{"id":"CVE-2026-80697","summary":"erofs: ensure valid f_path for page cache sharing","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: ensure valid f_path for page cache sharing\n\nPreviously, backing files for page cache sharing were set up with\nf_path left as NULL (only f_inode was valid).  It worked, but a recent\nmincore fix relies on f_path.mnt and crashes (found by \"erofs/028\" on\n7.2-rc4):\n\n BUG: kernel NULL pointer dereference, address: 0000000000000018\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: Oops: 0000 [#1] SMP PTI\n CPU: 3 UID: 0 PID: 675528 Comm: fincore Not tainted 7.2.0-rc4-00002-g[]-dirty #1 PREEMPT(lazy)\n Hardware name: Red Hat KVM, BIOS 1.16.0-4.al8 04/01/2014\n RIP: 0010:__do_sys_mincore+0xc0/0x2c0\n ...\n\nSpecify valid paths using valid disconnected dentries together with\nerofs_ishare_mnt instead of leaving f_path empty, so they are more\nlike real backing files in a pseudo filesystem and standard\nbacking_file_open() can be used directly.","modified":"2026-08-30T03:48:21.196404277Z","published":"2026-08-28T06:53:02.236Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80697.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3879657c4ffd81b9a42cf575fc6cb60201032587"},{"type":"WEB","url":"https://git.kernel.org/stable/c/96b2dbbe58a1ea5df8d29c2fe24b5f04715f4443"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80697.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80697"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5ef3208e3be50aa08b4e7a2832f34e16d42c08b3"},{"fixed":"3879657c4ffd81b9a42cf575fc6cb60201032587"},{"fixed":"96b2dbbe58a1ea5df8d29c2fe24b5f04715f4443"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80697.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.0.0"},{"fixed":"7.1.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80697.json"}}],"schema_version":"1.9.0"}