Bug 2530648

Summary: CVE-2026-18238 libpcap: libpcap: Information disclosure via out-of-bounds read in rpcap client [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": ["25245e68-97b1-4f8c-a875-06fa1dc8db4c"]}
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 01:06:45 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: 2529090    

Description gkamathe 2026-09-09 09:46:45 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.

The rpcap client code that processes a RPCAP_MSG_PACKET message received from the server incorrectly validates its headers.  A malicious server can send a crafted message and cause the client to treat up to 20 bytes of the client process memory beyond the end of the buffer as if it was a part of the captured packet.

Comment 1 Fedora Update System 2026-09-10 09:02:00 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 09:02:20 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 01:35:04 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 02:07:47 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 02:27:49 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 01:06:45 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 00:17:04 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 01:29:36 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.