Bug 2567288

Summary:	CVE-2026-121944 sngrep: sngrep: Denial of Service via crafted packet capture file [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Marian Rehak <mrehak>
Component:	sngrep	Assignee:	Peter Lemenkov <lemenkov>
Status:	ON_QA ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	lemenkov
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["c76cbb1a-dde4-4977-9bf9-290067625874"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:		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:	2566873

Description Marian Rehak 2026-11-05 13:05:24 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.

sngrep through 1.9.0 contains an infinite loop vulnerability in capture_packet_reasm_ip() in src/capture.c that allows attackers to cause denial of service via crafted NFLOG TLVs. Attackers can supply a pcap file with link type NFLOG containing a non-payload TLV with length under 4, making the capture thread spin at full CPU and stop processing packets.

Comment 1 Fedora Update System 2026-11-05 16:20:49 UTC

FEDORA-2026-39f14c4384 (sngrep-1.9.0-4.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-39f14c4384

Comment 2 Fedora Update System 2026-11-05 16:20:53 UTC

FEDORA-2026-1e72c25706 (sngrep-1.9.0-4.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-1e72c25706

Comment 3 Fedora Update System 2026-11-05 16:20:56 UTC

FEDORA-2026-f194aee07b (sngrep-1.9.0-4.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-f194aee07b

Comment 4 Fedora Update System 2026-11-06 03:13:07 UTC

FEDORA-2026-1e72c25706 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-2026-1e72c25706`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-1e72c25706

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

Comment 5 Fedora Update System 2026-11-06 03:33:32 UTC

FEDORA-2026-f194aee07b 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-f194aee07b`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-f194aee07b

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

Comment 6 Fedora Update System 2026-11-06 18:17:44 UTC

FEDORA-2026-39f14c4384 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-2026-39f14c4384`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-39f14c4384

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