bpf: Fix linked reg delta tracking when src_reg == dst_reg

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Summary

CVECVE-2026-53092
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:23 UTC
Updated2026-07-15 01:16:29 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Fix linked reg delta tracking when src_reg == dst_reg Consider the case of rX += rX where src_reg and dst_reg are pointers to the same bpf_reg_state in adjust_reg_min_max_vals(). The latter first modifies the dst_reg in-place, and later in the delta tracking, the subsequent is_reg_const(src_reg)/reg_const_value(src_reg) reads the post-{add,sub} value instead of the original source. This is problematic since it sets an incorrect delta, which sync_linked_regs() then propagates to linked registers, thus creating a verifier-vs-runtime mismatch. Fix it by just skipping this corner case.

Risk And Classification

Primary CVSS: v3.1 6.4 MEDIUM from ADP

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001250000 probability, percentile 0.025770000 (date 2026-07-16)

Problem Types: CWE-393 | CWE-393 Return of Wrong Status Code

VersionSourceTypeScoreSeverityVector
3.1ADPCVSS6.4MEDIUMCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary6.4MEDIUMCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 98d7ca374ba4b39e7535613d40e159f09ca14da2 d88e8e4a3b52bd5b2ff3eceba4b29d1b5506d066 git Not specified
CNA Linux Linux affected 98d7ca374ba4b39e7535613d40e159f09ca14da2 cc86a8b0a1c54d2bccf6f68cf49b82dea91b84de git Not specified
CNA Linux Linux affected 98d7ca374ba4b39e7535613d40e159f09ca14da2 d7f14173c0d5866c3cae759dee560ad1bed10d2e git Not specified
CNA Linux Linux affected 6.11 Not specified
CNA Linux Linux unaffected 6.11 semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified
ADP Red Hat Red Hat Enterprise Linux 10 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 9 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 9 Not specified Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d88e8e4a3b52bd5b2ff3eceba4b29d1b5506d066 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cc86a8b0a1c54d2bccf6f68cf49b82dea91b84de 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53092.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
git.kernel.org/stable/c/d7f14173c0d5866c3cae759dee560ad1bed10d2e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
access.redhat.com/security/cve/CVE-2026-53092 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
ADP2026-06-24T00:00:00.000ZReported to Red Hat.
ADP2026-06-24T00:00:00.000ZMade public.
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