{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49511", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.587Z", "datePublished": "2025-02-26T02:13:41.433Z", "dateUpdated": "2026-08-05T08:55:24.670Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:55:24.670Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: defio: fix the pagelist corruption\n\nEasily hit the below list corruption:\n==\nlist_add corruption. prev->next should be next (ffffffffc0ceb090), but\nwas ffffec604507edc8. (prev=ffffec604507edc8).\nWARNING: CPU: 65 PID: 3959 at lib/list_debug.c:26\n__list_add_valid+0x53/0x80\nCPU: 65 PID: 3959 Comm: fbdev Tainted: G U\nRIP: 0010:__list_add_valid+0x53/0x80\nCall Trace:\n \n fb_deferred_io_mkwrite+0xea/0x150\n do_page_mkwrite+0x57/0xc0\n do_wp_page+0x278/0x2f0\n __handle_mm_fault+0xdc2/0x1590\n handle_mm_fault+0xdd/0x2c0\n do_user_addr_fault+0x1d3/0x650\n exc_page_fault+0x77/0x180\n ? asm_exc_page_fault+0x8/0x30\n asm_exc_page_fault+0x1e/0x30\nRIP: 0033:0x7fd98fc8fad1\n==\n\nFigure out the race happens when one process is adding &page->lru into\nthe pagelist tail in fb_deferred_io_mkwrite(), another process is\nre-initializing the same &page->lru in fb_deferred_io_fault(), which is\nnot protected by the lock.\n\nThis fix is to init all the page lists one time during initialization,\nit not only fixes the list corruption, but also avoids INIT_LIST_HEAD()\nredundantly.\n\nV2: change \"int i\" to \"unsigned int i\" (Geert Uytterhoeven)" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached by opening and mmap'ing a framebuffer device (/dev/fb*), then triggering page faults and page_mkwrite through local memory writes; it is not reachable via network packets or protocols.\nAC:L - The race is between fb_deferred_io_fault() (unlocked INIT_LIST_HEAD on page->lru) and fb_deferred_io_mkwrite() (list_add under lock); the attacker controls both sides via concurrent mappings/processes and the commit notes it is easily hit.\nPR:L - fb_open() has no capability check; access is only gated by /dev/fb* permissions (typically root:video 0660), which unprivileged local users in the video group or with session uaccess can obtain.\nUI:N - The attacker triggers the race themselves by mmap'ing and writing the framebuffer; no separate victim action is required.\nS:U - Corruption occurs in the local kernel's deferred-I/O pagelist and can escalate privileges within the same OS security authority, not across VM/host or IOMMU boundaries.\nC:H - INIT_LIST_HEAD on an enlisted page->lru corrupts kernel list pointers, a classic memory-corruption primitive that can be leveraged for arbitrary kernel reads.\nI:H - The same list corruption enables use-after-free and write primitives when subsequent list_add/list_del/workqueue walks continue on the corrupted pagelist, allowing control-flow hijacking.\nA:H - The observed failure is kernel list_add corruption leading to WARN/oops, and corrupted list walks can panic or hang the kernel even without full exploitation." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/video/fbdev/core/fb_defio.c" ], "versions": [ { "version": "5d3aff76a3165087b0f897c0d677dfa987d9875d", "lessThan": "e79b2b2aadeffe1db54a6b569b9b621575c3eb07", "status": "affected", "versionType": "git" }, { "version": "105a940416fc622406653b6fe54732897642dfbc", "lessThan": "6a9ae2fe887042f76fd3d334349e64e8ab3c55a2", "status": "affected", "versionType": "git" }, { "version": "105a940416fc622406653b6fe54732897642dfbc", "lessThan": "856082f021a28221db2c32bd0531614a8382be67", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/video/fbdev/core/fb_defio.c" ], "versions": [ { "version": "5.18", "status": "affected" }, { "version": "0", "lessThan": "5.18", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.3", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19", "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": "5.18", "versionEndExcluding": "5.18.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "5.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e79b2b2aadeffe1db54a6b569b9b621575c3eb07" }, { "url": "https://git.kernel.org/stable/c/6a9ae2fe887042f76fd3d334349e64e8ab3c55a2" }, { "url": "https://git.kernel.org/stable/c/856082f021a28221db2c32bd0531614a8382be67" } ], "title": "fbdev: defio: fix the pagelist corruption", "x_generator": { "engine": "bippy-1.2.0" } } } }