{ "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-2026-98588", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-98588", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-10-18T15:19:00.934Z", "updatedAt": "2026-10-19T09:22:13.833Z", "importedAt": "2026-10-24T01:58:41.756Z", "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": "bpf, sockmap: Reject max_entries > INT_MAX in sock_map_alloc", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Reject max_entries > INT_MAX in sock_map_alloc\n\nsock_map_alloc() only rejects max_entries == 0 and otherwise allows any\nu32 value. sock_map_free() then walks the sks[] array with a signed int\niterator:\n\n\tint i;\n\tfor (i = 0; i < stab->map.max_entries; i++)\n\t\tstruct sock **psk = &stab->sks[i];\n\nWhen a SOCKMAP is created with max_entries = 0xffffffff (UINT_MAX), the\nallocation of 32 GiB can succeed on large-memory hosts. During free the\ncounter reaches 0x80000000, wraps to INT_MIN, is sign-extended by movslq\nand turned into a ~16 GiB negative offset from stab->sks, pointing far\nbelow the allocation.\n\nThe faulting access is an xchg() write in sock_map_free(). Without\nKASAN, the same out-of-bounds write can fault on an unmapped vmalloc page\nor corrupt an unrelated allocation if that vmalloc address is populated.\nOn a KASAN kernel with CONFIG_KASAN_VMALLOC=y, the shadow check for that\naddress hits an unmapped shadow page and oopses first:\n\n BUG: unable to handle page fault for address: fffff521b59c5a00\n RIP: 0010:kasan_check_range+0x107/0x190\n Call Trace:\n sock_map_free+0x93/0x190\n map_create+0x68d/0xb30\n __sys_bpf+0x21e/0x2e70\n\nVmcore confirmed stab->map.max_entries == 0xffffffff, stab->sks ==\n0xffffc911ace2d000, and the faulting address sks + (s64)INT_MIN * 8\nexactly at 0xffffc90dace2d000. The same buggy path is reached on the\nnormal close()/bpf_map_free_deferred() path whenever such a map is\ndestroyed.\n\nsock_map_alloc() used to bound its allocation size through\nbpf_map_charge_init(), but the bound was dropped when rlimit-based memory\naccounting was removed. Reject max_entries > INT_MAX at creation time so\nthe signed iterator in sock_map_free() never sees a value that would\noverflow.\n\nTriggered by syzkaller and reproduced on both a 6.6-based KASAN kernel\nand the upstream v7.3-rc2 kernel.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "status": "affected", "versionType": "git", "lessThan": "f4a73f49e256bd835368504462be3b57b03febff" }, { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "status": "affected", "versionType": "git", "lessThan": "c56191af3a578b9cc265fa3bd5fc0752c59c1781" }, { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "status": "affected", "versionType": "git", "lessThan": "909f761868fda329dc69130ef9eb5b5795bcdf00" }, { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "status": "affected", "versionType": "git", "lessThan": "cc70972ddbf0e3398f2f32624d31db78594d50d8" }, { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "status": "affected", "versionType": "git", "lessThan": "cea597519b9ca6d691c98d92460ead8ece2a07af" }, { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "status": "affected", "versionType": "git", "lessThan": "ba7d627dbc67d62df2fa66d7b41e743c3ace0ec8" }, { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "status": "affected", "versionType": "git", "lessThan": "814a81c842bd88f6bd8a4ce550d560df071a5d03" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.11", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.11" }, { "version": "5.15.222", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.189", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.158", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.112", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.55", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.9", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }