{ "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-2026-43071", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-43071", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-05-05T15:29:28.081Z", "updatedAt": "2026-10-19T19:06:12.548Z", "importedAt": "2026-10-24T01:58:08.712Z", "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": "dcache: Limit the minimal number of bucket to two", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ndcache: Limit the minimal number of bucket to two\n\nThere is an OOB read problem on dentry_hashtable when user sets\n'dhash_entries=1':\n BUG: unable to handle page fault for address: ffff888b30b774b0\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n Oops: Oops: 0000 [#1] SMP PTI\n RIP: 0010:__d_lookup+0x56/0x120\n Call Trace:\n d_lookup.cold+0x16/0x5d\n lookup_dcache+0x27/0xf0\n lookup_one_qstr_excl+0x2a/0x180\n start_dirop+0x55/0xa0\n simple_start_creating+0x8d/0xa0\n debugfs_start_creating+0x8c/0x180\n debugfs_create_dir+0x1d/0x1c0\n pinctrl_init+0x6d/0x140\n do_one_initcall+0x6d/0x3d0\n kernel_init_freeable+0x39f/0x460\n kernel_init+0x2a/0x260\n\nThere will be only one bucket in dentry_hashtable when dhash_entries is\nset as one, and d_hash_shift is calculated as 32 by dcache_init(). Then,\nfollowing process will access more than one buckets(which memory region\nis not allocated) in dentry_hashtable:\n d_lookup\n b = d_hash(hash)\n dentry_hashtable + ((u32)hashlen >> d_hash_shift)\n // The C standard defines the behavior of right shift amounts\n // exceeding the bit width of the operand as undefined. The\n // result of '(u32)hashlen >> d_hash_shift' becomes 'hashlen',\n // so 'b' will point to an unallocated memory region.\n hlist_bl_for_each_entry_rcu(b)\n hlist_bl_first_rcu(head)\n h->first // read OOB!\n\nFix it by limiting the minimal number of dentry_hashtable bucket to two,\nso that 'd_hash_shift' won't exceeds the bit width of type u32.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "99d263d4c5b2f541dfacb5391e22e8c91ea982a6", "status": "affected", "versionType": "git", "lessThan": "45b06bb5ea96f75ad81d7ef446f832ea6b0026fe" }, { "version": "99d263d4c5b2f541dfacb5391e22e8c91ea982a6", "status": "affected", "versionType": "git", "lessThan": "426ef05e82ee52c8d0e95fc0808b7383d8352d73" }, { "version": "99d263d4c5b2f541dfacb5391e22e8c91ea982a6", "status": "affected", "versionType": "git", "lessThan": "ddd57ebce245f9c7e2f6902a6c087d6186d2385d" }, { "version": "99d263d4c5b2f541dfacb5391e22e8c91ea982a6", "status": "affected", "versionType": "git", "lessThan": "755b40903eff563768d4d96fd4ef51ec48adde3b" }, { "version": "99d263d4c5b2f541dfacb5391e22e8c91ea982a6", "status": "affected", "versionType": "git", "lessThan": "5718df131ab78897a9dd1f2e71c3ba732d4392af" }, { "version": "99d263d4c5b2f541dfacb5391e22e8c91ea982a6", "status": "affected", "versionType": "git", "lessThan": "277cedabb0ab86baae83fa58218be13c6d3e5526" }, { "version": "99d263d4c5b2f541dfacb5391e22e8c91ea982a6", "status": "affected", "versionType": "git", "lessThan": "f08fe8891c3eeb63b73f9f1f6d97aa629c821579" }, { "version": "d4c96061fddd129778ce8b70fb093aa532f422d0", "status": "affected", "versionType": "git" }, { "version": "be2378cbffe50ce0161f0fdee914adee98af53dc", "status": "affected", "versionType": "git" }, { "version": "a8be8af18485f9fade90e1743d940252a39eec84", "status": "affected", "versionType": "git" }, { "version": "b5cf3193759f7cd1cfbeef11f5cf067bbce22e55", "status": "affected", "versionType": "git" }, { "version": "3.10.55", "status": "affected", "versionType": "semver", "lessThan": "3.11" }, { "version": "3.12.29", "status": "affected", "versionType": "semver", "lessThan": "3.13" }, { "version": "3.14.19", "status": "affected", "versionType": "semver", "lessThan": "3.15" }, { "version": "3.16.3", "status": "affected", "versionType": "semver", "lessThan": "3.17" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.17", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.17" }, { "version": "6.1.175", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.136", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.83", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.24", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "6.19.14", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.19.*" }, { "version": "7.0.1", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.0.*" }, { "version": "7.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }