CVE-2026-98856

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98856", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.376Z", "datePublished": "2026-10-18T15:51:12.359Z", "dateUpdated": "2026-10-30T12:40:17.396Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:40:17.396Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkprobes: Skip disarmed probes when checking optkprobe overlap\n\nOn x86, an optkprobe at A replaces five bytes with a jump. If a disabled\nprobe B is at A+2, get_optimized_kprobe() stops at B when arming a new\nprobe C at A+4. It leaves A optimized:\n\n A A+1 A+2 A+3 A+4\n A's jump | e9 | d0 | d1 | d2 | d3 |\n after C | e9 | d0 | d1 | d2 | cc |\n\nThe INT3 for C overwrites the last byte of A's jump displacement, so\nexecution can jump to the wrong address. B can have prepared optinsns\nwhile disarmed, but has no jump to unoptimize.\n\nContinue past disarmed and unprepared probes to find the active optimized\nprobe before arming a probe in its jump."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/kprobes.c"], "versions": [{"version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "lessThan": "e29e819cacfb4e3cd56d41eb704ab4718d6d2915", "status": "affected", "versionType": "git"}, {"version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "lessThan": "ab9ed9faa67bf67383ff7e1479655e232a843c2b", "status": "affected", "versionType": "git"}, {"version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "lessThan": "3b0f604df9e2b9a456f1ae5266a439998c4c8826", "status": "affected", "versionType": "git"}, {"version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "lessThan": "3f968dcdf018861129f97910fa7bd680d939a9b0", "status": "affected", "versionType": "git"}, {"version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "lessThan": "985a568171e7bdba6dcde3420d0e5bb515813457", "status": "affected", "versionType": "git"}, {"version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "lessThan": "6745fa65f4115045431c0c15610e876855a04625", "status": "affected", "versionType": "git"}, {"version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "lessThan": "526fac219e8b7d3369b43026bd0a1df51b811cd4", "status": "affected", "versionType": "git"}, {"version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "lessThan": "7a39c732a22ec4a369af9e19fbe3d666ec83eec4", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/kprobes.c"], "versions": [{"version": "2.6.34", "status": "affected"}, {"version": "0", "lessThan": "2.6.34", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.56", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.10", "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": "2.6.34", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.18.56"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.2.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e29e819cacfb4e3cd56d41eb704ab4718d6d2915"}, {"url": "https://git.kernel.org/stable/c/ab9ed9faa67bf67383ff7e1479655e232a843c2b"}, {"url": "https://git.kernel.org/stable/c/3b0f604df9e2b9a456f1ae5266a439998c4c8826"}, {"url": "https://git.kernel.org/stable/c/3f968dcdf018861129f97910fa7bd680d939a9b0"}, {"url": "https://git.kernel.org/stable/c/985a568171e7bdba6dcde3420d0e5bb515813457"}, {"url": "https://git.kernel.org/stable/c/6745fa65f4115045431c0c15610e876855a04625"}, {"url": "https://git.kernel.org/stable/c/526fac219e8b7d3369b43026bd0a1df51b811cd4"}, {"url": "https://git.kernel.org/stable/c/7a39c732a22ec4a369af9e19fbe3d666ec83eec4"}], "title": "kprobes: Skip disarmed probes when checking optkprobe overlap", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/kprobes.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "e29e819cacfb4e3cd56d41eb704ab4718d6d2915", "status": "affected", "version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "versionType": "git"}, {"lessThan": "ab9ed9faa67bf67383ff7e1479655e232a843c2b", "status": "affected", "version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "versionType": "git"}, {"lessThan": "3b0f604df9e2b9a456f1ae5266a439998c4c8826", "status": "affected", "version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "versionType": "git"}, {"lessThan": "3f968dcdf018861129f97910fa7bd680d939a9b0", "status": "affected", "version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "versionType": "git"}, {"lessThan": "985a568171e7bdba6dcde3420d0e5bb515813457", "status": "affected", "version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "versionType": "git"}, {"lessThan": "6745fa65f4115045431c0c15610e876855a04625", "status": "affected", "version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "versionType": "git"}, {"lessThan": "526fac219e8b7d3369b43026bd0a1df51b811cd4", "status": "affected", "version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "versionType": "git"}, {"lessThan": "7a39c732a22ec4a369af9e19fbe3d666ec83eec4", "status": "affected", "version": "afd66255b9a48f5851326ddae50e2203fbf71dc9", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/kprobes.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.34"}, {"lessThan": "2.6.34", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.113", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.56", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.10", "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\nkprobes: Skip disarmed probes when checking optkprobe overlap\n\nOn x86, an optkprobe at A replaces five bytes with a jump. If a disabled\nprobe B is at A+2, get_optimized_kprobe() stops at B when arming a new\nprobe C at A+4. It leaves A optimized:\n\n A A+1 A+2 A+3 A+4\n A's jump | e9 | d0 | d1 | d2 | d3 |\n after C | e9 | d0 | d1 | d2 | cc |\n\nThe INT3 for C overwrites the last byte of A's jump displacement, so\nexecution can jump to the wrong address. B can have prepared optinsns\nwhile disarmed, but has no jump to unoptimize.\n\nContinue past disarmed and unprepared probes to find the active optimized\nprobe before arming a probe in its jump."}], "id": "CVE-2026-98856", "lastModified": "2026-10-30T13:21:31.220", "metrics": {}, "published": "2026-10-18T16:17:40.050", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3b0f604df9e2b9a456f1ae5266a439998c4c8826"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3f968dcdf018861129f97910fa7bd680d939a9b0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/526fac219e8b7d3369b43026bd0a1df51b811cd4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6745fa65f4115045431c0c15610e876855a04625"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7a39c732a22ec4a369af9e19fbe3d666ec83eec4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/985a568171e7bdba6dcde3420d0e5bb515813457"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ab9ed9faa67bf67383ff7e1479655e232a843c2b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e29e819cacfb4e3cd56d41eb704ab4718d6d2915"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: kprobes: Skip disarmed probes when checking optkprobe overlap", "id": "2555221", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555221"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1285", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nkprobes: Skip disarmed probes when checking optkprobe overlap\nOn x86, an optkprobe at A replaces five bytes with a jump. If a disabled\nprobe B is at A+2, get_optimized_kprobe() stops at B when arming a new\nprobe C at A+4. It leaves A optimized:\nA A+1 A+2 A+3 A+4\nA's jump | e9 | d0 | d1 | d2 | d3 |\nafter C | e9 | d0 | d1 | d2 | cc |\nThe INT3 for C overwrites the last byte of A's jump displacement, so\nexecution can jump to the wrong address. B can have prepared optinsns\nwhile disarmed, but has no jump to unoptimize.\nContinue past disarmed and unprepared probes to find the active optimized\nprobe before arming a probe in its jump.", "A flaw was found in the Linux kernel's kernel probes (kprobes) tracing subsystem. When arming an optimized probe near an inactive probe, the overlap detection check fails to identify an active jump instruction. A privileged local user can exploit this issue by registering specific overlapping tracepoints, causing the kernel to overwrite instruction bytes and branch to an invalid address. This flaw can lead to a kernel crash resulting in a Denial of Service (DoS) or potentially arbitrary code execution within the kernel context."], "name": "CVE-2026-98856", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98856\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98856\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98856.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[afd66255b9a48f5851326ddae50e2203fbf71dc9,985a568171e7bdba6dcde3420d0e5bb515813457)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[afd66255b9a48f5851326ddae50e2203fbf71dc9,6745fa65f4115045431c0c15610e876855a04625)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[afd66255b9a48f5851326ddae50e2203fbf71dc9,526fac219e8b7d3369b43026bd0a1df51b811cd4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[afd66255b9a48f5851326ddae50e2203fbf71dc9,7a39c732a22ec4a369af9e19fbe3d666ec83eec4)"}}], "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": "semver", "value": "2.6.34"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.34)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.113,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.56,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.10,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "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": "2026-10-18T21:15:14.281391+00:00", "updated": "2026-10-24T03:30:15.417523+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}