{"id":"CVE-2026-43303","aliases":[],"cve":{"records":[{"id":"CVE-2026-43303","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-05-01T14:12:56.000Z","published":"2026-05-08T13:11:23.561Z","modified":"2026-11-10T12:46:40.101Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-08-05T12:27:08.856Z"},{"name":"siemens-SADP","role":"ADP","organizationId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","modified":"2026-11-10T12:46:40.101Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-19T19:16:26.022Z"}],"references":[{"url":"https://git.kernel.org/stable/c/e7790ab165713b79b1617ce659742ceb3a859d05","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/3edb8ebbf79b9016040e8f3421d723ae3d542b32","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/23b82b7a26182ad840ae67d390d7ec9771e8c00f","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/d757c793853ec5483eb41ec2942c300b8fa720fb","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/ac1ea219590c09572ed5992dc233bbf7bb70fef9","tags":[],"source":"Linux"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","tags":[],"source":"siemens-SADP"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","tags":[],"source":"siemens-SADP"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html","tags":[],"source":"siemens-SADP"}],"weaknesses":[{"id":"CWE-457","description":"CWE-457 Use of Uninitialized Variable","source":"CISA-ADP"}],"applicability":[{"source":"Linux","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.12.93"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.18.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.19.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"7.0"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-16T15:16:18.326403Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"total"}]}]},"title":"mm/page_alloc: clear page->private in free_pages_prepare()","titleSource":"Linux","descriptionSource":"Linux","description":"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.","score":7.8,"severity":"high","published":"2026-05-08T13:11:23.561Z","modified":"2026-11-10T12:46:40.101Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"3b8000ae185cb068adbda5f966a3835053c85fd4","status":"affected","lessThan":"e7790ab165713b79b1617ce659742ceb3a859d05","versionType":"git"},{"version":"3b8000ae185cb068adbda5f966a3835053c85fd4","status":"affected","lessThan":"3edb8ebbf79b9016040e8f3421d723ae3d542b32","versionType":"git"},{"version":"3b8000ae185cb068adbda5f966a3835053c85fd4","status":"affected","lessThan":"f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b","versionType":"git"},{"version":"3b8000ae185cb068adbda5f966a3835053c85fd4","status":"affected","lessThan":"23b82b7a26182ad840ae67d390d7ec9771e8c00f","versionType":"git"},{"version":"3b8000ae185cb068adbda5f966a3835053c85fd4","status":"affected","lessThan":"d757c793853ec5483eb41ec2942c300b8fa720fb","versionType":"git"},{"version":"3b8000ae185cb068adbda5f966a3835053c85fd4","status":"affected","lessThan":"ac1ea219590c09572ed5992dc233bbf7bb70fef9","versionType":"git"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"5.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.18","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"},{"vendor":"Siemens","name":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)","platforms":[],"versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown","cpes":[],"source":"siemens-SADP","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"},{"vendor":"Siemens","name":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)","platforms":[],"versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown","cpes":[],"source":"siemens-SADP","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"},{"vendor":"Siemens","name":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)","platforms":[],"versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown","cpes":[],"source":"siemens-SADP","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"},{"vendor":"Siemens","name":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)","platforms":[],"versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown","cpes":[],"source":"siemens-SADP","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"},{"vendor":"Siemens","name":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)","platforms":[],"versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown","cpes":[],"source":"siemens-SADP","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"},{"vendor":"Siemens","name":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)","platforms":[],"versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown","cpes":[],"source":"siemens-SADP","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"},{"vendor":"Siemens","name":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)","platforms":[],"versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown","cpes":[],"source":"siemens-SADP","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"},{"vendor":"Siemens","name":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)","platforms":[],"versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown","cpes":[],"source":"siemens-SADP","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"},{"vendor":"Siemens","name":"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown","cpes":[],"source":"siemens-SADP","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"},{"vendor":"Siemens","name":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)","platforms":[],"versions":[{"version":"V3.1.6","status":"affected","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown","cpes":[],"source":"siemens-SADP","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"},{"vendor":"Siemens","name":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)","platforms":[],"versions":[{"version":"V3.1.7","status":"affected","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown","cpes":[],"source":"siemens-SADP","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"}],"remediation":[],"references":["https://git.kernel.org/stable/c/e7790ab165713b79b1617ce659742ceb3a859d05","https://git.kernel.org/stable/c/3edb8ebbf79b9016040e8f3421d723ae3d542b32","https://git.kernel.org/stable/c/f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b","https://git.kernel.org/stable/c/23b82b7a26182ad840ae67d390d7ec9771e8c00f","https://git.kernel.org/stable/c/d757c793853ec5483eb41ec2942c300b8fa720fb","https://git.kernel.org/stable/c/ac1ea219590c09572ed5992dc233bbf7bb70fef9","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html","https://cert-portal.siemens.com/productcert/html/ssa-784472.html"],"sources":[{"name":"CVE","id":"CVE-2026-43303","modified":"2026-11-10T12:46:40.101Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-43303"}],"assessments":[{"source":"Linux","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8}],"sourceAffected":[],"observedAt":"2026-11-10T12:53:46.362Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T02:30:32.029Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":null}