CVE-2026-98599 (GCVE-0-2026-98599)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:19 – Updated: 2026-10-19 09:22
VLAI
Title
bpf: Reject non-negative offsets in stack_slot_obj_get_spi()
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject non-negative offsets in stack_slot_obj_get_spi() bpf_get_spi() computes (-off - 1) / BPF_REG_SIZE using C division, which truncates toward zero. For off == 0, this produces spi 0, the same index used by the valid stack slot at fp-8. stack_slot_obj_get_spi() currently checks alignment and the resulting spi bounds, but does not reject the non-negative offset itself. It can therefore validate a PTR_TO_STACK register holding fp+0 against an iterator stored at fp-8 even though the runtime receives the actual fp+0 pointer. An effectful iterator kfunc can then interpret memory outside the BPF stack as iterator state. Reject non-negative offsets before converting the offset to an spi. All valid stack objects begin at a negative offset from the frame pointer.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6643 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 06accc8779c1d558a5b5a21f2ac82b0c95827ddd , < 89a7241fc7ecc1b5e47c3f071081e314523b8d9d (git)
Affected: 06accc8779c1d558a5b5a21f2ac82b0c95827ddd , < 79a9172f3ab4ad8392c5e5c8944b9b7710ade620 (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98599",
    "datePublished": "2026-10-18T15:19:11.941Z",
    "dateReserved": "2026-09-25T10:25:14.359Z",
    "dateUpdated": "2026-10-19T09:22:25.359Z",
    "state": "PUBLISHED"
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          }
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        "metrics": {},
        "published": "2026-10-18T16:17:12.603",
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98599.json",
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}



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