143 lines
7.2 KiB
JSON
143 lines
7.2 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-90136",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.788Z",
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"datePublished": "2026-09-17T16:06:35.190Z",
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"dateUpdated": "2026-10-19T08:58:34.349Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:58:34.349Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86/amd/hsmp: Reject negative power cap writes in hwmon\n\nhsmp_hwmon_write() takes the user-supplied hwmon value as a signed long\nand assigns \"val / MICROWATT_PER_MILLIWATT\" to msg.args[0], which is a\n__u32. MICROWATT_PER_MILLIWATT is an unsigned long, so a negative write\nto power1_cap (e.g. \"echo -1 > power1_cap\") is first converted to a huge\nunsigned value by the division and then stored into the u32 argument.\n\nAs a result a nonsensical, multi-gigawatt socket power limit is sent to\nthe SMU via HSMP_SET_SOCKET_POWER_LIMIT instead of the write being\nrejected.\n\nReject negative values with -EINVAL before the conversion.\n\nTested with HSMP enabled:\n\n CAP=$(dirname $(grep -l amd_hsmp_hwmon \\\n /sys/class/hwmon/hwmon*/name | head -1))/power1_cap\n\n # negative write\n echo -1000000 > $CAP ; echo \"ret=$?\"\n # valid positive write must still work\n echo 400000000 > $CAP ; echo \"ret=$?\"\n\nBefore:\n # echo -1000000 > $CAP ; echo \"ret=$?\"\n ret=0 <- accepted; bogus limit sent to SMU\n # echo 400000000 > $CAP ; echo \"ret=$?\"\n ret=0\n\nAfter:\n # echo -1000000 > $CAP ; echo \"ret=$?\"\n bash: echo: write error: Invalid argument\n ret=1 <- rejected with -EINVAL\n # echo 400000000 > $CAP ; echo \"ret=$?\"\n ret=0 <- valid write still works"
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/platform/x86/amd/hsmp/hwmon.c"
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],
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"versions": [
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{
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"version": "92c025db52bb94a032eb3d473bb81e62c19ddbd3",
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"lessThan": "2c09cadec116eba3fdbcb5d8d8641f6777d4a11f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "92c025db52bb94a032eb3d473bb81e62c19ddbd3",
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"lessThan": "1b0a3d915320f1600e5ff43f8bc21b73118480b8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "92c025db52bb94a032eb3d473bb81e62c19ddbd3",
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"lessThan": "3921bb8635ff2836622df1cdf3194d4f3c1835a4",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/platform/x86/amd/hsmp/hwmon.c"
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],
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"versions": [
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{
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"version": "6.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.16",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.52",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "6.18.52"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "7.2.6"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/2c09cadec116eba3fdbcb5d8d8641f6777d4a11f"
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},
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{
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"url": "https://git.kernel.org/stable/c/1b0a3d915320f1600e5ff43f8bc21b73118480b8"
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},
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{
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"url": "https://git.kernel.org/stable/c/3921bb8635ff2836622df1cdf3194d4f3c1835a4"
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}
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],
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"title": "platform/x86/amd/hsmp: Reject negative power cap writes in hwmon",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |