{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2024-47717", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-47717", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-10-21T11:53:48.181Z", "updatedAt": "2026-05-11T20:39:25.565Z", "importedAt": "2026-10-24T01:57:16.009Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "RISC-V: KVM: Don't zero-out PMU snapshot area before freeing data", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: KVM: Don't zero-out PMU snapshot area before freeing data\n\nWith the latest Linux-6.11-rc3, the below NULL pointer crash is observed\nwhen SBI PMU snapshot is enabled for the guest and the guest is forcefully\npowered-off.\n\n Unable to handle kernel NULL pointer dereference at virtual address 0000000000000508\n Oops [#1]\n Modules linked in: kvm\n CPU: 0 UID: 0 PID: 61 Comm: term-poll Not tainted 6.11.0-rc3-00018-g44d7178dd77a #3\n Hardware name: riscv-virtio,qemu (DT)\n epc : __kvm_write_guest_page+0x94/0xa6 [kvm]\n ra : __kvm_write_guest_page+0x54/0xa6 [kvm]\n epc : ffffffff01590e98 ra : ffffffff01590e58 sp : ffff8f80001f39b0\n gp : ffffffff81512a60 tp : ffffaf80024872c0 t0 : ffffaf800247e000\n t1 : 00000000000007e0 t2 : 0000000000000000 s0 : ffff8f80001f39f0\n s1 : 00007fff89ac4000 a0 : ffffffff015dd7e8 a1 : 0000000000000086\n a2 : 0000000000000000 a3 : ffffaf8000000000 a4 : ffffaf80024882c0\n a5 : 0000000000000000 a6 : ffffaf800328d780 a7 : 00000000000001cc\n s2 : ffffaf800197bd00 s3 : 00000000000828c4 s4 : ffffaf800248c000\n s5 : ffffaf800247d000 s6 : 0000000000001000 s7 : 0000000000001000\n s8 : 0000000000000000 s9 : 00007fff861fd500 s10: 0000000000000001\n s11: 0000000000800000 t3 : 00000000000004d3 t4 : 00000000000004d3\n t5 : ffffffff814126e0 t6 : ffffffff81412700\n status: 0000000200000120 badaddr: 0000000000000508 cause: 000000000000000d\n [] __kvm_write_guest_page+0x94/0xa6 [kvm]\n [] kvm_vcpu_write_guest+0x56/0x90 [kvm]\n [] kvm_pmu_clear_snapshot_area+0x42/0x7e [kvm]\n [] kvm_riscv_vcpu_pmu_deinit.part.0+0xe0/0x14e [kvm]\n [] kvm_riscv_vcpu_pmu_deinit+0x1a/0x24 [kvm]\n [] kvm_arch_vcpu_destroy+0x28/0x4c [kvm]\n [] kvm_destroy_vcpus+0x5a/0xda [kvm]\n [] kvm_arch_destroy_vm+0x14/0x28 [kvm]\n [] kvm_destroy_vm+0x168/0x2a0 [kvm]\n [] kvm_put_kvm+0x3c/0x58 [kvm]\n [] kvm_vm_release+0x22/0x2e [kvm]\n\nClearly, the kvm_vcpu_write_guest() function is crashing because it is\nbeing called from kvm_pmu_clear_snapshot_area() upon guest tear down.\n\nTo address the above issue, simplify the kvm_pmu_clear_snapshot_area() to\nnot zero-out PMU snapshot area from kvm_pmu_clear_snapshot_area() because\nthe guest is anyway being tore down.\n\nThe kvm_pmu_clear_snapshot_area() is also called when guest changes\nPMU snapshot area of a VCPU but even in this case the previous PMU\nsnaphsot area must not be zeroed-out because the guest might have\nreclaimed the pervious PMU snapshot area for some other purpose.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "c2f41ddbcdd75689d9f512638a40263e3127be93", "status": "affected", "versionType": "git", "lessThan": "81aa95fd5bd14ff49617f07fa79a8d1f1cf2ce9a" }, { "version": "c2f41ddbcdd75689d9f512638a40263e3127be93", "status": "affected", "versionType": "git", "lessThan": "6d0a5dcfc78bd18f2abb9641f83380135494559b" }, { "version": "c2f41ddbcdd75689d9f512638a40263e3127be93", "status": "affected", "versionType": "git", "lessThan": "47d40d93292d9cff8dabb735bed83d930fa03950" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.10", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.10" }, { "version": "6.10.13", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.10.*" }, { "version": "6.11.2", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.11.*" }, { "version": "6.12", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }