HID: core: clamp report_size in s32ton() to avoid undefined shift
In the Linux kernel, the following vulnerability has been resolved: HID: core: clamp report_size in s32ton() to avoid undefined shift s32ton() shifts by n-1 where n is the field's report_size, a value that comes directly from a HID device. The HID parser bounds report_size only to <= 256, so a broken HID device can supply a report descriptor with a wide field that triggers shift exponents up to 256 on a 32-bit type when an output report is built via hid_output_field() or hid_set_field(). Commit ec61b41918587 ("HID: core: fix shift-out-of-bounds in hid_report_raw_event") added the same n > 32 clamp to the function snto32(), but s32ton() was never given the same fix as I guess syzbot hadn't figured out how to fuzz a device the same way. Fix this up by just clamping the max value of n, just like snto32() does.
CVE-2026-31624
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31624
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "dde5845a529ff753364a6d1aea61180946270bfa",
"lessThan": "76ad02854a30c394e0c076e6e6bed0a388573a94",
"versionType": "git"
},
{
"status": "affected",
"version": "dde5845a529ff753364a6d1aea61180946270bfa",
"lessThan": "eb415ddaf25e09ddb8fe5736a70c9de2e6462534",
"versionType": "git"
},
{
"status": "affected",
"version": "dde5845a529ff753364a6d1aea61180946270bfa",
"lessThan": "0ab048dbdb1daacf17d52e9252297eb6e1298e49",
"versionType": "git"
},
{
"status": "affected",
"version": "dde5845a529ff753364a6d1aea61180946270bfa",
"lessThan": "932ae5309e53561197aa7d1606c7cf63af10e24f",
"versionType": "git"
},
{
"status": "affected",
"version": "dde5845a529ff753364a6d1aea61180946270bfa",
"lessThan": "58386f00af710922cafb0fb69211497beddfaa95",
"versionType": "git"
},
{
"status": "affected",
"version": "dde5845a529ff753364a6d1aea61180946270bfa",
"lessThan": "8a8333237f1f5caab8d4c3d2c2e7578c4263a97f",
"versionType": "git"
},
{
"status": "affected",
"version": "dde5845a529ff753364a6d1aea61180946270bfa",
"lessThan": "ea363a34086ddb4231adc581a7f36c39ec154bfc",
"versionType": "git"
},
{
"status": "affected",
"version": "dde5845a529ff753364a6d1aea61180946270bfa",
"lessThan": "97014719bb8fccb1ffcbbc299e84b1f11b114195",
"versionType": "git"
},
{
"status": "affected",
"version": "dde5845a529ff753364a6d1aea61180946270bfa",
"lessThan": "69c02ffde6ed4d535fa4e693a9e572729cad3d0d",
"versionType": "git"
}
],
"programFiles": [
"drivers/hid/hid-core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.20"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.20",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.136",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.83",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.24",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.14",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0.1",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/hid/hid-core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31624
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #28301 · Revision 1
- Added to Heist Feed
- Publisher date