{"id":"CVE-2026-53110","title":"s390/bpf: Zero-extend bpf prog return values and kfunc arguments","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/bpf: Zero-extend bpf prog return values and kfunc arguments\n\ns390x ABI requires callers to zero-extend unsigned arguments and\nsign-extend signed arguments, and cal…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 528eb2cb87bc1353235a6384696b4849bde8b0ba < edc90a12073b9a530064a99945c183dde120cb99","Linux >= 528eb2cb87bc1353235a6384696b4849bde8b0ba < 44c4f999b03f55debb1a0c5ab5c1796895a1adf8","Linux >= 528eb2cb87bc1353235a6384696b4849bde8b0ba < 366b0e05ee24f5ba62bdc7ec1346038258b9a797","Linux >= 528eb2cb87bc1353235a6384696b4849bde8b0ba < 834918a77be51419383bf1dda9f02b81ecf26b34","Linux >= 528eb2cb87bc1353235a6384696b4849bde8b0ba < 202e42e4aa890172366354b233c42c73107a3f59","Linux 6.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:25:44.899680Z"},"published":"2026-06-24","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:31:33.021Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53110","references":[{"url":"https://git.kernel.org/stable/c/edc90a12073b9a530064a99945c183dde120cb99"},{"url":"https://git.kernel.org/stable/c/44c4f999b03f55debb1a0c5ab5c1796895a1adf8"},{"url":"https://git.kernel.org/stable/c/366b0e05ee24f5ba62bdc7ec1346038258b9a797"},{"url":"https://git.kernel.org/stable/c/834918a77be51419383bf1dda9f02b81ecf26b34"},{"url":"https://git.kernel.org/stable/c/202e42e4aa890172366354b233c42c73107a3f59"}],"tags":["cve.org"],"epss":0.0012,"epssPercentile":0.01677,"ingestedAt":"2026-10-16T17:24:46.732Z","slug":"CVE-2026-53110","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ns390/bpf: Zero-extend bpf prog return values and kfunc arguments\n\ns390x ABI requires callers to zero-extend unsigned arguments and\nsign-extend signed arguments, and callees to zero-extend unsigned\nreturn values and sign-extend signed return values.\n\ns390 BPF JIT currently implements only sign extension. Fix this\nomission and implement zero extension too.\n\n## Affected\n\n- `Linux >= 528eb2cb87bc1353235a6384696b4849bde8b0ba < edc90a12073b9a530064a99945c183dde120cb99`\n- `Linux >= 528eb2cb87bc1353235a6384696b4849bde8b0ba < 44c4f999b03f55debb1a0c5ab5c1796895a1adf8`\n- `Linux >= 528eb2cb87bc1353235a6384696b4849bde8b0ba < 366b0e05ee24f5ba62bdc7ec1346038258b9a797`\n- `Linux >= 528eb2cb87bc1353235a6384696b4849bde8b0ba < 834918a77be51419383bf1dda9f02b81ecf26b34`\n- `Linux >= 528eb2cb87bc1353235a6384696b4849bde8b0ba < 202e42e4aa890172366354b233c42c73107a3f59`\n- `Linux 6.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}