Bug 2529858 (CVE-2026-86849)

Summary:	CVE-2026-86849 dpdk: dpdk: Integer overflow combined with missing validation leads to host buffer overflow in vhost-crypto
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	akhatavk, aos-team-art-private, asdas, dpaolell, echaudro, eglynn, fleitner, jdelft, jjoyce, jpretori, jschluet, jupierce, ktraynor, lgarciaa, lhh, mbiarnes, mburns, mgarciac, ppalepu, ppostler, prdhamdh, rhel-process-autobot, rkhan, security-response-team, sfaye, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in DPDK lib/vhost vhost-crypto. Integer overflow in chain length checks, and missing length checks on the RSA path, can overflow a host buffer in the vhost-crypto backend.	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:	2552445, 2552446
Bug Blocks:
Deadline:	2026-12-08

Description OSIDB Bzimport 2026-09-08 14:59:06 UTC

A flaw was found in DPDK lib/vhost vhost-crypto. vhost_crypto_check_chain_request() adds uint32_t length fields without overflow checks, so a wrapped sum can pass the cap while prepare_write_back_data() still uses the original dst_data_len. write_back_data() then memcpy/memset that length from a host mbuf. The RSA request path has no equivalent length cap.