797]  do_vmi_align_munmap.constprop.0+0x684/0x870
[16386.256811]  __vm_munmap+0xe0/0x1f8
[16386.256821]  sys_munmap+0x54/0x6c
[16386.256830]  system_call_exception+0x1a0/0x4a0
[16386.256841]  system_call_vectored_common+0x15c/0x2ec

[16386.256868] The buggy address belongs to the object at c00000014a819670
                which belongs to the cache vm_area_struct of size 168
[16386.256887] The buggy address is located 0 bytes inside of
                freed 168-byte region [c00000014a819670, c00000014a819718)

[16386.256915] The buggy address belongs to the physical page:
[16386.256928] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14a81
[16386.256950] memcg:c0000000ba430001
[16386.256961] anon flags: 0x43ffff800000000(node=4|zone=0|lastcpupid=0x7ffff)
[16386.256975] page_type: 0xfdffffff(slab)
[16386
---truncated---

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2024-56765?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2024-56765?

Apply the vendor's patch.

## Is CVE-2024-56765 being exploited?

There is no known exploitation of CVE-2024-56765 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-2024-56765 and fix it if it is affected.

What it is: CVE-2024-56765 is a high-severity use after free vulnerability in Linux kernel, published on 6 Jan 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-2024-56765 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-2024-56765/ (Markdown: https://insights.sbomify.com/CVE-2024-56765/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-56765
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-56765
- OSV: https://osv.dev/vulnerability/CVE-2024-56765

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-56765/
Summaries are generated and may contain mistakes; the official description above is the record.