CVE-2022-50219

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Source
https://nvd.nist.gov/vuln/detail/CVE-2022-50219
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-50219.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2022-50219
Downstream
Published
2025-06-18T11:15:52Z
Modified
2025-07-01T14:24:44.711718Z
Summary
[none]
Details

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

bpf: Fix KASAN use-after-free Read in computeeffectiveprogs

Syzbot found a Use After Free bug in computeeffectiveprogs(). The reproducer creates a number of BPF links, and causes a fault injected alloc to fail, while calling bpflinkdetach on them. Link detach triggers the link to be freed by bpflinkfree(), which calls _cgroupbpfdetach() and updateeffectiveprogs(). If the memory allocation in this function fails, the function restores the pointer to the bpfcgrouplink on the cgroup list, but the memory gets freed just after it returns. After this, every subsequent call to updateeffectiveprogs() causes this already deallocated pointer to be dereferenced in proglist_length(), and triggers KASAN UAF error.

To fix this issue don't preserve the pointer to the prog or link in the list, but remove it and replace it with a dummy prog without shrinking the table. The subsequent call to _cgroupbpfdetach() or _cgroupbpfdetach() will correct it.

References

Affected packages

Debian:11 / 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
5.10.140-1

Affected versions

5.*

5.10.46-4
5.10.46-5
5.10.70-1~bpo10+1
5.10.70-1
5.10.84-1
5.10.92-1~bpo10+1
5.10.92-1
5.10.92-2
5.10.103-1~bpo10+1
5.10.103-1
5.10.106-1
5.10.113-1
5.10.120-1~bpo10+1
5.10.120-1
5.10.127-1
5.10.127-2~bpo10+1
5.10.127-2
5.10.136-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

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
6.0.2-1

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
6.0.2-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}