CVE-2026-98248

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98248", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.330Z", "datePublished": "2026-10-06T08:45:16.693Z", "dateUpdated": "2026-10-19T09:16:19.730Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:16:19.730Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: percpu: Fix LSE operations on {8,16}-bit types\n\nThe assembly for __percpu_##name##_case_##sz() and\n__percpu_##name##_return_case_##sz() doesn't use the 'sfx' macro\nargument to form the LSE instruction. Without 'sfx', a W register\nargument will imply a 32-bit memory location, and consequently\n{8,16}-bit ops will erroneously read and write 32 bits of memory when\nthe LSE instruction is used.\n\nFix this by appending 'sfx' to 'op_lse' to LSE instruction. It is not\nnecessary (and not valid) to append 'sfx' to 'op_llsc', as 'op_llsc' is\na register-register operation which does not access memory (and does not\ntake a size suffix)."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/include/asm/percpu.h"], "versions": [{"version": "959bf2fd03b59fc107584c21425f3dc73c49f762", "lessThan": "d69ab4480e49bf925f4781afcc9f284affcb96b6", "status": "affected", "versionType": "git"}, {"version": "959bf2fd03b59fc107584c21425f3dc73c49f762", "lessThan": "390742871a723b52de9b92a94c0d1c85a2531e3e", "status": "affected", "versionType": "git"}, {"version": "959bf2fd03b59fc107584c21425f3dc73c49f762", "lessThan": "843ace1d0a39e9b1cfcbfb3856a7b0fbdd9cd003", "status": "affected", "versionType": "git"}, {"version": "959bf2fd03b59fc107584c21425f3dc73c49f762", "lessThan": "8cf2093f5372952a9ebc805c418d45df7112cd14", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/include/asm/percpu.h"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.54", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.8", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "5.0", "versionEndExcluding": "6.12.112"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.54"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.2.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d69ab4480e49bf925f4781afcc9f284affcb96b6"}, {"url": "https://git.kernel.org/stable/c/390742871a723b52de9b92a94c0d1c85a2531e3e"}, {"url": "https://git.kernel.org/stable/c/843ace1d0a39e9b1cfcbfb3856a7b0fbdd9cd003"}, {"url": "https://git.kernel.org/stable/c/8cf2093f5372952a9ebc805c418d45df7112cd14"}], "title": "arm64: percpu: Fix LSE operations on {8,16}-bit types", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/arm64/include/asm/percpu.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "d69ab4480e49bf925f4781afcc9f284affcb96b6", "status": "affected", "version": "959bf2fd03b59fc107584c21425f3dc73c49f762", "versionType": "git"}, {"lessThan": "390742871a723b52de9b92a94c0d1c85a2531e3e", "status": "affected", "version": "959bf2fd03b59fc107584c21425f3dc73c49f762", "versionType": "git"}, {"lessThan": "843ace1d0a39e9b1cfcbfb3856a7b0fbdd9cd003", "status": "affected", "version": "959bf2fd03b59fc107584c21425f3dc73c49f762", "versionType": "git"}, {"lessThan": "8cf2093f5372952a9ebc805c418d45df7112cd14", "status": "affected", "version": "959bf2fd03b59fc107584c21425f3dc73c49f762", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/arm64/include/asm/percpu.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.0"}, {"lessThan": "5.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.112", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.54", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\narm64: percpu: Fix LSE operations on {8,16}-bit types\n\nThe assembly for __percpu_##name##_case_##sz() and\n__percpu_##name##_return_case_##sz() doesn't use the 'sfx' macro\nargument to form the LSE instruction. Without 'sfx', a W register\nargument will imply a 32-bit memory location, and consequently\n{8,16}-bit ops will erroneously read and write 32 bits of memory when\nthe LSE instruction is used.\n\nFix this by appending 'sfx' to 'op_lse' to LSE instruction. It is not\nnecessary (and not valid) to append 'sfx' to 'op_llsc', as 'op_llsc' is\na register-register operation which does not access memory (and does not\ntake a size suffix)."}], "id": "CVE-2026-98248", "lastModified": "2026-10-19T10:18:25.707", "metrics": {}, "published": "2026-10-06T09:18:13.143", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/390742871a723b52de9b92a94c0d1c85a2531e3e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/843ace1d0a39e9b1cfcbfb3856a7b0fbdd9cd003"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8cf2093f5372952a9ebc805c418d45df7112cd14"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d69ab4480e49bf925f4781afcc9f284affcb96b6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: arm64: percpu: Fix LSE operations on {8,16}-bit types", "id": "2546465", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2546465"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\narm64: percpu: Fix LSE operations on {8,16}-bit types\nThe assembly for __percpu_##name##_case_##sz() and\n__percpu_##name##_return_case_##sz() doesn't use the 'sfx' macro\nargument to form the LSE instruction. Without 'sfx', a W register\nargument will imply a 32-bit memory location, and consequently\n{8,16}-bit ops will erroneously read and write 32 bits of memory when\nthe LSE instruction is used.\nFix this by appending 'sfx' to 'op_lse' to LSE instruction. It is not\nnecessary (and not valid) to append 'sfx' to 'op_llsc', as 'op_llsc' is\na register-register operation which does not access memory (and does not\ntake a size suffix).", "A flaw was found in the Linux kernel's arm64 per-CPU memory operations. When performing atomic operations on 8-bit and 16-bit variables using Large System Extensions (LSE), the assembly instructions fail to specify the proper size suffix, erroneously reading and writing 32 bits of memory. A local user could exploit this behavior to corrupt adjacent kernel memory, potentially resulting in system instability or a denial of service (DoS)."], "name": "CVE-2026-98248", "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"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98248\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98248\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98248.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[959bf2fd03b59fc107584c21425f3dc73c49f762,d69ab4480e49bf925f4781afcc9f284affcb96b6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[959bf2fd03b59fc107584c21425f3dc73c49f762,390742871a723b52de9b92a94c0d1c85a2531e3e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[959bf2fd03b59fc107584c21425f3dc73c49f762,843ace1d0a39e9b1cfcbfb3856a7b0fbdd9cd003)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[959bf2fd03b59fc107584c21425f3dc73c49f762,8cf2093f5372952a9ebc805c418d45df7112cd14)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.112,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.54,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.8,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-06T12:45:17.644376+00:00", "updated": "2026-10-11T18:45:19.291268+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}