CVE-2022-49511

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Source
https://nvd.nist.gov/vuln/detail/CVE-2022-49511
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49511.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2022-49511
Downstream
Related
Published
2025-02-26T02:13:41Z
Modified
2025-10-21T10:17:16.505135Z
Summary
fbdev: defio: fix the pagelist corruption
Details

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

fbdev: defio: fix the pagelist corruption

Easily hit the below list corruption:

listadd corruption. prev->next should be next (ffffffffc0ceb090), but was ffffec604507edc8. (prev=ffffec604507edc8). WARNING: CPU: 65 PID: 3959 at lib/listdebug.c:26 listaddvalid+0x53/0x80 CPU: 65 PID: 3959 Comm: fbdev Tainted: G U RIP: 0010:listaddvalid+0x53/0x80 Call Trace: <TASK> fbdeferrediomkwrite+0xea/0x150 dopagemkwrite+0x57/0xc0 dowppage+0x278/0x2f0 _handlemmfault+0xdc2/0x1590 handlemmfault+0xdd/0x2c0 douseraddrfault+0x1d3/0x650 excpagefault+0x77/0x180 ? asmexcpagefault+0x8/0x30 asmexcpage_fault+0x1e/0x30

RIP: 0033:0x7fd98fc8fad1

Figure out the race happens when one process is adding &page->lru into the pagelist tail in fbdeferrediomkwrite(), another process is re-initializing the same &page->lru in fbdeferrediofault(), which is not protected by the lock.

This fix is to init all the page lists one time during initialization, it not only fixes the list corruption, but also avoids INITLISTHEAD() redundantly.

V2: change "int i" to "unsigned int i" (Geert Uytterhoeven)

References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
5d3aff76a3165087b0f897c0d677dfa987d9875d
Fixed
e79b2b2aadeffe1db54a6b569b9b621575c3eb07
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
105a940416fc622406653b6fe54732897642dfbc
Fixed
6a9ae2fe887042f76fd3d334349e64e8ab3c55a2
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
105a940416fc622406653b6fe54732897642dfbc
Fixed
856082f021a28221db2c32bd0531614a8382be67

Affected versions

v5.*

v5.17
v5.17-rc3
v5.17-rc4
v5.17-rc5
v5.17-rc6
v5.17-rc7
v5.17-rc8
v5.18
v5.18-rc1
v5.18-rc2
v5.18-rc3
v5.18-rc4
v5.18-rc5
v5.18-rc6
v5.18-rc7
v5.18.1
v5.18.2

Database specific

vanir_signatures

[
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        "id": "CVE-2022-49511-03123817",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@e79b2b2aadeffe1db54a6b569b9b621575c3eb07",
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
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        "target": {
            "file": "drivers/video/fbdev/core/fb_defio.c"
        }
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    {
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    {
        "id": "CVE-2022-49511-671af238",
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    {
        "id": "CVE-2022-49511-c2c43b63",
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    },
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    },
    {
        "id": "CVE-2022-49511-f9922cdf",
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    }
]

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.18.0
Fixed
5.18.3