{"id":"CVE-2025-38102","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nVMCI: fix race between vmci_host_setup_notify and vmci_ctx_unset_notify\n\nDuring our test, it is found that a warning can be trigger in try_grab_folio\nas follow:\n\n  ----…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nVMCI: fix race between vmci_host_setup_notify and vmci_ctx_unset_notify\n\nDuring our test, it is found that a warning can be trigger in try_grab_folio\nas follow:\n\n  ----…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-362"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 4.0, < 5.4.296","linux_kernel >= 5.5, < 5.10.240","linux_kernel >= 5.11, < 5.15.186","linux_kernel >= 5.16, < 6.1.142","linux_kernel >= 6.2, < 6.6.94","linux_kernel >= 6.7, < 6.12.34","linux_kernel >= 6.13, < 6.15.3","debian_linux = 11.0"],"patched":["linux_kernel 6.15.3"],"published":"2025-07-03","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:18:26.937","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-38102","references":[{"url":"https://git.kernel.org/stable/c/00ddc7dad55b7bbb78df80d6e174d0c4764dea0c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1bd6406fb5f36c2bb1e96e27d4c3e9f4d09edde4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/468aec888f838ce5174b96e0cb4396790d6f60ca","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/58a90db70aa6616411e5f69d1982d9b1dd97d774","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6e3af836805ed1d7a699f76ec798626198917aa4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/74095bbbb19ca74a0368d857603a2438c88ca86c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/75b5313c80c39a26d27cbb602f968a05576c36f9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b4209e4b778e4e57d0636e1c9fc07a924dbc6043","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","cve.org"],"epss":0.00157,"epssPercentile":0.04811,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:47:24.069942Z"},"ingestedAt":"2026-10-15T22:48:25.492Z","slug":"CVE-2025-38102","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nVMCI: fix race between vmci_host_setup_notify and vmci_ctx_unset_notify\n\nDuring our test, it is found that a warning can be trigger in try_grab_folio\nas follow:\n\n  ------------[ cut here ]------------\n  WARNING: CPU: 0 PID: 1678 at mm/gup.c:147 try_grab_folio+0x106/0x130\n  Modules linked in:\n  CPU: 0 UID: 0 PID: 1678 Comm: syz.3.31 Not tainted 6.15.0-rc5 #163 PREEMPT(undef)\n  RIP: 0010:try_grab_folio+0x106/0x130\n  Call Trace:\n   <TASK>\n   follow_huge_pmd+0x240/0x8e0\n   follow_pmd_mask.constprop.0.isra.0+0x40b/0x5c0\n   follow_pud_mask.constprop.0.isra.0+0x14a/0x170\n   follow_page_mask+0x1c2/0x1f0\n   __get_user_pages+0x176/0x950\n   __gup_longterm_locked+0x15b/0x1060\n   ? gup_fast+0x120/0x1f0\n   gup_fast_fallback+0x17e/0x230\n   get_user_pages_fast+0x5f/0x80\n   vmci_host_unlocked_ioctl+0x21c/0xf80\n  RIP: 0033:0x54d2cd\n  ---[ end trace 0000000000000000 ]---\n\nDigging into the source, context->notify_page may init by get_user_pages_fast\nand can be seen in vmci_ctx_unset_notify which will try to put_page. However\nget_user_pages_fast is not finished here and lead to following\ntry_grab_folio warning. The race condition is shown as follow:\n\ncpu0\t\t\tcpu1\nvmci_host_do_set_notify\nvmci_host_setup_notify\nget_user_pages_fast(uva, 1, FOLL_WRITE, &context->notify_page);\nlockless_pages_from_mm\ngup_pgd_range\ngup_huge_pmd  // update &context->notify_page\n\t\t\tvmci_host_do_set_notify\n\t\t\tvmci_ctx_unset_notify\n\t\t\tnotify_page = context->notify_page;\n\t\t\tif (notify_page)\n\t\t\tput_page(notify_page);\t// page is freed\n__gup_longterm_locked\n__get_user_pages\nfollow_trans_huge_pmd\ntry_grab_folio // warn here\n\nTo slove this, use local variable page to make notify_page can be seen\nafter finish get_user_pages_fast.\n\n## Affected\n\n- `linux_kernel >= 4.0, < 5.4.296`\n- `linux_kernel >= 5.5, < 5.10.240`\n- `linux_kernel >= 5.11, < 5.15.186`\n- `linux_kernel >= 5.16, < 6.1.142`\n- `linux_kernel >= 6.2, < 6.6.94`\n- `linux_kernel >= 6.7, < 6.12.34`\n- `linux_kernel >= 6.13, < 6.15.3`\n- `debian_linux = 11.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.15.3`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}