CVE-2022-49081

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-49081", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T01:49:39.247Z", "datePublished": "2025-02-26T01:54:41.639Z", "dateUpdated": "2026-05-11T18:52:39.819Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T18:52:39.819Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhighmem: fix checks in __kmap_local_sched_{in,out}\n\nWhen CONFIG_DEBUG_KMAP_LOCAL is enabled __kmap_local_sched_{in,out} check\nthat even slots in the tsk->kmap_ctrl.pteval are unmapped. The slots are\ninitialized with 0 value, but the check is done with pte_none. 0 pte\nhowever does not necessarily mean that pte_none will return true. e.g.\non xtensa it returns false, resulting in the following runtime warnings:\n\n WARNING: CPU: 0 PID: 101 at mm/highmem.c:627 __kmap_local_sched_out+0x51/0x108\n CPU: 0 PID: 101 Comm: touch Not tainted 5.17.0-rc7-00010-gd3a1cdde80d2-dirty #13\n Call Trace:\n dump_stack+0xc/0x40\n __warn+0x8f/0x174\n warn_slowpath_fmt+0x48/0xac\n __kmap_local_sched_out+0x51/0x108\n __schedule+0x71a/0x9c4\n preempt_schedule_irq+0xa0/0xe0\n common_exception_return+0x5c/0x93\n do_wp_page+0x30e/0x330\n handle_mm_fault+0xa70/0xc3c\n do_page_fault+0x1d8/0x3c4\n common_exception+0x7f/0x7f\n\n WARNING: CPU: 0 PID: 101 at mm/highmem.c:664 __kmap_local_sched_in+0x50/0xe0\n CPU: 0 PID: 101 Comm: touch Tainted: G W 5.17.0-rc7-00010-gd3a1cdde80d2-dirty #13\n Call Trace:\n dump_stack+0xc/0x40\n __warn+0x8f/0x174\n warn_slowpath_fmt+0x48/0xac\n __kmap_local_sched_in+0x50/0xe0\n finish_task_switch$isra$0+0x1ce/0x2f8\n __schedule+0x86e/0x9c4\n preempt_schedule_irq+0xa0/0xe0\n common_exception_return+0x5c/0x93\n do_wp_page+0x30e/0x330\n handle_mm_fault+0xa70/0xc3c\n do_page_fault+0x1d8/0x3c4\n common_exception+0x7f/0x7f\n\nFix it by replacing !pte_none(pteval) with pte_val(pteval) != 0."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/highmem.c"], "versions": [{"version": "5fbda3ecd14a5343644979c98d6eb65b7e7de9d8", "lessThan": "c21d040de6225414547d9bd31cd200f290991c85", "status": "affected", "versionType": "git"}, {"version": "5fbda3ecd14a5343644979c98d6eb65b7e7de9d8", "lessThan": "85550b0f5fa5dd3c30469ea702c44444ef242c83", "status": "affected", "versionType": "git"}, {"version": "5fbda3ecd14a5343644979c98d6eb65b7e7de9d8", "lessThan": "7dd5b3b97716a611fcf67d92fd2370fcb8d50372", "status": "affected", "versionType": "git"}, {"version": "5fbda3ecd14a5343644979c98d6eb65b7e7de9d8", "lessThan": "66f133ceab7456c789f70a242991ed1b27ba1c3d", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/highmem.c"], "versions": [{"version": "5.11", "status": "affected"}, {"version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.34", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.16.20", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.17.3", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.18", "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": "5.11", "versionEndExcluding": "5.15.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.16.20"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.17.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c21d040de6225414547d9bd31cd200f290991c85"}, {"url": "https://git.kernel.org/stable/c/85550b0f5fa5dd3c30469ea702c44444ef242c83"}, {"url": "https://git.kernel.org/stable/c/7dd5b3b97716a611fcf67d92fd2370fcb8d50372"}, {"url": "https://git.kernel.org/stable/c/66f133ceab7456c789f70a242991ed1b27ba1c3d"}], "title": "highmem: fix checks in __kmap_local_sched_{in,out}", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["mm/highmem.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c21d040de6225414547d9bd31cd200f290991c85", "status": "affected", "version": "5fbda3ecd14a5343644979c98d6eb65b7e7de9d8", "versionType": "git"}, {"lessThan": "85550b0f5fa5dd3c30469ea702c44444ef242c83", "status": "affected", "version": "5fbda3ecd14a5343644979c98d6eb65b7e7de9d8", "versionType": "git"}, {"lessThan": "7dd5b3b97716a611fcf67d92fd2370fcb8d50372", "status": "affected", "version": "5fbda3ecd14a5343644979c98d6eb65b7e7de9d8", "versionType": "git"}, {"lessThan": "66f133ceab7456c789f70a242991ed1b27ba1c3d", "status": "affected", "version": "5fbda3ecd14a5343644979c98d6eb65b7e7de9d8", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["mm/highmem.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.11"}, {"lessThan": "5.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.34", "versionType": "semver"}, {"lessThanOrEqual": "5.16.*", "status": "unaffected", "version": "5.16.20", "versionType": "semver"}, {"lessThanOrEqual": "5.17.*", "status": "unaffected", "version": "5.17.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.18", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D25878D3-7761-4E9F-8919-E92CD53896E0", "versionEndExcluding": "5.15.34", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "ABBBA66E-0244-4621-966B-9790AF1EEB00", "versionEndExcluding": "5.16.20", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "AE420AC7-1E59-4398-B84F-71F4B4337762", "versionEndExcluding": "5.17.3", "versionStartIncluding": "5.17", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.18:rc1:*:*:*:*:*:*", "matchCriteriaId": "6AD94161-84BB-42E6-9882-4FC0C42E9FC1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhighmem: fix checks in __kmap_local_sched_{in,out}\n\nWhen CONFIG_DEBUG_KMAP_LOCAL is enabled __kmap_local_sched_{in,out} check\nthat even slots in the tsk->kmap_ctrl.pteval are unmapped. The slots are\ninitialized with 0 value, but the check is done with pte_none. 0 pte\nhowever does not necessarily mean that pte_none will return true. e.g.\non xtensa it returns false, resulting in the following runtime warnings:\n\n WARNING: CPU: 0 PID: 101 at mm/highmem.c:627 __kmap_local_sched_out+0x51/0x108\n CPU: 0 PID: 101 Comm: touch Not tainted 5.17.0-rc7-00010-gd3a1cdde80d2-dirty #13\n Call Trace:\n dump_stack+0xc/0x40\n __warn+0x8f/0x174\n warn_slowpath_fmt+0x48/0xac\n __kmap_local_sched_out+0x51/0x108\n __schedule+0x71a/0x9c4\n preempt_schedule_irq+0xa0/0xe0\n common_exception_return+0x5c/0x93\n do_wp_page+0x30e/0x330\n handle_mm_fault+0xa70/0xc3c\n do_page_fault+0x1d8/0x3c4\n common_exception+0x7f/0x7f\n\n WARNING: CPU: 0 PID: 101 at mm/highmem.c:664 __kmap_local_sched_in+0x50/0xe0\n CPU: 0 PID: 101 Comm: touch Tainted: G W 5.17.0-rc7-00010-gd3a1cdde80d2-dirty #13\n Call Trace:\n dump_stack+0xc/0x40\n __warn+0x8f/0x174\n warn_slowpath_fmt+0x48/0xac\n __kmap_local_sched_in+0x50/0xe0\n finish_task_switch$isra$0+0x1ce/0x2f8\n __schedule+0x86e/0x9c4\n preempt_schedule_irq+0xa0/0xe0\n common_exception_return+0x5c/0x93\n do_wp_page+0x30e/0x330\n handle_mm_fault+0xa70/0xc3c\n do_page_fault+0x1d8/0x3c4\n common_exception+0x7f/0x7f\n\nFix it by replacing !pte_none(pteval) with pte_val(pteval) != 0."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: highmem: se corrigen las comprobaciones en __kmap_local_sched_{in,out}. Cuando CONFIG_DEBUG_KMAP_LOCAL est\u00e1 habilitado, __kmap_local_sched_{in,out} comprueba que ni siquiera las ranuras en tsk->kmap_ctrl.pteval est\u00e9n asignadas. Las ranuras se inicializan con el valor 0, pero la comprobaci\u00f3n se realiza con pte_none. Sin embargo, 0 pte no significa necesariamente que pte_none devuelva verdadero. p. ej. en xtensa devuelve falso, lo que genera las siguientes advertencias de tiempo de ejecuci\u00f3n: ADVERTENCIA: CPU: 0 PID: 101 en mm/highmem.c:627 __kmap_local_sched_out+0x51/0x108 CPU: 0 PID: 101 Comm: touch No contaminado 5.17.0-rc7-00010-gd3a1cdde80d2-dirty #13 Seguimiento de llamadas: dump_stack+0xc/0x40 __warn+0x8f/0x174 warn_slowpath_fmt+0x48/0xac __kmap_local_sched_out+0x51/0x108 __schedule+0x71a/0x9c4 preempt_schedule_irq+0xa0/0xe0 common_exception_return+0x5c/0x93 do_wp_page+0x30e/0x330 handle_mm_fault+0xa70/0xc3c do_page_fault+0x1d8/0x3c4 common_exception+0x7f/0x7f ADVERTENCIA: CPU: 0 PID: 101 en mm/highmem.c:664 __kmap_local_sched_in+0x50/0xe0 CPU: 0 PID: 101 Comm: toque Contaminado: GW 5.17.0-rc7-00010-gd3a1cdde80d2-dirty #13 Seguimiento de llamadas: dump_stack+0xc/0x40 __warn+0x8f/0x174 warn_slowpath_fmt+0x48/0xac __kmap_local_sched_in+0x50/0xe0 Soluci\u00f3nelo reemplazando !pte_none(pteval) con pte_val(pteval) != 0."}], "id": "CVE-2022-49081", "lastModified": "2026-06-17T05:17:01.663", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-02-26T07:00:45.450", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/66f133ceab7456c789f70a242991ed1b27ba1c3d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7dd5b3b97716a611fcf67d92fd2370fcb8d50372"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/85550b0f5fa5dd3c30469ea702c44444ef242c83"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c21d040de6225414547d9bd31cd200f290991c85"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:3138", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-05-22T00:00:00Z"}, {"advisory": "RHSA-2023:2458", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-284.11.1.el9_2", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-05-09T00:00:00Z"}, {"advisory": "RHSA-2023:2458", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-284.11.1.el9_2", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-05-09T00:00:00Z"}], "bugzilla": {"description": "kernel: highmem: fix checks in __kmap_local_sched_{in,out}", "id": "2347739", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347739"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "status": "verified"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nhighmem: fix checks in __kmap_local_sched_{in,out}\nWhen CONFIG_DEBUG_KMAP_LOCAL is enabled __kmap_local_sched_{in,out} check\nthat even slots in the tsk->kmap_ctrl.pteval are unmapped. The slots are\ninitialized with 0 value, but the check is done with pte_none. 0 pte\nhowever does not necessarily mean that pte_none will return true. e.g.\non xtensa it returns false, resulting in the following runtime warnings:\nWARNING: CPU: 0 PID: 101 at mm/highmem.c:627 __kmap_local_sched_out+0x51/0x108\nCPU: 0 PID: 101 Comm: touch Not tainted 5.17.0-rc7-00010-gd3a1cdde80d2-dirty #13\nCall Trace:\ndump_stack+0xc/0x40\n__warn+0x8f/0x174\nwarn_slowpath_fmt+0x48/0xac\n__kmap_local_sched_out+0x51/0x108\n__schedule+0x71a/0x9c4\npreempt_schedule_irq+0xa0/0xe0\ncommon_exception_return+0x5c/0x93\ndo_wp_page+0x30e/0x330\nhandle_mm_fault+0xa70/0xc3c\ndo_page_fault+0x1d8/0x3c4\ncommon_exception+0x7f/0x7f\nWARNING: CPU: 0 PID: 101 at mm/highmem.c:664 __kmap_local_sched_in+0x50/0xe0\nCPU: 0 PID: 101 Comm: touch Tainted: G W 5.17.0-rc7-00010-gd3a1cdde80d2-dirty #13\nCall Trace:\ndump_stack+0xc/0x40\n__warn+0x8f/0x174\nwarn_slowpath_fmt+0x48/0xac\n__kmap_local_sched_in+0x50/0xe0\nfinish_task_switch$isra$0+0x1ce/0x2f8\n__schedule+0x86e/0x9c4\npreempt_schedule_irq+0xa0/0xe0\ncommon_exception_return+0x5c/0x93\ndo_wp_page+0x30e/0x330\nhandle_mm_fault+0xa70/0xc3c\ndo_page_fault+0x1d8/0x3c4\ncommon_exception+0x7f/0x7f\nFix it by replacing !pte_none(pteval) with pte_val(pteval) != 0."], "name": "CVE-2022-49081", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not 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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49081\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49081\nhttps://lore.kernel.org/linux-cve-announce/2025022657-CVE-2022-49081-7a0f@gregkh/T"], "threat_severity": "Low"}

{}