# CVE-2022-49465: blk-throttle: Set BIO_THROTTLED when bio has been throttled

> A use-after-free vulnerability in the Linux kernel's block throttle mechanism allows local attackers to potentially execute code or escalate privileges.

- **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:** 26 Feb 2025
- **Updated:** 5 Aug 2026
- **Also known as:** AZL-58998, DEBIAN-CVE-2022-49465, GHSA-xp9j-268q-p7q6, ROOT-OS-DEBIAN-11-CVE-2022-49465, ROOT-OS-UBUNTU-2204-CVE-2022-49465, UBUNTU-CVE-2022-49465

## What is CVE-2022-49465?

CVE-2022-49465 is a high-severity use after free vulnerability in Linux kernel, published on 26 Feb 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:

blk-throttle: Set BIO_THROTTLED when bio has been throttled

1.In current process, all bio will set the BIO_THROTTLED flag
after __blk_throtl_bio().

2.If bio needs to be throttled, it will start the timer and
stop submit bio directly. Bio will submit in
blk_throtl_dispatch_work_fn() when the timer expires.But in
the current process, if bio is throttled. The BIO_THROTTLED
will be set to bio after timer start. If the bio has been
completed, it may cause use-after-free blow.

BUG: KASAN: use-after-free in blk_throtl_bio+0x12f0/0x2c70
Read of size 2 at addr ffff88801b8902d4 by task fio/26380

 dump_stack+0x9b/0xce
 print_address_description.constprop.6+0x3e/0x60
 kasan_report.cold.9+0x22/0x3a
 blk_throtl_bio+0x12f0/0x2c70
 submit_bio_checks+0x701/0x1550
 submit_bio_noacct+0x83/0xc80
 submit_bio+0xa7/0x330
 mpage_readahead+0x380/0x500
 read_pages+0x1c1/0xbf0
 page_cache_ra_unbounded+0x471/0x6f0
 do_page_cache_ra+0xda/0x110
 ondemand_readahead+0x442/0xae0
 page_cache_async_ra+0x210/0x300
 generic_file_buffered_read+0x4d9/0x2130
 generic_file_read_iter+0x315/0x490
 blkdev_read_iter+0x113/0x1b0
 aio_read+0x2ad/0x450
 io_submit_one+0xc8e/0x1d60
 __se_sys_io_submit+0x125/0x350
 do_syscall_64+0x2d/0x40
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Allocated by task 26380:
 kasan_save_stack+0x19/0x40
 __kasan_kmalloc.constprop.2+0xc1/0xd0
 kmem_cache_alloc+0x146/0x440
 mempool_alloc+0x125/0x2f0
 bio_alloc_bioset+0x353/0x590
 mpage_alloc+0x3b/0x240
 do_mpage_readpage+0xddf/0x1ef0
 mpage_readahead+0x264/0x500
 read_pages+0x1c1/0xbf0
 page_cache_ra_unbounded+0x471/0x6f0
 do_page_cache_ra+0xda/0x110
 ondemand_readahead+0x442/0xae0
 page_cache_async_ra+0x210/0x300
 generic_file_buffered_read+0x4d9/0x2130
 generic_file_read_iter+0x315/0x490
 blkdev_read_iter+0x113/0x1b0
 aio_read+0x2ad/0x450
 io_submit_one+0xc8e/0x1d60
 __se_sys_io_submit+0x125/0x350
 do_syscall_64+0x2d/0x40
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 0:
 kasan_save_stack+0x19/0x40
 kasan_set_track+0x1c/0x30
 kasan_set_free_info+0x1b/0x30
 __kasan_slab_free+0x111/0x160
 kmem_cache_free+0x94/0x460
 mempool_free+0xd6/0x320
 bio_free+0xe0/0x130
 bio_put+0xab/0xe0
 bio_endio+0x3a6/0x5d0
 blk_update_request+0x590/0x1370
 scsi_end_request+0x7d/0x400
 scsi_io_completion+0x1aa/0xe50
 scsi_softirq_done+0x11b/0x240
 blk_mq_complete_request+0xd4/0x120
 scsi_mq_done+0xf0/0x200
 virtscsi_vq_done+0xbc/0x150
 vring_interrupt+0x179/0x390
 __handle_irq_event_percpu+0xf7/0x490
 handle_irq_event_percpu+0x7b/0x160
 handle_irq_event+0xcc/0x170
 handle_edge_irq+0x215/0xb20
 common_interrupt+0x60/0x120
 asm_common_interrupt+0x1e/0x40

Fix this by move BIO_THROTTLED set into the queue_lock.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2022-49465?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2022-49465?

Apply the vendor's patch.

## Is CVE-2022-49465 being exploited?

There is no known exploitation of CVE-2022-49465 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-2022-49465 and fix it if it is affected.

What it is: CVE-2022-49465 is a high-severity use after free vulnerability in Linux kernel, published on 26 Feb 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-2022-49465 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-2022-49465/ (Markdown: https://insights.sbomify.com/CVE-2022-49465/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-49465
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-49465
- OSV: https://osv.dev/vulnerability/CVE-2022-49465

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-49465/
Summaries are generated and may contain mistakes; the official description above is the record.