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🛡️ CVE-2022-49720 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

block: Fix handling of offline queues in blk_mq_alloc_request_hctx()

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

block: Fix handling of offline queues in blk_mq_alloc_request_hctx()

This patch prevents that test nvme/004 triggers the following:

UBSAN: array-index-out-of-bounds in block/blk-mq.h:135:9

index 512 is out of range for type 'long unsigned int [512]'

Call Trace:

show_stack+0x52/0x58

dump_stack_lvl+0x49/0x5e

dump_stack+0x10/0x12

ubsan_epilogue+0x9/0x3b

__ubsan_handle_out_of_bounds.cold+0x44/0x49

blk_mq_alloc_request_hctx+0x304/0x310

__nvme_submit_sync_cmd+0x70/0x200 [nvme_core]

nvmf_connect_io_queue+0x23e/0x2a0 [nvme_fabrics]

nvme_loop_connect_io_queues+0x8d/0xb0 [nvme_loop]

nvme_loop_create_ctrl+0x58e/0x7d0 [nvme_loop]

nvmf_create_ctrl+0x1d7/0x4d0 [nvme_fabrics]

nvmf_dev_write+0xae/0x111 [nvme_fabrics]

vfs_write+0x144/0x560

ksys_write+0xb7/0x140

__x64_sys_write+0x42/0x50

do_syscall_64+0x35/0x80

entry_SYSCALL_64_after_hwframe+0x44/0xae

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2022-49720 is recorded against 2 packages.

  • kernel (from 5.16.0 up to 5.18.6)
  • linux-kernel

Timeline and source

Published on 26 February 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2022-49720 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-02-26
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 5.16.0 5.18.6
linux-kernel — —

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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