CVE-2022-50785

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-50785", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-24T13:02:21.548Z", "datePublished": "2025-12-30T12:03:22.224Z", "dateUpdated": "2026-08-05T08:59:46.661Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:59:46.661Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfsi: occ: Prevent use after free\n\nUse get_device and put_device in the open and close functions to\nmake sure the device doesn't get freed while a file descriptor is\nopen.\nAlso, lock around the freeing of the device buffer and check the\nbuffer before using it in the submit function."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached by opening/writing the local /dev/occN miscdevice or by reading OCC hwmon sysfs attributes that call fsi_occ_submit(); it is not reachable from network packet processing.\nAC:L - An attacker can continuously drive fsi_occ_submit via hwmon reads or /dev/occ I/O while inducing OCC/FSI teardown (host power-cycle or FSI rescan on OpenBMC), so both sides of the remove-vs-submit race are attacker-controlled.\nPR:L - OCC hwmon sensor attributes are mode 0444, so any local user can invoke the vulnerable fsi_occ_submit path; OpenBMC deployments also commonly grant /dev/occ to non-root service/operator accounts without requiring real root.\nUI:N - The attacker directly performs the device I/O and teardown sequence; no separate victim action is required.\nS:U - This is a same-host kernel heap use-after-free within the BMC kernel's security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - occ_remove kvfree()s the shared ~8KB occ->buffer while submit still uses it, yielding a reclaimable use-after-free that enables arbitrary kernel memory disclosure.\nI:H - The same buffer/device UAF is exploitable for heap corruption and control-flow hijacking via reclaim of the freed kvmalloc object or the freed struct occ.\nA:H - Use-after-free of occ->buffer or the occ device object reliably causes kernel oops/panic even when not fully exploited for code execution."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/fsi/fsi-occ.c"], "versions": [{"version": "008d3825a805557464c5e75f9eb806a3aa2f5e6d", "lessThan": "1d5ad0a874ddfcee9f932f54b1d34cbe8b9ddcfe", "status": "affected", "versionType": "git"}, {"version": "008d3825a805557464c5e75f9eb806a3aa2f5e6d", "lessThan": "3593e8efc9f0dac6be70bd5c964eadaa86bf2713", "status": "affected", "versionType": "git"}, {"version": "008d3825a805557464c5e75f9eb806a3aa2f5e6d", "lessThan": "d3e1e24604031b0d83b6c2d38f54eeea265cfcc0", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/fsi/fsi-occ.c"], "versions": [{"version": "5.16", "status": "affected"}, {"version": "0", "lessThan": "5.16", "status": "unaffected", "versionType": "semver"}, {"version": "5.19.17", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0.3", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "5.19.17"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.0.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1d5ad0a874ddfcee9f932f54b1d34cbe8b9ddcfe"}, {"url": "https://git.kernel.org/stable/c/3593e8efc9f0dac6be70bd5c964eadaa86bf2713"}, {"url": "https://git.kernel.org/stable/c/d3e1e24604031b0d83b6c2d38f54eeea265cfcc0"}], "title": "fsi: occ: Prevent use after free", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/fsi/fsi-occ.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1d5ad0a874ddfcee9f932f54b1d34cbe8b9ddcfe", "status": "affected", "version": "008d3825a805557464c5e75f9eb806a3aa2f5e6d", "versionType": "git"}, {"lessThan": "3593e8efc9f0dac6be70bd5c964eadaa86bf2713", "status": "affected", "version": "008d3825a805557464c5e75f9eb806a3aa2f5e6d", "versionType": "git"}, {"lessThan": "d3e1e24604031b0d83b6c2d38f54eeea265cfcc0", "status": "affected", "version": "008d3825a805557464c5e75f9eb806a3aa2f5e6d", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/fsi/fsi-occ.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.16"}, {"lessThan": "5.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.19.*", "status": "unaffected", "version": "5.19.17", "versionType": "semver"}, {"lessThanOrEqual": "6.0.*", "status": "unaffected", "version": "6.0.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfsi: occ: Prevent use after free\n\nUse get_device and put_device in the open and close functions to\nmake sure the device doesn't get freed while a file descriptor is\nopen.\nAlso, lock around the freeing of the device buffer and check the\nbuffer before using it in the submit function."}], "id": "CVE-2022-50785", "lastModified": "2026-08-04T10:18:24.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2025-12-30T12:15:44.143", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1d5ad0a874ddfcee9f932f54b1d34cbe8b9ddcfe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3593e8efc9f0dac6be70bd5c964eadaa86bf2713"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d3e1e24604031b0d83b6c2d38f54eeea265cfcc0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: fsi: occ: Prevent use after free", "id": "2426040", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2426040"}, "csaw": false, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfsi: occ: Prevent use after free\nUse get_device and put_device in the open and close functions to\nmake sure the device doesn't get freed while a file descriptor is\nopen.\nAlso, lock around the freeing of the device buffer and check the\nbuffer before using it in the submit function."], "name": "CVE-2022-50785", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-12-30T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50785\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50785\nhttps://lore.kernel.org/linux-cve-announce/2025123028-CVE-2022-50785-ed95@gregkh/T"]}

{}