CVE-2022-48976

Source
https://nvd.nist.gov/vuln/detail/CVE-2022-48976
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-48976.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2022-48976
Related
Published
2024-10-21T20:15:09Z
Modified
2024-10-25T18:47:40Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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

netfilter: flowtableoffload: fix using _thiscpuadd in preemptible

flowoffloadqueuework() can be called in workqueue without bh disabled, like the call trace showed in my actct testing, calling NFFLOWTABLESTATINC() there would cause a call trace:

BUG: using _thiscpuadd() in preemptible [00000000] code: kworker/u4:0/138560 caller is flowoffloadqueuework+0xec/0x1b0 [nfflowtable] Workqueue: actctworkqueue tcfctflowtablecleanupwork [actct] Call Trace: <TASK> dumpstacklvl+0x33/0x46 checkpreemptiondisabled+0xc3/0xf0 flowoffloadqueuework+0xec/0x1b0 [nfflowtable] nfflowtableiterate+0x138/0x170 [nfflowtable] nfflowtablefree+0x140/0x1a0 [nfflowtable] tcfctflowtablecleanupwork+0x2f/0x2b0 [actct] processonework+0x6a3/0x1030 workerthread+0x8a/0xdf0

This patch fixes it by using NFFLOWTABLESTATINCATOMIC() instead in flowoffloadqueuework().

Note that for FLOWCLSREPLACE branch in flowoffloadqueuework(), it may not be called in preemptible path, but it's good to use NFFLOWTABLESTATINCATOMIC() for all cases in flowoffloadqueue_work().

References

Affected packages

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.1.4-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.1.4-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}