DEBIAN-CVE-2024-26737

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Source
https://security-tracker.debian.org/tracker/CVE-2024-26737
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-26737.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2024-26737
Upstream
Published
2024-04-03T17:15:51Z
Modified
2025-09-19T07:35:01.203233Z
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix racing between bpftimercancelandfree and bpftimercancel The following race is possible between bpftimercancelandfree and bpftimercancel. It will lead a UAF on the timer->timer. bpftimercancel(); spinlock(); t = timer->time; spinunlock(); bpftimercancelandfree(); spinlock(); t = timer->timer; timer->timer = NULL; spinunlock(); hrtimercancel(&t->timer); kfree(t); /* UAF on t */ hrtimercancel(&t->timer); In bpftimercancelandfree, this patch frees the timer->timer after a rcu grace period. This requires a rcuhead addition to the "struct bpfhrtimer". Another kfree(t) happens in bpftimerinit, this does not need a kfreercu because it is still under the spinlock and timer->timer has not been visible by others yet. In bpftimercancel, rcureadlock() is added because this helper can be used in a non rcu critical section context (e.g. from a sleepable bpf prog). Other timer->timer usages in helpers.c have been audited, bpftimercancel() is the only place where timer->timer is used outside of the spinlock. Another solution considered is to mark a t->flag in bpftimercancel and clear it after hrtimercancel() is done. In bpftimercancelandfree, it busy waits for the flag to be cleared before kfree(t). This patch goes with a straight forward solution and frees timer->timer after a rcu grace period.

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
6.1.82-1

Affected versions

6.*

6.1.27-1
6.1.37-1
6.1.38-1
6.1.38-2~bpo11+1
6.1.38-2
6.1.38-3
6.1.38-4~bpo11+1
6.1.38-4
6.1.52-1
6.1.55-1~bpo11+1
6.1.55-1
6.1.64-1
6.1.66-1
6.1.67-1
6.1.69-1~bpo11+1
6.1.69-1
6.1.76-1~bpo11+1
6.1.76-1

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
6.7.7-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:14 / 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
6.7.7-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}