{"id":"DEBIAN-CVE-2022-49992","details":"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 \u003c0f\u003e 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:    \u003cTASK\u003e    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/","modified":"2026-09-01T20:04:56.951213688Z","published":"2025-06-18T11:15:26.870Z","upstream":["CVE-2022-49992"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49992"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49992.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49992.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.2-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49992.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}