CVE-2026-43303

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The swap code uses\npage->private to track swap count continuations, assuming freshly\nallocated pages have page->private == 0. When stale values are present,\nswap_count_continued() incorrectly assumes the continuation list is valid\nand iterates over uninitialized page->lru containing LIST_POISON values,\ncausing a crash:\n\n KASAN: maybe wild-memory-access in range [0xdead000000000100-0xdead000000000107]\n RIP: 0010:__do_sys_swapoff+0x1151/0x1860\n\nFix this by clearing page->private in free_pages_prepare(), ensuring all\nfreed pages have clean state regardless of previous use."}], "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"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable swap continuation and page allocator paths are reached through local memory-management activity such as fork/swap/reclaim or swap administration, not by remote packets or physical access.\nAC:L - There is no attacker-uncontrolled race; a local attacker can repeatedly create swap pressure and duplicate swapped entries to 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impact.\nA:H - The reported failure is a KASAN wild-memory-access crash in __do_sys_swapoff, and the same invalid list traversal can oops or panic the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/page_alloc.c"], "versions": [{"version": "3b8000ae185cb068adbda5f966a3835053c85fd4", "lessThan": "e7790ab165713b79b1617ce659742ceb3a859d05", "status": "affected", "versionType": "git"}, {"version": "3b8000ae185cb068adbda5f966a3835053c85fd4", "lessThan": "3edb8ebbf79b9016040e8f3421d723ae3d542b32", "status": "affected", "versionType": "git"}, {"version": "3b8000ae185cb068adbda5f966a3835053c85fd4", "lessThan": "f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b", "status": "affected", "versionType": "git"}, {"version": "3b8000ae185cb068adbda5f966a3835053c85fd4", "lessThan": "23b82b7a26182ad840ae67d390d7ec9771e8c00f", "status": "affected", "versionType": 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When these pages are later allocated as\nhigh-order pages and split via split_page(), tail pages retain stale\npage->private values.\n\nThis causes a use-after-free in the swap subsystem. The swap code uses\npage->private to track swap count continuations, assuming freshly\nallocated pages have page->private == 0. When stale values are present,\nswap_count_continued() incorrectly assumes the continuation list is valid\nand iterates over uninitialized page->lru containing LIST_POISON values,\ncausing a crash:\n\n KASAN: maybe wild-memory-access in range [0xdead000000000100-0xdead000000000107]\n RIP: 0010:__do_sys_swapoff+0x1151/0x1860\n\nFix this by clearing page->private in free_pages_prepare(), ensuring all\nfreed pages have clean state regardless of previous use."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.176", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.143", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.93", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.16", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.6", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "5.18"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:27:08.856Z"}}}, "cveMetadata": {"cveId": "CVE-2026-43303", "state": "PUBLISHED", "dateUpdated": "2026-11-10T12:46:40.101Z", "dateReserved": "2026-05-01T14:12:56.000Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-08T13:11:23.561Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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GNU/Linux subsystem", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B1BE1177-E500-439D-B3E5-0E63F54C1BE6", "versionEndExcluding": "6.18.16", "versionStartIncluding": "5.18.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67", "versionEndExcluding": "6.19.6", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.18:-:*:*:*:*:*:*", "matchCriteriaId": "0384FA0A-DE99-48D7-84E3-46ED0C3B5E03", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.18:rc4:*:*:*:*:*:*", "matchCriteriaId": "DA5F085D-52F3-4EE2-8353-455D1A6FE073", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.18:rc5:*:*:*:*:*:*", "matchCriteriaId": "D6EE5B78-0D83-4715-893C-ABD69B49E7FC", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.18:rc6:*:*:*:*:*:*", "matchCriteriaId": "EE723F14-047B-4FCF-B109-E0542EDFB063", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.18:rc7:*:*:*:*:*:*", "matchCriteriaId": "2FCFCE58-5118-4D05-864E-C82CF20EABE5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.18:rc9:*:*:*:*:*:*", "matchCriteriaId": "9C3E5BC9-613C-4362-BF02-153A5BBFFB2F", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: clear page->private in free_pages_prepare()\n\nSeveral subsystems (slub, shmem, ttm, etc.) use page->private but don't\nclear it before freeing pages. When these pages are later allocated as\nhigh-order pages and split via split_page(), tail pages retain stale\npage->private values.\n\nThis causes a use-after-free in the swap subsystem. The swap code uses\npage->private to track swap count continuations, assuming freshly\nallocated pages have page->private == 0. When stale values are present,\nswap_count_continued() incorrectly assumes the continuation list is valid\nand iterates over uninitialized page->lru containing LIST_POISON values,\ncausing a crash:\n\n KASAN: maybe wild-memory-access in range [0xdead000000000100-0xdead000000000107]\n RIP: 0010:__do_sys_swapoff+0x1151/0x1860\n\nFix this by clearing page->private in free_pages_prepare(), ensuring all\nfreed pages have clean state regardless of previous use."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/page_alloc: limpiar page -> private en free_pages_prepare()\n\nVarios subsistemas (slub, shmem, ttm, etc.) usan page -> private pero no lo limpian antes de liberar p\u00e1ginas. Cuando estas p\u00e1ginas son asignadas posteriormente como p\u00e1ginas de orden superior y divididas a trav\u00e9s de split_page(), las p\u00e1ginas de cola retienen valores obsoletos de page -> private.\n\nEsto causa un uso despu\u00e9s de liberaci\u00f3n en el subsistema de intercambio. El c\u00f3digo de intercambio usa page -> private para rastrear continuaciones de conteo de intercambio, asumiendo que las p\u00e1ginas reci\u00e9n asignadas tienen page -> private == 0. Cuando hay valores obsoletos presentes, swap_count_continued() asume incorrectamente que la lista de continuaci\u00f3n es v\u00e1lida e itera sobre page -> lru no inicializado que contiene valores LIST_POISON, causando un fallo:\n\nKASAN: posible acceso a memoria salvaje en el rango [0x dead000000000100-0x dead000000000107]\nRIP: 0010:__do_sys_swapoff+0x 1151/0x 1860\n\nSolucione esto limpiando page -> private en free_pages_prepare(), asegurando que todas las p\u00e1ginas liberadas tengan un estado limpio independientemente de su uso anterior."}], "id": "CVE-2026-43303", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43303", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:16:18.326403Z", "version": "2.0.3"}}]}, "published": "2026-05-08T14:16:37.583", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/23b82b7a26182ad840ae67d390d7ec9771e8c00f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3edb8ebbf79b9016040e8f3421d723ae3d542b32"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ac1ea219590c09572ed5992dc233bbf7bb70fef9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d757c793853ec5483eb41ec2942c300b8fa720fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e7790ab165713b79b1617ce659742ceb3a859d05"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-457"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: mm/page_alloc: clear page->private in free_pages_prepare()", "id": "2468091", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468091"}, "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-909", "details": ["A flaw was found in the Linux kernel's memory management subsystem. When pages are freed, the page->private field is not properly cleared. If these pages are later reallocated as high-order pages and split, the tail pages can retain stale page->private values. This can lead to a use-after-free vulnerability in the swap subsystem, where incorrect assumptions about the page->private value can cause the system to crash."], "name": "CVE-2026-43303", "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": "Under investigation", "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": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43303\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43303\nhttps://lore.kernel.org/linux-cve-announce/2026050857-CVE-2026-43303-dc12@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3b8000ae185cb068adbda5f966a3835053c85fd4,23b82b7a26182ad840ae67d390d7ec9771e8c00f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3b8000ae185cb068adbda5f966a3835053c85fd4,d757c793853ec5483eb41ec2942c300b8fa720fb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3b8000ae185cb068adbda5f966a3835053c85fd4,ac1ea219590c09572ed5992dc233bbf7bb70fef9)"}}], "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": "5.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.16,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.6,6.20.0)"}}, {"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"}], "created": "2026-05-08T15:45:08.663705+00:00", "updated": "2026-10-23T01:45:14.608298+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-457", "CWE-909"]}