bpf: Fix ld_{abs,ind} failure path analysis in subprogs

CVE	CVE-2026-53090
State	PUBLISHED
Assigner	Linux
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-06-24 17:17:23 UTC
Updated	2026-07-15 01:16:28 UTC
Description	In the Linux kernel, the following vulnerability has been resolved: bpf: Fix ld_{abs,ind} failure path analysis in subprogs Usage of ld_{abs,ind} instructions got extended into subprogs some time ago via commit 09b28d76eac4 ("bpf: Add abnormal return checks."). These are only allowed in subprograms when the latter are BTF annotated and have scalar return types. The code generator in bpf_gen_ld_abs() has an abnormal exit path (r0=0 + exit) from legacy cBPF times. While the enforcement is on scalar return types, the verifier must also simulate the path of abnormal exit if the packet data load via ld_{abs,ind} failed. This is currently not the case. Fix it by having the verifier simulate both success and failure paths, and extend it in similar ways as we do for tail calls. The success path (r0=unknown, continue to next insn) is pushed onto stack for later validation and the r0=0 and return to the caller is done on the fall-through side.

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: 0.001240000 probability, percentile 0.025350000 (date 2026-07-15)

Problem Types: CWE-253 | CWE-253 Incorrect Check of Function Return Value

Version	Source	Type	Score	Severity	Vector
3.1	ADP	CVSS	6.4	MEDIUM	`CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H`
3.1	416baaa9-dc9f-4396-8d5f-8c081fb06d67	Secondary	7.8	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
3.1	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	Secondary	6.4	MEDIUM	`CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H`
3.1	CNA	DECLARED	7.8	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`

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

Source	Vendor	Product	Version	Platforms
CNA	Linux	Linux	affected 09b28d76eac48e922dc293da1aa2b2b85c32aeee d846d83bdacbd8f14fc45c63b8c1d22608452e1c git	Not specified
CNA	Linux	Linux	affected 09b28d76eac48e922dc293da1aa2b2b85c32aeee ee861486e377edc55361c08dcbceab3f6b6577bd git	Not specified
CNA	Linux	Linux	affected 5.10	Not specified
CNA	Linux	Linux	unaffected 5.10 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

Reference	Source	Link	Tags
access.redhat.com/security/cve/CVE-2026-53090	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
bugzilla.redhat.com/show_bug.cgi	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	bugzilla.redhat.com
git.kernel.org/stable/c/ee861486e377edc55361c08dcbceab3f6b6577bd	416baaa9-dc9f-4396-8d5f-8c081fb06d67	git.kernel.org
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53090.json	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	security.access.redhat.com
git.kernel.org/stable/c/d846d83bdacbd8f14fc45c63b8c1d22608452e1c	416baaa9-dc9f-4396-8d5f-8c081fb06d67	git.kernel.org
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

Source	Time	Event
ADP	2026-06-24T00:00:00.000Z	Reported to Red Hat.
ADP	2026-06-24T00:00:00.000Z	Made public.

There are currently no legacy QID mappings associated with this CVE.