Vulnerability-Lookup

CVE-2026-53090 (GCVE-0-2026-53090)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-30 03:21

Title

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

Summary

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.

Severity

7.8 (High)


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

7 (High)


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

CWE

CWE-253 - Incorrect Check of Function Return Value

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/d846d83bdacbd8f14…
https://git.kernel.org/stable/c/ee861486e377edc55…
https://access.redhat.com/security/cve/CVE-2026-53090	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2492305	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex

Impacted products

7 products

Vendor	Product	Version
Linux	Linux	Affected: 09b28d76eac48e922dc293da1aa2b2b85c32aeee , < d846d83bdacbd8f14fc45c63b8c1d22608452e1c (git) Affected: 09b28d76eac48e922dc293da1aa2b2b85c32aeee , < ee861486e377edc55361c08dcbceab3f6b6577bd (git)
Linux	Linux	Affected: 5.10 Unaffected: 0 , < 5.10 (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7

Show details on NVD website

JSON

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}

GHSA-H443-HX93-M7QC

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-30 03:37

Details

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.

Severity

7.8 (High)


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

Show details on source website

JSON

To clipboard

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  "aliases": [
    "CVE-2026-53090"
  ],
  "database_specific": {
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      "CWE-253"
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    "github_reviewed": false,
    "github_reviewed_at": null,
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    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix ld_{abs,ind} failure path analysis in subprogs\n\nUsage of ld_{abs,ind} instructions got extended into subprogs some time\nago via commit 09b28d76eac4 (\"bpf: Add abnormal return checks.\"). These\nare only allowed in subprograms when the latter are BTF annotated and\nhave scalar return types.\n\nThe code generator in bpf_gen_ld_abs() has an abnormal exit path (r0=0 +\nexit) from legacy cBPF times. While the enforcement is on scalar return\ntypes, the verifier must also simulate the path of abnormal exit if the\npacket data load via ld_{abs,ind} failed.\n\nThis is currently not the case. Fix it by having the verifier simulate\nboth success and failure paths, and extend it in similar ways as we do\nfor tail calls. The success path (r0=unknown, continue to next insn) is\npushed onto stack for later validation and the r0=0 and return to the\ncaller is done on the fall-through side.",
  "id": "GHSA-h443-hx93-m7qc",
  "modified": "2026-06-30T03:37:13Z",
  "published": "2026-06-24T18:32:46Z",
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53090"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-53090"
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      "type": "CVSS_V3"
    }
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-53090 (GCVE-0-2026-53090)

GHSA-H443-HX93-M7QC

Tags

Sightings

Nomenclature