Bug 2563073

Summary:	CVE-2026-115455 gcc: Stack overflow in std::bitset on libstdc++ [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Marco Benatto <mbenatto>
Component:	gcc	Assignee:	Jakub Jelinek <jakub>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	dmalcolm, fweimer, jakub, jlaw, josmyers, jwakely, mcermak, mpolacek, msebor, nickc, nixuser, sipoyare
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["cae45a16-e4cd-4afa-b5dc-473cdaaf649b"]}
Fixed In Version:	gcc-16.2.1-3.fc45 gcc-16.2.1-3.fc44	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-10-31 18:53:52 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:	2562933

Description Marco Benatto 2026-10-28 17:52:43 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.

There's a Stack corruption in std::bitset stream extraction in libstdc++. The __builtin_alloca argument didn't account for the size or alignment of wide characters resulting in a stack buffer overflow.

Comment 1 Fedora Update System 2026-10-30 23:25:52 UTC

FEDORA-2026-589138efb1 (gcc-16.2.1-3.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-589138efb1

Comment 2 Fedora Update System 2026-10-30 23:28:18 UTC

FEDORA-2026-d732fb97a0 (gcc-16.2.1-3.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-d732fb97a0

Comment 3 Fedora Update System 2026-10-31 03:04:14 UTC

FEDORA-2026-d732fb97a0 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-d732fb97a0`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-d732fb97a0

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

Comment 4 Fedora Update System 2026-10-31 05:14:37 UTC

FEDORA-2026-589138efb1 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-2026-589138efb1`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-589138efb1

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

Comment 5 Fedora Update System 2026-10-31 18:53:52 UTC

FEDORA-2026-589138efb1 (gcc-16.2.1-3.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 6 Fedora Update System 2026-11-01 03:36:30 UTC

FEDORA-2026-d732fb97a0 (gcc-16.2.1-3.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.