{"cve":"CVE-2023-52582","nvd":{"published":"2024-03-02T22:15:49.770","modified":"2026-06-17T06:43:04.760","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Only call folio_start_fscache() one time for each folio\n\nIf a network filesystem using netfs implements a clamp_length()\nfunction, it can set subrequest lengths smaller than a page size.\n\nWhen we loop through the folios in netfs_rreq_unlock_folios() to\nset any folios to be written back, we need to make sure we only\ncall folio_start_fscache() once for each folio.\n\nOtherwise, this simple testcase:\n\n  mount -o fsc,rsize=1024,wsize=1024 127.0.0.1:/export /mnt/nfs\n  dd if=/dev/zero of=/mnt/nfs/file.bin bs=4096 count=1\n  1+0 records in\n  1+0 records out\n  4096 bytes (4.1 kB, 4.0 KiB) copied, 0.0126359 s, 324 kB/s\n  echo 3 > /proc/sys/vm/drop_caches\n  cat /mnt/nfs/file.bin > /dev/null\n\nwill trigger an oops similar to the following:\n\n  page dumped because: VM_BUG_ON_FOLIO(folio_test_private_2(folio))\n  ------------[ cut here ]------------\n  kernel BUG at include/linux/netfs.h:44!\n  ...\n  CPU: 5 PID: 134 Comm: kworker/u16:5 Kdump: loaded Not tainted 6.4.0-rc5\n  ...\n  RIP: 0010:netfs_rreq_unlock_folios+0x68e/0x730 [netfs]\n  ...\n  Call Trace:\n    netfs_rreq_assess+0x497/0x660 [netfs]\n    netfs_subreq_terminated+0x32b/0x610 [netfs]\n    nfs_netfs_read_completion+0x14e/0x1a0 [nfs]\n    nfs_read_completion+0x2f9/0x330 [nfs]\n    rpc_free_task+0x72/0xa0 [sunrpc]\n    rpc_async_release+0x46/0x70 [sunrpc]\n    process_one_work+0x3bd/0x710\n    worker_thread+0x89/0x610\n    kthread+0x181/0x1c0\n    ret_from_fork+0x29/0x50","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/d9f5537479d4ec97ea92ff24e81a517d5772581a","https://git.kernel.org/stable/c/df1c357f25d808e30b216188330e708e09e1a412","https://git.kernel.org/stable/c/df9950d37df113db59495fa09d060754366a2b7c","https://git.kernel.org/stable/c/d9f5537479d4ec97ea92ff24e81a517d5772581a","https://git.kernel.org/stable/c/df1c357f25d808e30b216188330e708e09e1a412"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:46:54.846886191+00:00"},"epss":{"cve":"CVE-2023-52582","score":0.00227,"percentile":0.13462,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}