CVE-2026-98655

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98655", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.362Z", "datePublished": "2026-10-18T15:44:05.722Z", "dateUpdated": "2026-10-30T12:38:27.085Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:38:27.085Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Require kernel access for text poke events\n\nPerf events with exclude_kernel=1 can be opened without kernel perf\naccess. However, exclude_kernel does not suppress text-poke sideband\nrecords. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL\nand contains a raw kernel instruction address.\n\nAn unprivileged task can therefore open and mmap a task-local software\nevent with text_poke=1. Both opening a count-only tracepoint event and\nconfiguring UDP GRO for ESP-in-UDP cause updates to inline static calls;\nthe observer receives the relocated addresses of the modified instructions.\nFor a known kernel image, any such address reveals the runtime kernel\ntext base despite KASLR.\n\nCall perf_allow_kernel() whenever attr.text_poke is set, regardless of\nexclude_kernel. Events that neither monitor kernel execution nor request\ntext-poke records retain their existing permissions."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/events/core.c"], "versions": [{"version": "e17d43b93e544f5016c0251d2074c15568d5d963", "lessThan": "4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3", "status": "affected", "versionType": "git"}, {"version": "e17d43b93e544f5016c0251d2074c15568d5d963", "lessThan": "c30886396eb1c0e9fdc4296398dea0db0ab37610", "status": "affected", "versionType": "git"}, {"version": "e17d43b93e544f5016c0251d2074c15568d5d963", "lessThan": "0e26d44b7c64b045adebcf5d614140f811f09752", "status": "affected", "versionType": "git"}, {"version": "e17d43b93e544f5016c0251d2074c15568d5d963", "lessThan": "8c38cb055f6a9651198780e4e4d5283de4039f79", "status": "affected", "versionType": "git"}, {"version": "e17d43b93e544f5016c0251d2074c15568d5d963", "lessThan": "8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7", "status": "affected", "versionType": "git"}, {"version": "e17d43b93e544f5016c0251d2074c15568d5d963", "lessThan": "e506333d1b9f42f1e402acebf1283af3c44a3809", "status": "affected", "versionType": "git"}, {"version": "e17d43b93e544f5016c0251d2074c15568d5d963", "lessThan": "677d0b51ac1a0db55d768c4c6399210b3de0795b", "status": "affected", "versionType": "git"}, {"version": "e17d43b93e544f5016c0251d2074c15568d5d963", "lessThan": "357e8a77a501d96c9517f01f4a211eed5e9c9184", "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/events/core.c"], "versions": [{"version": "5.9", "status": "affected"}, {"version": "0", "lessThan": "5.9", "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": "5.9", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.18.56"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "7.2.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3"}, {"url": "https://git.kernel.org/stable/c/c30886396eb1c0e9fdc4296398dea0db0ab37610"}, {"url": "https://git.kernel.org/stable/c/0e26d44b7c64b045adebcf5d614140f811f09752"}, {"url": "https://git.kernel.org/stable/c/8c38cb055f6a9651198780e4e4d5283de4039f79"}, {"url": "https://git.kernel.org/stable/c/8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7"}, {"url": "https://git.kernel.org/stable/c/e506333d1b9f42f1e402acebf1283af3c44a3809"}, {"url": "https://git.kernel.org/stable/c/677d0b51ac1a0db55d768c4c6399210b3de0795b"}, {"url": "https://git.kernel.org/stable/c/357e8a77a501d96c9517f01f4a211eed5e9c9184"}], "title": "perf: Require kernel access for text poke events", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/events/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3", "status": "affected", "version": "e17d43b93e544f5016c0251d2074c15568d5d963", "versionType": "git"}, {"lessThan": "c30886396eb1c0e9fdc4296398dea0db0ab37610", "status": "affected", "version": "e17d43b93e544f5016c0251d2074c15568d5d963", "versionType": "git"}, {"lessThan": "0e26d44b7c64b045adebcf5d614140f811f09752", "status": "affected", "version": "e17d43b93e544f5016c0251d2074c15568d5d963", "versionType": "git"}, {"lessThan": "8c38cb055f6a9651198780e4e4d5283de4039f79", "status": "affected", "version": "e17d43b93e544f5016c0251d2074c15568d5d963", "versionType": "git"}, {"lessThan": "8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7", "status": "affected", "version": "e17d43b93e544f5016c0251d2074c15568d5d963", "versionType": "git"}, {"lessThan": "e506333d1b9f42f1e402acebf1283af3c44a3809", "status": "affected", "version": "e17d43b93e544f5016c0251d2074c15568d5d963", "versionType": "git"}, {"lessThan": "677d0b51ac1a0db55d768c4c6399210b3de0795b", "status": "affected", "version": "e17d43b93e544f5016c0251d2074c15568d5d963", "versionType": "git"}, {"lessThan": "357e8a77a501d96c9517f01f4a211eed5e9c9184", "status": "affected", "version": "e17d43b93e544f5016c0251d2074c15568d5d963", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/events/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.9"}, {"lessThan": "5.9", "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\nperf: Require kernel access for text poke events\n\nPerf events with exclude_kernel=1 can be opened without kernel perf\naccess. However, exclude_kernel does not suppress text-poke sideband\nrecords. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL\nand contains a raw kernel instruction address.\n\nAn unprivileged task can therefore open and mmap a task-local software\nevent with text_poke=1. Both opening a count-only tracepoint event and\nconfiguring UDP GRO for ESP-in-UDP cause updates to inline static calls;\nthe observer receives the relocated addresses of the modified instructions.\nFor a known kernel image, any such address reveals the runtime kernel\ntext base despite KASLR.\n\nCall perf_allow_kernel() whenever attr.text_poke is set, regardless of\nexclude_kernel. Events that neither monitor kernel execution nor request\ntext-poke records retain their existing permissions."}], "id": "CVE-2026-98655", "lastModified": "2026-10-30T13:21:16.220", "metrics": {}, "published": "2026-10-18T16:17:18.797", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0e26d44b7c64b045adebcf5d614140f811f09752"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/357e8a77a501d96c9517f01f4a211eed5e9c9184"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/677d0b51ac1a0db55d768c4c6399210b3de0795b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8c38cb055f6a9651198780e4e4d5283de4039f79"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c30886396eb1c0e9fdc4296398dea0db0ab37610"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e506333d1b9f42f1e402acebf1283af3c44a3809"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: perf: Require kernel access for text poke events", "id": "2555077", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555077"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-497", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nperf: Require kernel access for text poke events\nPerf events with exclude_kernel=1 can be opened without kernel perf\naccess. However, exclude_kernel does not suppress text-poke sideband\nrecords. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL\nand contains a raw kernel instruction address.\nAn unprivileged task can therefore open and mmap a task-local software\nevent with text_poke=1. Both opening a count-only tracepoint event and\nconfiguring UDP GRO for ESP-in-UDP cause updates to inline static calls;\nthe observer receives the relocated addresses of the modified instructions.\nFor a known kernel image, any such address reveals the runtime kernel\ntext base despite KASLR.\nCall perf_allow_kernel() whenever attr.text_poke is set, regardless of\nexclude_kernel. Events that neither monitor kernel execution nor request\ntext-poke records retain their existing permissions.", "A flaw was found in the Linux kernel. An unprivileged local user could exploit this vulnerability to cause an information disclosure, bypassing Kernel Address Space Layout Randomization (KASLR), a security feature that randomizes kernel memory addresses to hinder exploitation. By opening performance monitoring events configured to track kernel code modifications without requiring elevated permissions, an unprivileged user can observe raw kernel instruction addresses. This leaked address information can assist attackers in planning further attacks against the system."], "name": "CVE-2026-98655", "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": "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": "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-2026-98655\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98655\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98655.mbox"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e17d43b93e544f5016c0251d2074c15568d5d963,8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e17d43b93e544f5016c0251d2074c15568d5d963,e506333d1b9f42f1e402acebf1283af3c44a3809)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e17d43b93e544f5016c0251d2074c15568d5d963,677d0b51ac1a0db55d768c4c6399210b3de0795b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e17d43b93e544f5016c0251d2074c15568d5d963,357e8a77a501d96c9517f01f4a211eed5e9c9184)"}}], "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": "5.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.9)"}}, {"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": "2026-10-18T22:45:04.778575+00:00", "updated": "2026-10-22T21:15:12.502074+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-200", "CWE-264", "CWE-497"]}