ghsa-5mfc-rx34-wgrh
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
mm/mprotect: only reference swap pfn page if type match
Yu Zhao reported a bug after the commit "mm/swap: Add swp_offset_pfn() to fetch PFN from swap entry" added a check in swp_offset_pfn() for swap type [1]:
kernel BUG at include/linux/swapops.h:117! CPU: 46 PID: 5245 Comm: EventManager_De Tainted: G S O L 6.0.0-dbg-DEV #2 RIP: 0010:pfn_swap_entry_to_page+0x72/0xf0 Code: c6 48 8b 36 48 83 fe ff 74 53 48 01 d1 48 83 c1 08 48 8b 09 f6 c1 01 75 7b 66 90 48 89 c1 48 8b 09 f6 c1 01 74 74 5d c3 eb 9e <0f> 0b 48 ba ff ff ff ff 03 00 00 00 eb ae a9 ff 0f 00 00 75 13 48 RSP: 0018:ffffa59e73fabb80 EFLAGS: 00010282 RAX: 00000000ffffffe8 RBX: 0c00000000000000 RCX: ffffcd5440000000 RDX: 1ffffffffff7a80a RSI: 0000000000000000 RDI: 0c0000000000042b RBP: ffffa59e73fabb80 R08: ffff9965ca6e8bb8 R09: 0000000000000000 R10: ffffffffa5a2f62d R11: 0000030b372e9fff R12: ffff997b79db5738 R13: 000000000000042b R14: 0c0000000000042b R15: 1ffffffffff7a80a FS: 00007f549d1bb700(0000) GS:ffff99d3cf680000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000440d035b3180 CR3: 0000002243176004 CR4: 00000000003706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: change_pte_range+0x36e/0x880 change_p4d_range+0x2e8/0x670 change_protection_range+0x14e/0x2c0 mprotect_fixup+0x1ee/0x330 do_mprotect_pkey+0x34c/0x440 __x64_sys_mprotect+0x1d/0x30
It triggers because pfn_swap_entry_to_page() could be called upon e.g. a genuine swap entry.
Fix it by only calling it when it's a write migration entry where the page* is used.
[1] https://lore.kernel.org/lkml/CAOUHufaVC2Za-p8m0aiHw6YkheDcrO-C3wRGixwDS32VTS+k1w@mail.gmail.com/
{
"affected": [],
"aliases": [
"CVE-2022-49992"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-06-18T11:15:26Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mprotect: only reference swap pfn page if type match\n\nYu Zhao reported a bug after the commit \"mm/swap: Add swp_offset_pfn() to\nfetch PFN from swap entry\" added a check in swp_offset_pfn() for swap type [1]:\n\n kernel BUG at include/linux/swapops.h:117!\n CPU: 46 PID: 5245 Comm: EventManager_De Tainted: G S O L 6.0.0-dbg-DEV #2\n RIP: 0010:pfn_swap_entry_to_page+0x72/0xf0\n Code: c6 48 8b 36 48 83 fe ff 74 53 48 01 d1 48 83 c1 08 48 8b 09 f6\n c1 01 75 7b 66 90 48 89 c1 48 8b 09 f6 c1 01 74 74 5d c3 eb 9e \u003c0f\u003e 0b\n 48 ba ff ff ff ff 03 00 00 00 eb ae a9 ff 0f 00 00 75 13 48\n RSP: 0018:ffffa59e73fabb80 EFLAGS: 00010282\n RAX: 00000000ffffffe8 RBX: 0c00000000000000 RCX: ffffcd5440000000\n RDX: 1ffffffffff7a80a RSI: 0000000000000000 RDI: 0c0000000000042b\n RBP: ffffa59e73fabb80 R08: ffff9965ca6e8bb8 R09: 0000000000000000\n R10: ffffffffa5a2f62d R11: 0000030b372e9fff R12: ffff997b79db5738\n R13: 000000000000042b R14: 0c0000000000042b R15: 1ffffffffff7a80a\n FS: 00007f549d1bb700(0000) GS:ffff99d3cf680000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000440d035b3180 CR3: 0000002243176004 CR4: 00000000003706e0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n \u003cTASK\u003e\n change_pte_range+0x36e/0x880\n change_p4d_range+0x2e8/0x670\n change_protection_range+0x14e/0x2c0\n mprotect_fixup+0x1ee/0x330\n do_mprotect_pkey+0x34c/0x440\n __x64_sys_mprotect+0x1d/0x30\n\nIt triggers because pfn_swap_entry_to_page() could be called upon e.g. a\ngenuine swap entry.\n\nFix it by only calling it when it\u0027s a write migration entry where the page*\nis used.\n\n[1] https://lore.kernel.org/lkml/CAOUHufaVC2Za-p8m0aiHw6YkheDcrO-C3wRGixwDS32VTS+k1w@mail.gmail.com/",
"id": "GHSA-5mfc-rx34-wgrh",
"modified": "2025-06-18T12:30:40Z",
"published": "2025-06-18T12:30:40Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49992"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3d2f78f08cd8388035ac375e731ec1ac1b79b09d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5fcf81e308d1f4ae95f31690d2a80b7061385ff9"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
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