Bug 2530707

Summary: CVE-2026-18313 libpcap: libpcap: Denial of Service via memory leak in rpcapd [fedora-all]
Product: [Fedora] Fedora Reporter: gkamathe
Component: libpcapAssignee: Michal Ruprich <mruprich>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: fhrdina, luhliari, mruprich, msekleta, thozza
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["7dff6ec3-433c-46bb-a319-0b0db15978f6"]}
Fixed In Version: libpcap-1.10.7-1.fc44 libpcap-1.10.7-1.fc45 libpcap-1.10.7-1.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-09-12 01:06:55 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: 2529092    

Description gkamathe 2026-09-09 10:42:37 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.

rpcapd can allocate up to 65536 bytes per each RPCAP_MSG_UPDATEFILTER_REQ or RPCAP_MSG_STARTCAP_REQ message received from the client, but it never frees the memory, so it leaks memory even under normal use.  A malicious client can cause the server to leak memory substantially faster.

Comment 1 Fedora Update System 2026-09-10 09:02:06 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 09:02:27 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 01:35:09 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 02:07:52 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 02:27:53 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 01:06:55 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 00:17:08 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.

Comment 8 Fedora Update System 2026-09-26 01:29:41 UTC
FEDORA-2026-4401b94ad0 (libpcap-1.10.7-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.