{"cve":"CVE-2025-39731","nvd":{"published":"2025-09-07T16:15:48.547","modified":"2026-10-19T21:10:00.160","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: vm_unmap_ram() may be called from an invalid context\n\nWhen testing F2FS with xfstests using UFS backed virtual disks the\nkernel complains sometimes that f2fs_release_decomp_mem() calls\nvm_unmap_ram() from an invalid context. Example trace from\nf2fs/007 test:\n\nf2fs/007 5s ...  [12:59:38][    8.902525] run fstests f2fs/007\n[   11.468026] BUG: sleeping function called from invalid context at mm/vmalloc.c:2978\n[   11.471849] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 68, name: irq/22-ufshcd\n[   11.475357] preempt_count: 1, expected: 0\n[   11.476970] RCU nest depth: 0, expected: 0\n[   11.478531] CPU: 0 UID: 0 PID: 68 Comm: irq/22-ufshcd Tainted: G        W           6.16.0-rc5-xfstests-ufs-g40f92e79b0aa #9 PREEMPT(none)\n[   11.478535] Tainted: [W]=WARN\n[   11.478536] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   11.478537] Call Trace:\n[   11.478543]  <TASK>\n[   11.478545]  dump_stack_lvl+0x4e/0x70\n[   11.478554]  __might_resched.cold+0xaf/0xbe\n[   11.478557]  vm_unmap_ram+0x21/0xb0\n[   11.478560]  f2fs_release_decomp_mem+0x59/0x80\n[   11.478563]  f2fs_free_dic+0x18/0x1a0\n[   11.478565]  f2fs_finish_read_bio+0xd7/0x290\n[   11.478570]  blk_update_request+0xec/0x3b0\n[   11.478574]  ? sbitmap_queue_clear+0x3b/0x60\n[   11.478576]  scsi_end_request+0x27/0x1a0\n[   11.478582]  scsi_io_completion+0x40/0x300\n[   11.478583]  ufshcd_mcq_poll_cqe_lock+0xa3/0xe0\n[   11.478588]  ufshcd_sl_intr+0x194/0x1f0\n[   11.478592]  ufshcd_threaded_intr+0x68/0xb0\n[   11.478594]  ? __pfx_irq_thread_fn+0x10/0x10\n[   11.478599]  irq_thread_fn+0x20/0x60\n[   11.478602]  ? __pfx_irq_thread_fn+0x10/0x10\n[   11.478603]  irq_thread+0xb9/0x180\n[   11.478605]  ? __pfx_irq_thread_dtor+0x10/0x10\n[   11.478607]  ? __pfx_irq_thread+0x10/0x10\n[   11.478609]  kthread+0x10a/0x230\n[   11.478614]  ? __pfx_kthread+0x10/0x10\n[   11.478615]  ret_from_fork+0x7e/0xd0\n[   11.478619]  ? __pfx_kthread+0x10/0x10\n[   11.478621]  ret_from_fork_asm+0x1a/0x30\n[   11.478623]  </TASK>\n\nThis patch modifies in_task() check inside f2fs_read_end_io() to also\ncheck if interrupts are disabled. This ensures that pages are unmapped\nasynchronously in an interrupt handler.","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/08a7efc5b02a0620ae16aa9584060e980a69cb55","https://git.kernel.org/stable/c/0fe7976b62546f1e95eebfe9879925e9aa22b7a8","https://git.kernel.org/stable/c/1023836d1b9465593c8746f97d608da32958785f","https://git.kernel.org/stable/c/18eea36f4f460ead3750ed4afe5496f7ce55f99e","https://git.kernel.org/stable/c/411e00f44e2e1a7fdb526013b25a7f0ed22a0947"],"products":["debian:debian_linux","linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2025-39731","score":0.00149,"percentile":0.04021,"date":"2026-10-25"},"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."]}