Bug 2530658

Summary:	CVE-2026-6554 libpcap: libpcap: Denial of Service via infinite loop in BPF interpreter [fedora-all]
Product:	[Fedora] Fedora	Reporter:	gkamathe
Component:	libpcap	Assignee:	Michal Ruprich <mruprich>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	fhrdina, luhliari, mruprich, msekleta, thozza
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["4c571c41-64fa-4406-9b61-3c4c51fc37e4"]}
Fixed In Version:	libpcap-1.10.7-1.fc44 libpcap-1.10.7-1.fc45	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-09-12 01:06:51 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2529091

Description gkamathe 2026-09-09 09:57:43 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations.  In particular uncommon use cases a crafted filter program can cause the interpreter to loop infinitely.

Comment 1 Fedora Update System 2026-09-10 09:02:02 UTC

FEDORA-2026-4401b94ad0 (libpcap-1.10.7-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-4401b94ad0

Comment 2 Fedora Update System 2026-09-10 09:02:23 UTC

FEDORA-2026-c3fb234b87 (libpcap-1.10.7-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-c3fb234b87

Comment 3 Fedora Update System 2026-09-11 01:35:06 UTC

FEDORA-2026-c3fb234b87 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-c3fb234b87`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-c3fb234b87

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-09-11 02:07:50 UTC

FEDORA-2026-4401b94ad0 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-4401b94ad0`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-4401b94ad0

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-09-11 02:27:51 UTC

FEDORA-2026-395bd81c94 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-395bd81c94`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-395bd81c94

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-09-12 01:06:51 UTC

FEDORA-2026-395bd81c94 (libpcap-1.10.7-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 7 Fedora Update System 2026-09-13 00:17:06 UTC

FEDORA-2026-c3fb234b87 (libpcap-1.10.7-1.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.