{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31528", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.111Z", "datePublished": "2026-04-22T13:54:41.180Z", "dateUpdated": "2026-05-11T22:10:32.460Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:10:32.460Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Make sure to use pmu_ctx->pmu for groups\n\nOliver reported that x86_pmu_del() ended up doing an out-of-bound memory access\nwhen group_sched_in() fails and needs to roll back.\n\nThis *should* be handled by the transaction callbacks, but he found that when\nthe group leader is a software event, the transaction handlers of the wrong PMU\nare used. Despite the move_group case in perf_event_open() and group_sched_in()\nusing pmu_ctx->pmu.\n\nTurns out, inherit uses event->pmu to clone the events, effectively undoing the\nmove_group case for all inherited contexts. Fix this by also making inherit use\npmu_ctx->pmu, ensuring all inherited counters end up in the same pmu context.\n\nSimilarly, __perf_event_read() should use equally use pmu_ctx->pmu for the\ngroup case."}], "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"}}], "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": "bd27568117664b8b3e259721393df420ed51f57b", "lessThan": "656f35b463995bee024d948440128230aacd81e1", "status": "affected", "versionType": "git"}, {"version": "bd27568117664b8b3e259721393df420ed51f57b", "lessThan": "3a696e84a8b1fafdd774bb30d62919faf844d9e4", "status": "affected", "versionType": "git"}, {"version": "bd27568117664b8b3e259721393df420ed51f57b", "lessThan": "35f7914e54fe7f13654c22ee045b05e4b6d8062b", "status": "affected", "versionType": "git"}, {"version": "bd27568117664b8b3e259721393df420ed51f57b", "lessThan": "4c759446046500a1a6785b25725725c3ff087ace", "status": "affected", "versionType": "git"}, {"version": "bd27568117664b8b3e259721393df420ed51f57b", "lessThan": "4b9ce671960627b2505b3f64742544ae9801df97", "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": "6.2", "status": "affected"}, {"version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.2", "versionEndExcluding": "6.6.131"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.80"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.19.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1"}, {"url": "https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4"}, {"url": "https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062b"}, {"url": "https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087ace"}, {"url": "https://git.kernel.org/stable/c/4b9ce671960627b2505b3f64742544ae9801df97"}], "title": "perf: Make sure to use pmu_ctx->pmu for groups", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"bugzilla": {"description": "kernel: perf: Make sure to use pmu_ctx->pmu for groups", "id": "2460668", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460668"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in the Linux kernel's performance monitoring unit (PMU) subsystem. This vulnerability occurs when handling performance event groups, specifically during the rollback of `group_sched_in()` operations. An issue with how inherited contexts use event pointers can lead to an out-of-bounds memory access. This could allow a local attacker to cause a denial of service or potentially escalate privileges."], "name": "CVE-2026-31528", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31528\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31528\nhttps://lore.kernel.org/linux-cve-announce/2026042214-CVE-2026-31528-b375@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd27568117664b8b3e259721393df420ed51f57b,656f35b463995bee024d948440128230aacd81e1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd27568117664b8b3e259721393df420ed51f57b,3a696e84a8b1fafdd774bb30d62919faf844d9e4]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd27568117664b8b3e259721393df420ed51f57b,35f7914e54fe7f13654c22ee045b05e4b6d8062b]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd27568117664b8b3e259721393df420ed51f57b,4c759446046500a1a6785b25725725c3ff087ace]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd27568117664b8b3e259721393df420ed51f57b,4b9ce671960627b2505b3f64742544ae9801df97]"}}], "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": "6.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.131,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.80,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.21,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.11,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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"}], "analysis": {"en": {"generated_at": "2026-04-28T20:43:29.023252+00:00", "value": {"mitigation_remediation": ["Update the kernel to a version that includes the fix from commit 35f7914e54fe7f13654c22ee045b05e4b6d8062b following your distribution\u2019s normal update procedures.", "If a patched package is not yet available from your vendor, download the Linux kernel source, apply the patch that implements the change, rebuild the kernel, and install the new image.", "As a temporary countermeasure, limit or disable the perf_event subsystem for untrusted users, for example by removing the perf_event_open capability from user namespaces or configuring systemd sandboxing to block access to that system call."], "summary": {"action": "Apply Patch", "impact": "Out-of-Bounds Kernel Memory Access"}, "threat_synthesis": {"affected_systems": "All Linux kernel builds that incorporate the kernel version before the commit that fixes the bug (35f7914e54fe7f13654c22ee045b05e4b6d8062b). Because the advisory lists only the generic Linux kernel CPE, any distribution using a derivative of that version is potentially vulnerable until an update is applied.", "description_and_impact": "The flaw is in the Linux kernel\u2019s perf subsystem. When a group operation rolls back, the code uses the wrong PMU context, causing an out\u2011of\u2011bounds memory access that corrupts kernel data structures. This memory corruption could let a local attacker tamper with kernel state or cause a denial of service.", "risk_and_exploitability": "The EPSS score remains <1% and the vulnerability is not listed in the CISA KEV catalog. The CVSS score is 7.8, indicating a high severity. This out-of-bound memory access requires local interaction with the perf subsystem; an attacker with sufficient privilege can trigger the error, potentially leading to kernel memory corruption and denial of service."}}}}, "created": "2026-04-22T19:00:07.809326+00:00", "updated": "2026-04-28T20:45:16.608630+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}