🛡️ CVE-2022-49826 — kernel

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

Description

ata: libata-transport: fix double ata_host_put() in ata_tport_add()

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

ata: libata-transport: fix double ata_host_put() in ata_tport_add()

In the error path in ata_tport_add(), when calling put_device(),

ata_tport_release() is called, it will put the refcount of 'ap->host'.

And then ata_host_put() is called again, the refcount is decreased

to 0, ata_host_release() is called, all ports are freed and set to

null.

When unbinding the device after failure, ata_host_stop() is called

to release the resources, it leads a null-ptr-deref(), because all

the ports all freed and null.

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008

CPU: 7 PID: 18671 Comm: modprobe Kdump: loaded Tainted: G E 6.1.0-rc3+ #8

pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)

pc : ata_host_stop+0x3c/0x84 [libata]

lr : release_nodes+0x64/0xd0

Call trace:

ata_host_stop+0x3c/0x84 [libata]

release_nodes+0x64/0xd0

devres_release_all+0xbc/0x1b0

device_unbind_cleanup+0x20/0x70

really_probe+0x158/0x320

__driver_probe_device+0x84/0x120

driver_probe_device+0x44/0x120

__driver_attach+0xb4/0x220

bus_for_each_dev+0x78/0xdc

driver_attach+0x2c/0x40

bus_add_driver+0x184/0x240

driver_register+0x80/0x13c

__pci_register_driver+0x4c/0x60

ahci_pci_driver_init+0x30/0x1000 [ahci]

Fix this by removing redundant ata_host_put() in the error path.

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.

Affected software

CVE-2022-49826 is recorded against 2 packages.

  • kernel (from 5.16.0 up to 6.0.10)
  • linux-kernel

Timeline and source

Published on 1 May 2025 and last revised on 6 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)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2022-49826 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 2025-05-01
Updated 2026-08-12
Modified 2026-08-06

Affected Packages

Software From version Fixed in
kernel 5.16.0 6.0.10
linux-kernel — —

Similar Threats

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