{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-30T20:13:05.559","vulnerabilities":[{"cve":{"id":"CVE-2025-37999","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2025-05-29T14:15:36.597","lastModified":"2025-11-14T16:48:01.300","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/erofs/fileio: call erofs_onlinefolio_split() after bio_add_folio()\n\nIf bio_add_folio() fails (because it is full),\nerofs_fileio_scan_folio() needs to submit the I/O request via\nerofs_fileio_rq_submit() and allocate a new I/O request with an empty\n`struct bio`.  Then it retries the bio_add_folio() call.\n\nHowever, at this point, erofs_onlinefolio_split() has already been\ncalled which increments `folio->private`; the retry will call\nerofs_onlinefolio_split() again, but there will never be a matching\nerofs_onlinefolio_end() call.  This leaves the folio locked forever\nand all waiters will be stuck in folio_wait_bit_common().\n\nThis bug has been added by commit ce63cb62d794 (\"erofs: support\nunencoded inodes for fileio\"), but was practically unreachable because\nthere was room for 256 folios in the `struct bio` - until commit\n9f74ae8c9ac9 (\"erofs: shorten bvecs[] for file-backed mounts\") which\nreduced the array capacity to 16 folios.\n\nIt was now trivial to trigger the bug by manually invoking readahead\nfrom userspace, e.g.:\n\n posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED);\n\nThis should be fixed by invoking erofs_onlinefolio_split() only after\nbio_add_folio() has succeeded.  This is safe: asynchronous completions\ninvoking erofs_onlinefolio_end() will not unlock the folio because\nerofs_fileio_scan_folio() is still holding a reference to be released\nby erofs_onlinefolio_end() at the end."},{"lang":"es","value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs/erofs/fileio: llamar a erofs_onlinefolio_split() después de bio_add_folio(). Si bio_add_folio() falla (porque está lleno), erofs_fileio_scan_folio() debe enviar la solicitud de E/S mediante erofs_fileio_rq_submit() y asignar una nueva solicitud de E/S con un `struct bio` vacío. Luego, vuelve a intentar la llamada a bio_add_folio(). Sin embargo, en este punto, ya se ha llamado a erofs_onlinefolio_split(), lo que incrementa `folio->private`; el reintento llamará a erofs_onlinefolio_split() de nuevo, pero nunca habrá una llamada erofs_onlinefolio_end() coincidente. Esto deja el folio bloqueado para siempre y todos los que esperan quedarán atascados en folio_wait_bit_common(). Este error se añadió con el commit ce63cb62d794 (\"erofs: compatibilidad con inodos no codificados para fileio\"), pero era prácticamente imposible de solucionar porque había espacio para 256 folios en la estructura `struct bio`, hasta el commit 9f74ae8c9ac9 (\"erofs: acortar bvecs[] para montajes con respaldo de archivo\"), que redujo la capacidad del array a 16 folios. Ahora era fácil activar el error invocando manualmente la lectura anticipada desde el espacio de usuario, por ejemplo: posix_fadvise(fd, 0, st.st_size, POSIX_FADV_WILLNEED); Esto debería solucionarse invocando erofs_onlinefolio_split() solo después de que bio_add_folio() se haya ejecutado correctamente. Esto es seguro: las finalizaciones asincrónicas que invocan erofs_onlinefolio_end() no desbloquearán el folio porque erofs_fileio_scan_folio() todavía contiene una referencia que erofs_onlinefolio_end() liberará al final."}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"NVD-CWE-noinfo"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.12.29","matchCriteriaId":"69281F47-5478-4C16-818E-9DAC6D962CB6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.14.7","matchCriteriaId":"5715A6F5-A34A-4B27-8A64-82825E963995"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*","matchCriteriaId":"8D465631-2980-487A-8E65-40AE2B9F8ED1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*","matchCriteriaId":"4C9D071F-B28E-46EC-AC61-22B913390211"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*","matchCriteriaId":"13FC0DDE-E513-465E-9E81-515702D49B74"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*","matchCriteriaId":"8C7B5B0E-4EEB-48F5-B4CF-0935A7633845"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.15:rc5:*:*:*:*:*:*","matchCriteriaId":"2D240580-3048-49B2-9E27-F115A9DF8224"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/61e0fc3312309867e5a3495329dad0286d2a5703","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/bbfe756dc3062c1e934f06e5ba39c239aa953b92","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/c26076197df348c84cc23e5962d61902e072a0f5","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]}]}}]}