{ "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-2022-49067", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-49067", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-02-26T01:54:34.862Z", "updatedAt": "2026-05-11T18:52:23.386Z", "importedAt": "2026-10-24T01:56:49.724Z", "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": "powerpc: Fix virt_addr_valid() for 64-bit Book3E & 32-bit", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc: Fix virt_addr_valid() for 64-bit Book3E & 32-bit\n\nmpe: On 64-bit Book3E vmalloc space starts at 0x8000000000000000.\n\nBecause of the way __pa() works we have:\n __pa(0x8000000000000000) == 0, and therefore\n virt_to_pfn(0x8000000000000000) == 0, and therefore\n virt_addr_valid(0x8000000000000000) == true\n\nWhich is wrong, virt_addr_valid() should be false for vmalloc space.\nIn fact all vmalloc addresses that alias with a valid PFN will return\ntrue from virt_addr_valid(). That can cause bugs with hardened usercopy\nas described below by Kefeng Wang:\n\n When running ethtool eth0 on 64-bit Book3E, a BUG occurred:\n\n usercopy: Kernel memory exposure attempt detected from SLUB object not in SLUB page?! (offset 0, size 1048)!\n kernel BUG at mm/usercopy.c:99\n ...\n usercopy_abort+0x64/0xa0 (unreliable)\n __check_heap_object+0x168/0x190\n __check_object_size+0x1a0/0x200\n dev_ethtool+0x2494/0x2b20\n dev_ioctl+0x5d0/0x770\n sock_do_ioctl+0xf0/0x1d0\n sock_ioctl+0x3ec/0x5a0\n __se_sys_ioctl+0xf0/0x160\n system_call_exception+0xfc/0x1f0\n system_call_common+0xf8/0x200\n\n The code shows below,\n\n data = vzalloc(array_size(gstrings.len, ETH_GSTRING_LEN));\n copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))\n\n The data is alloced by vmalloc(), virt_addr_valid(ptr) will return true\n on 64-bit Book3E, which leads to the panic.\n\n As commit 4dd7554a6456 (\"powerpc/64: Add VIRTUAL_BUG_ON checks for __va\n and __pa addresses\") does, make sure the virt addr above PAGE_OFFSET in\n the virt_addr_valid() for 64-bit, also add upper limit check to make\n sure the virt is below high_memory.\n\n Meanwhile, for 32-bit PAGE_OFFSET is the virtual address of the start\n of lowmem, high_memory is the upper low virtual address, the check is\n suitable for 32-bit, this will fix the issue mentioned in commit\n 602946ec2f90 (\"powerpc: Set max_mapnr correctly\") too.\n\nOn 32-bit there is a similar problem with high memory, that was fixed in\ncommit 602946ec2f90 (\"powerpc: Set max_mapnr correctly\"), but that\ncommit breaks highmem and needs to be reverted.\n\nWe can't easily fix __pa(), we have code that relies on its current\nbehaviour. So for now add extra checks to virt_addr_valid().\n\nFor 64-bit Book3S the extra checks are not necessary, the combination of\nvirt_to_pfn() and pfn_valid() should yield the correct result, but they\nare harmless.\n\n[mpe: Add additional change log detail]", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "ffda09a9941c18d9f08d1176d55588d505f62912", "status": "affected", "versionType": "git", "lessThan": "deab81144d5a043f42804207fb76cfbd8a806978" }, { "version": "ffda09a9941c18d9f08d1176d55588d505f62912", "status": "affected", "versionType": "git", "lessThan": "d36febbcd537fcc50284e8b89609632d0146529f" }, { "version": "ffda09a9941c18d9f08d1176d55588d505f62912", "status": "affected", "versionType": "git", "lessThan": "fddb88bd266f4513abab7c36bca98935c9148a98" }, { "version": "ffda09a9941c18d9f08d1176d55588d505f62912", "status": "affected", "versionType": "git", "lessThan": "a3727c25eacd7e437c4f560957fa3a376fe93e6b" }, { "version": "ffda09a9941c18d9f08d1176d55588d505f62912", "status": "affected", "versionType": "git", "lessThan": "cbc065efcba000ad8f615f506ebe61b6d3c5145b" }, { "version": "ffda09a9941c18d9f08d1176d55588d505f62912", "status": "affected", "versionType": "git", "lessThan": "ffa0b64e3be58519ae472ea29a1a1ad681e32f48" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.4", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.4" }, { "version": "5.4.190", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.111", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.34", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "5.16.20", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.16.*" }, { "version": "5.17.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.17.*" }, { "version": "5.18", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }