Bug 2541305 (CVE-2026-98029)

Summary: CVE-2026-98029 kernel: eth: nfp: bound the ntuple rule dump by the caller's buffer size
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Netronome Flow Processor (NFP) network driver. The driver fails to validate the user-provided buffer size when retrieving network flow steering rules. An unprivileged local user can exploit this vulnerability to trigger an out-of-bounds memory write or a null pointer dereference, potentially leading to memory corruption and a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-09-25 11:17:20 UTC 
In the Linux kernel, the following vulnerability has been resolved:

eth: nfp: bound the ntuple rule dump by the caller's buffer size

nfp_net_get_fs_loc() dumps every entry of nn->fs.list into rule_locs[]
without consulting cmd->rule_cnt, which is how many entries the caller
had room for.  ETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN and the
ioctl sizes the buffer from the rule_cnt userspace passes in, so once an
admin has installed flow steering rules any user can ask for fewer slots
than there are rules and run off the end of the allocation.  A rule_cnt
of 0 leaves the buffer pointer NULL and the walk dereferences it.

Bail out with -EMSGSIZE when the buffer fills up, the way the other
ntuple capable drivers do, and report how many locations were filled so
a shrinking rule list does not leave the caller reading stale slots.
Comment 1 Keith Grant 2026-09-28 21:41:18 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98029.mbox