CVE-2026-98588

{"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/core/sock_map.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "f4a73f49e256bd835368504462be3b57b03febff", "status": "affected", "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "versionType": "git"}, {"lessThan": "c56191af3a578b9cc265fa3bd5fc0752c59c1781", "status": "affected", "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "versionType": "git"}, {"lessThan": "909f761868fda329dc69130ef9eb5b5795bcdf00", "status": "affected", "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "versionType": "git"}, {"lessThan": "cc70972ddbf0e3398f2f32624d31db78594d50d8", "status": "affected", "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "versionType": "git"}, {"lessThan": "cea597519b9ca6d691c98d92460ead8ece2a07af", "status": "affected", "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "versionType": "git"}, {"lessThan": "ba7d627dbc67d62df2fa66d7b41e743c3ace0ec8", "status": "affected", "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "versionType": "git"}, {"lessThan": "814a81c842bd88f6bd8a4ce550d560df071a5d03", "status": "affected", "version": "0d2c4f9640501ff57ba0be1f5644a02c29a02fa1", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/core/sock_map.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.11"}, {"lessThan": "5.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.112", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.55", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-98588", "lastModified": "2026-10-19T10:19:19.777", "metrics": {}, "published": "2026-10-18T16:17:11.393", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/814a81c842bd88f6bd8a4ce550d560df071a5d03"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/909f761868fda329dc69130ef9eb5b5795bcdf00"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ba7d627dbc67d62df2fa66d7b41e743c3ace0ec8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c56191af3a578b9cc265fa3bd5fc0752c59c1781"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cc70972ddbf0e3398f2f32624d31db78594d50d8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cea597519b9ca6d691c98d92460ead8ece2a07af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f4a73f49e256bd835368504462be3b57b03febff"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: bpf, sockmap: Reject max_entries > INT_MAX in sock_map_alloc", "id": "2555024", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555024"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-124", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf, sockmap: Reject max_entries > INT_MAX in sock_map_alloc\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:\nint i;\nfor (i = 0; i < stab->map.max_entries; i++)\nstruct sock **psk = &stab->sks[i];\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.\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:\nBUG: unable to handle page fault for address: fffff521b59c5a00\nRIP: 0010:kasan_check_range+0x107/0x190\nCall Trace:\nsock_map_free+0x93/0x190\nmap_create+0x68d/0xb30\n__sys_bpf+0x21e/0x2e70\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.\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.\nTriggered by syzkaller and reproduced on both a 6.6-based KASAN kernel\nand the upstream v7.3-rc2 kernel.", "A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) subsystem. When allocating a socket map with an excessively large entry count, a signed integer overflow occurs during cleanup when the map is released. A local user with permission to create BPF maps can trigger this issue to cause an out-of-bounds memory write, leading to kernel memory corruption or a Denial of Service (DoS) through a system crash."], "name": "CVE-2026-98588", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98588\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98588\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98588.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0d2c4f9640501ff57ba0be1f5644a02c29a02fa1,f4a73f49e256bd835368504462be3b57b03febff)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0d2c4f9640501ff57ba0be1f5644a02c29a02fa1,c56191af3a578b9cc265fa3bd5fc0752c59c1781)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0d2c4f9640501ff57ba0be1f5644a02c29a02fa1,909f761868fda329dc69130ef9eb5b5795bcdf00)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0d2c4f9640501ff57ba0be1f5644a02c29a02fa1,cc70972ddbf0e3398f2f32624d31db78594d50d8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0d2c4f9640501ff57ba0be1f5644a02c29a02fa1,cea597519b9ca6d691c98d92460ead8ece2a07af)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0d2c4f9640501ff57ba0be1f5644a02c29a02fa1,ba7d627dbc67d62df2fa66d7b41e743c3ace0ec8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0d2c4f9640501ff57ba0be1f5644a02c29a02fa1,814a81c842bd88f6bd8a4ce550d560df071a5d03)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.222,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.189,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.158,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.112,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.55,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.9,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-18T18:45:06.825620+00:00", "updated": "2026-10-22T22:00:15.029737+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}