{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2025-38263", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-38263", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-07-09T10:42:37.990Z", "updatedAt": "2026-05-11T21:24:25.185Z", "importedAt": "2026-10-24T01:57:34.152Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "bcache: fix NULL pointer in cache_set_flush()", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbcache: fix NULL pointer in cache_set_flush()\n\n1. LINE#1794 - LINE#1887 is some codes about function of\n bch_cache_set_alloc().\n2. LINE#2078 - LINE#2142 is some codes about function of\n register_cache_set().\n3. register_cache_set() will call bch_cache_set_alloc() in LINE#2098.\n\n 1794 struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)\n 1795 {\n ...\n 1860 if (!(c->devices = kcalloc(c->nr_uuids, sizeof(void *), GFP_KERNEL)) ||\n 1861 mempool_init_slab_pool(&c->search, 32, bch_search_cache) ||\n 1862 mempool_init_kmalloc_pool(&c->bio_meta, 2,\n 1863 sizeof(struct bbio) + sizeof(struct bio_vec) *\n 1864 bucket_pages(c)) ||\n 1865 mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) ||\n 1866 bioset_init(&c->bio_split, 4, offsetof(struct bbio, bio),\n 1867 BIOSET_NEED_BVECS|BIOSET_NEED_RESCUER) ||\n 1868 !(c->uuids = alloc_bucket_pages(GFP_KERNEL, c)) ||\n 1869 !(c->moving_gc_wq = alloc_workqueue(\"bcache_gc\",\n 1870 WQ_MEM_RECLAIM, 0)) ||\n 1871 bch_journal_alloc(c) ||\n 1872 bch_btree_cache_alloc(c) ||\n 1873 bch_open_buckets_alloc(c) ||\n 1874 bch_bset_sort_state_init(&c->sort, ilog2(c->btree_pages)))\n 1875 goto err;\n ^^^^^^^^\n 1876\n ...\n 1883 return c;\n 1884 err:\n 1885 bch_cache_set_unregister(c);\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^\n 1886 return NULL;\n 1887 }\n ...\n 2078 static const char *register_cache_set(struct cache *ca)\n 2079 {\n ...\n 2098 c = bch_cache_set_alloc(&ca->sb);\n 2099 if (!c)\n 2100 return err;\n ^^^^^^^^^^\n ...\n 2128 ca->set = c;\n 2129 ca->set->cache[ca->sb.nr_this_dev] = ca;\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n ...\n 2138 return NULL;\n 2139 err:\n 2140 bch_cache_set_unregister(c);\n 2141 return err;\n 2142 }\n\n(1) If LINE#1860 - LINE#1874 is true, then do 'goto err'(LINE#1875) and\n call bch_cache_set_unregister()(LINE#1885).\n(2) As (1) return NULL(LINE#1886), LINE#2098 - LINE#2100 would return.\n(3) As (2) has returned, LINE#2128 - LINE#2129 would do *not* give the\n value to c->cache[], it means that c->cache[] is NULL.\n\nLINE#1624 - LINE#1665 is some codes about function of cache_set_flush().\nAs (1), in LINE#1885 call\nbch_cache_set_unregister()\n---> bch_cache_set_stop()\n ---> closure_queue()\n -.-> cache_set_flush() (as below LINE#1624)\n\n 1624 static void cache_set_flush(struct closure *cl)\n 1625 {\n ...\n 1654 for_each_cache(ca, c, i)\n 1655 if (ca->alloc_thread)\n ^^\n 1656 kthread_stop(ca->alloc_thread);\n ...\n 1665 }\n\n(4) In LINE#1655 ca is NULL(see (3)) in cache_set_flush() then the\n kernel crash occurred as below:\n[ 846.712887] bcache: register_cache() error drbd6: cannot allocate memory\n[ 846.713242] bcache: register_bcache() error : failed to register device\n[ 846.713336] bcache: cache_set_free() Cache set 2f84bdc1-498a-4f2f-98a7-01946bf54287 unregistered\n[ 846.713768] BUG: unable to handle kernel NULL pointer dereference at 00000000000009f8\n[ 846.714790] PGD 0 P4D 0\n[ 846.715129] Oops: 0000 [#1] SMP PTI\n[ 846.715472] CPU: 19 PID: 5057 Comm: kworker/19:16 Kdump: loaded Tainted: G OE --------- - - 4.18.0-147.5.1.el8_1.5es.3.x86_64 #1\n[ 846.716082] Hardware name: ESPAN GI-25212/X11DPL-i, BIOS 2.1 06/15/2018\n[ 846.716451] Workqueue: events cache_set_flush [bcache]\n[ 846.716808] RIP: 0010:cache_set_flush+0xc9/0x1b0 [bcache]\n[ 846.717155] Code: 00 4c 89 a5 b0 03 00 00 48 8b 85 68 f6 ff ff a8 08 0f 84 88 00 00 00 31 db 66 83 bd 3c f7 ff ff 00 48 8b 85 48 ff ff ff 74 28 <48> 8b b8 f8 09 00 0\n---truncated---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "status": "affected", "versionType": "git", "lessThan": "d54681938b777488e5dfb781b566d16adad991de" }, { "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "status": "affected", "versionType": "git", "lessThan": "1f25f2d3fa29325320c19a30abf787e0bd5fc91b" }, { "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "status": "affected", "versionType": "git", "lessThan": "c4f5e7e417034b05f5d2f5fa9a872db897da69bd" }, { "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "status": "affected", "versionType": "git", "lessThan": "553f560e0a74a7008ad9dba05c3fd05da296befb" }, { "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "status": "affected", "versionType": "git", "lessThan": "667c3f52373ff5354cb3543e27237eb7df7b2333" }, { "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "status": "affected", "versionType": "git", "lessThan": "3f9e128186c99a117e304f1dce6d0b9e50c63cd8" }, { "version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060", "status": "affected", "versionType": "git", "lessThan": "1e46ed947ec658f89f1a910d880cd05e42d3763e" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.10", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.10" }, { "version": "5.10.240", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.187", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.143", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.96", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.36", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.15.5", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.15.*" }, { "version": "6.16", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }