{"schema":"threatline.record/2","record":{"id":"CVE-2026-98920","aliases":[],"summary":"netfs: Fix missing alloc tagging of direct mempool allocations","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix missing alloc tagging of direct mempool allocations\n\nCommit 1d78d56c43ef (\"netfs: Fix folio_queue ENOMEM in writeback by\nadding a mempool\") added a mempool for the folio_queues and made the\nrequest, subrequest and folio_queue allocations distinguish between\nwriteback and everything else.  Writeback is part of memory reclaim\nand must not fail due to ENOMEM, so it allocates under GFP_NOFS\nthrough mempool_alloc(), which may dip into the pool's reserve and,\nif that runs empty, wait for elements to be returned.  The\nGFP_KERNEL paths, which can return -ENOMEM to their callers, invoke\nthe pool's ->alloc() callback directly instead.\n\nThe direct call, however, skips the alloc_hooks() wrapper that the\nmempool_alloc() macro provides.  The pool callbacks, mempool_alloc_slab()\nand mempool_kmalloc(), call kmem_cache_alloc_noprof() and kmalloc_noprof()\nand rely on current->alloc_tag having been set by the caller.  With\nCONFIG_MEM_ALLOC_PROFILING_DEBUG=y this leads to\n\n    current->alloc_tag not set\n    WARNING: ./include/linux/alloc_tag.h:161 at __alloc_tagging_slab_alloc_hook\n    alloc_tag was not set\n    WARNING: ./include/linux/alloc_tag.h:166 at __alloc_tagging_slab_free_hook\n\nat allocation and free time respectively, as reported when reading\nfiles on a CIFS mount.  The allocations are also missing from\n/proc/allocinfo.\n\nWrap the direct ->alloc() invocations in alloc_hooks() with a new\nmempool_alloc_noreserve() helper in include/linux/mempool.h, next to\nthe other alloc_hooks()-wrapped macros such as mempool_alloc().  The\nGFP_KERNEL paths keep their failable allocation semantics, they just\nget tagged now.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98920","source_modified_at":"2026-10-23T12:05:25.919Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"15ed8a9b7c63e9171f5139a6aaa1ffb61809861f","lessThan":"5c03da745171485fd181f17b69213464f6d05f3d","status":"affected","versionType":"git"},{"version":"1d78d56c43ef3768183e8370e7367b162700e049","lessThan":"37a2042748bc880df03ff8315db86ed82991fbb8","status":"affected","versionType":"git"},{"version":"1d78d56c43ef3768183e8370e7367b162700e049","lessThan":"b78b728e21c32ec4c330b299f657fb1eb02dffc2","status":"affected","versionType":"git"},{"version":"b343252d6f536203dd0660f676190dcbf6d2ecdc","status":"affected","versionType":"git"},{"version":"3f6d7f8a5416d852648d15a05e895f1195ee8a85","status":"affected","versionType":"git"},{"version":"6.12.114","lessThan":"6.13","status":"affected","versionType":"semver"},{"version":"7.1.8","lessThan":"7.2","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98920","source_modified_at":"2026-10-23T12:05:25.919Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"7.2","status":"affected"},{"version":"0","lessThan":"7.2","status":"unaffected","versionType":"semver"},{"version":"7.2.9","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98920","source_modified_at":"2026-10-23T12:05:25.919Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"5c03da745171485fd181f17b69213464f6d05f3d","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98920","source_modified_at":"2026-10-23T12:05:25.919Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"37a2042748bc880df03ff8315db86ed82991fbb8","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98920","source_modified_at":"2026-10-23T12:05:25.919Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"6.13","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98920","source_modified_at":"2026-10-23T12:05:25.919Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"7.2","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-23T12:02:06.560Z","modified_at":"2026-10-23T12:05:25.919Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98920","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T12:05:25.919Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/5c03da745171485fd181f17b69213464f6d05f3d"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/37a2042748bc880df03ff8315db86ed82991fbb8"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/b78b728e21c32ec4c330b299f657fb1eb02dffc2"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-23T12:05:25.919Z","content_hash":"6ccd73bfda3156f3300ee73fc8fb1535856b519224e73e98be930bd8a7da3b11"}}