{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38100", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.985Z", "datePublished": "2025-07-03T08:35:09.487Z", "dateUpdated": "2026-07-14T12:41:28.496Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:21:15.733Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/iopl: Cure TIF_IO_BITMAP inconsistencies\n\nio_bitmap_exit() is invoked from exit_thread() when a task exists or\nwhen a fork fails. In the latter case the exit_thread() cleans up\nresources which were allocated during fork().\n\nio_bitmap_exit() invokes task_update_io_bitmap(), which in turn ends up\nin tss_update_io_bitmap(). tss_update_io_bitmap() operates on the\ncurrent task. If current has TIF_IO_BITMAP set, but no bitmap installed,\ntss_update_io_bitmap() crashes with a NULL pointer dereference.\n\nThere are two issues, which lead to that problem:\n\n 1) io_bitmap_exit() should not invoke task_update_io_bitmap() when\n the task, which is cleaned up, is not the current task. That's a\n clear indicator for a cleanup after a failed fork().\n\n 2) A task should not have TIF_IO_BITMAP set and neither a bitmap\n installed nor IOPL emulation level 3 activated.\n\n This happens when a kernel thread is created in the context of\n a user space thread, which has TIF_IO_BITMAP set as the thread\n flags are copied and the IO bitmap pointer is cleared.\n\n Other than in the failed fork() case this has no impact because\n kernel threads including IO workers never return to user space and\n therefore never invoke tss_update_io_bitmap().\n\nCure this by adding the missing cleanups and checks:\n\n 1) Prevent io_bitmap_exit() to invoke task_update_io_bitmap() if\n the to be cleaned up task is not the current task.\n\n 2) Clear TIF_IO_BITMAP in copy_thread() unconditionally. For user\n space forks it is set later, when the IO bitmap is inherited in\n io_bitmap_share().\n\nFor paranoia sake, add a warning into tss_update_io_bitmap() to catch\nthe case, when that code is invoked with inconsistent state." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/x86/kernel/ioport.c", "arch/x86/kernel/process.c" ], "versions": [ { "version": "ea5f1cd7ab494f65f50f338299eabb40ad6a1767", "lessThan": "d64b7b05a827f98d068f412969eef65489b0cf03", "status": "affected", "versionType": "git" }, { "version": "ea5f1cd7ab494f65f50f338299eabb40ad6a1767", "lessThan": "2dace5e016c991424a3dc6e83b1ae5dca8992d08", "status": "affected", "versionType": "git" }, { "version": "ea5f1cd7ab494f65f50f338299eabb40ad6a1767", "lessThan": "aa5ce1485562f20235b4c759eee5ab0c41d2c220", "status": "affected", "versionType": "git" }, { "version": "ea5f1cd7ab494f65f50f338299eabb40ad6a1767", "lessThan": "2cfcbe1554c119402e7382de974c26b0549899fe", "status": "affected", "versionType": "git" }, { "version": "ea5f1cd7ab494f65f50f338299eabb40ad6a1767", "lessThan": "b3b3b6366dc8eb5b22edba9adc4bff3cdacfd64c", "status": "affected", "versionType": "git" }, { "version": "ea5f1cd7ab494f65f50f338299eabb40ad6a1767", "lessThan": "73cfcc8445585b8af7e18be3c9246b851fdf336c", "status": "affected", "versionType": "git" }, { "version": "ea5f1cd7ab494f65f50f338299eabb40ad6a1767", "lessThan": "8b68e978718f14fdcb080c2a7791c52a0d09bc6d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/x86/kernel/ioport.c", "arch/x86/kernel/process.c" ], "versions": [ { "version": "5.5", "status": "affected" }, { "version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.239", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.186", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.142", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.94", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.34", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.3", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "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": "5.5", "versionEndExcluding": "5.10.239" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.15.186" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.1.142" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.6.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.12.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.15.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d64b7b05a827f98d068f412969eef65489b0cf03" }, { "url": "https://git.kernel.org/stable/c/2dace5e016c991424a3dc6e83b1ae5dca8992d08" }, { "url": "https://git.kernel.org/stable/c/aa5ce1485562f20235b4c759eee5ab0c41d2c220" }, { "url": "https://git.kernel.org/stable/c/2cfcbe1554c119402e7382de974c26b0549899fe" }, { "url": "https://git.kernel.org/stable/c/b3b3b6366dc8eb5b22edba9adc4bff3cdacfd64c" }, { "url": "https://git.kernel.org/stable/c/73cfcc8445585b8af7e18be3c9246b851fdf336c" }, { "url": "https://git.kernel.org/stable/c/8b68e978718f14fdcb080c2a7791c52a0d09bc6d" } ], "title": "x86/iopl: Cure TIF_IO_BITMAP inconsistencies", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:34:04.011Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:41:28.496Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html" } ] } ] } }