{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98588", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.358Z", "datePublished": "2026-10-18T15:19:00.934Z", "dateUpdated": "2026-10-19T09:22:13.833Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:22:13.833Z" }, "descriptions": [ { "lang": "en", "value": "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": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/core/sock_map.c" ], "versions": [ { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "lessThan": "f4a73f49e256bd835368504462be3b57b03febff", "status": "affected", "versionType": "git" }, { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "lessThan": "c56191af3a578b9cc265fa3bd5fc0752c59c1781", "status": "affected", "versionType": "git" }, { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "lessThan": "909f761868fda329dc69130ef9eb5b5795bcdf00", "status": "affected", "versionType": "git" }, { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "lessThan": "cc70972ddbf0e3398f2f32624d31db78594d50d8", "status": "affected", "versionType": "git" }, { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "lessThan": "cea597519b9ca6d691c98d92460ead8ece2a07af", "status": "affected", "versionType": "git" }, { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "lessThan": "ba7d627dbc67d62df2fa66d7b41e743c3ace0ec8", "status": "affected", "versionType": "git" }, { "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "lessThan": "814a81c842bd88f6bd8a4ce550d560df071a5d03", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/core/sock_map.c" ], "versions": [ { "version": "5.11", "status": "affected" }, { "version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.55", "lessThanOrEqual": "6.18.*", "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" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.222" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.18.55" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f4a73f49e256bd835368504462be3b57b03febff" }, { "url": "https://git.kernel.org/stable/c/c56191af3a578b9cc265fa3bd5fc0752c59c1781" }, { "url": "https://git.kernel.org/stable/c/909f761868fda329dc69130ef9eb5b5795bcdf00" }, { "url": "https://git.kernel.org/stable/c/cc70972ddbf0e3398f2f32624d31db78594d50d8" }, { "url": "https://git.kernel.org/stable/c/cea597519b9ca6d691c98d92460ead8ece2a07af" }, { "url": "https://git.kernel.org/stable/c/ba7d627dbc67d62df2fa66d7b41e743c3ace0ec8" }, { "url": "https://git.kernel.org/stable/c/814a81c842bd88f6bd8a4ce550d560df071a5d03" } ], "title": "bpf, sockmap: Reject max_entries > INT_MAX in sock_map_alloc", "x_generator": { "engine": "bippy-1.2.0" } } } }