{"id":"CVE-2026-31624","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nHID: core: clamp report_size in s32ton() to avoid undefined shift\n\ns32ton() shifts by n-1 where n is the field's report_size, a value that\ncomes directly from a HID dev…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nHID: core: clamp report_size in s32ton() to avoid undefined shift\n\ns32ton() shifts by n-1 where n is the field's report_size, a value that\ncomes directly from a HID dev…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.20.1, < 6.6.136","linux_kernel >= 6.7, < 6.12.83","linux_kernel >= 6.13, < 6.18.24","linux_kernel >= 6.19, < 6.19.14","linux_kernel >= 7.0, < 7.0.1","linux_kernel = 2.6.20"],"patched":["linux_kernel 7.0.1"],"published":"2026-04-24","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:19:13.317","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-31624","references":[{"url":"https://git.kernel.org/stable/c/0ab048dbdb1daacf17d52e9252297eb6e1298e49","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/58386f00af710922cafb0fb69211497beddfaa95","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/69c02ffde6ed4d535fa4e693a9e572729cad3d0d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/76ad02854a30c394e0c076e6e6bed0a388573a94","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8a8333237f1f5caab8d4c3d2c2e7578c4263a97f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/932ae5309e53561197aa7d1606c7cf63af10e24f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/97014719bb8fccb1ffcbbc299e84b1f11b114195","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ea363a34086ddb4231adc581a7f36c39ec154bfc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/eb415ddaf25e09ddb8fe5736a70c9de2e6462534","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00166,"epssPercentile":0.05477,"ingestedAt":"2026-10-15T03:30:12.860Z","slug":"CVE-2026-31624","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nHID: core: clamp report_size in s32ton() to avoid undefined shift\n\ns32ton() shifts by n-1 where n is the field's report_size, a value that\ncomes directly from a HID device.  The HID parser bounds report_size\nonly to <= 256, so a broken HID device can supply a report descriptor\nwith a wide field that triggers shift exponents up to 256 on a 32-bit\ntype when an output report is built via hid_output_field() or\nhid_set_field().\n\nCommit ec61b41918587 (\"HID: core: fix shift-out-of-bounds in\nhid_report_raw_event\") added the same n > 32 clamp to the function\nsnto32(), but s32ton() was never given the same fix as I guess syzbot\nhadn't figured out how to fuzz a device the same way.\n\nFix this up by just clamping the max value of n, just like snto32()\ndoes.\n\n## Affected\n\n- `linux_kernel >= 2.6.20.1, < 6.6.136`\n- `linux_kernel >= 6.7, < 6.12.83`\n- `linux_kernel >= 6.13, < 6.18.24`\n- `linux_kernel >= 6.19, < 6.19.14`\n- `linux_kernel >= 7.0, < 7.0.1`\n- `linux_kernel = 2.6.20`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.0.1`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}