{"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 <TASK>\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"}}}}