{"id":"CVE-2026-98532","revision":"c952e88a79fd49179d0392daacf089cb","records":[{"revision":"c952e88a79fd49179d0392daacf089cb","observedAt":"2026-10-24T16:17:04.479+00:00","statement":{"source":"cve-program","id":"CVE-2026-98532","aliases":[],"title":"ipv6: do not let ipv6_find_hdr() return an offset past the packet end","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: do not let ipv6_find_hdr() return an offset past the packet end\n\nipv6_find_hdr() walks the extension header chain, skipping each header by\nthe length that header itself declares.  ipv6_optlen() returns up to 2048,\nand the skip is never checked against skb->len, so the offset stored in\n*offset can point past the end of the packet.\n\nopenvswitch installs that offset as the transport header, and\nupdate_ipv6_checksum() then reads and writes the transport checksum field\nout of bounds:\n\n  BUG: KASAN: slab-use-after-free in inet_proto_csum_replace16+0x445/0x470\n  Read of size 2 at addr ffff88810b754b06 by task ovs_ipv6_oob/629\n  CPU: 4 UID: 1000 PID: 629 Comm: ovs_ipv6_oob Tainted: G N 7.3.0-rc3+ #348\n  Call Trace:\n   inet_proto_csum_replace16+0x445/0x470\n   set_ipv6_addr+0x3dd/0x460\n   do_execute_actions+0x6a3d/0x7c40\n   ovs_execute_actions+0xfd/0x480\n   ovs_packet_cmd_execute+0xc38/0xf20\n   genl_rcv_msg+0x59e/0x870\n   netlink_rcv_skb+0x18b/0x450\n   genl_rcv+0x2d/0x40\n   netlink_unicast+0x6bc/0xa20\n\n  The buggy address belongs to the object at ffff88810b754980\n   which belongs to the cache skbuff_small_head of size 704\n  The buggy address is located 390 bytes inside of\n   freed 704-byte region [ffff88810b754980, ffff88810b754c40)\n\nOther callers use that offset too, so bound it here rather than in one\ncaller.\n\nReject a header whose declared length does not fit in the packet.\nipv6_find_hdr() already fails with -EBADMSG on a malformed chain, so this\nadds no new failure mode.","state":0,"publishedAt":"2026-10-18T15:17:50.49+00:00","modifiedAt":"2026-10-24T14:09:19.064+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv6/exthdrs_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"f8f626754ebeca613cf1af2e6f890cfde0e74d5b\",\n                            \"lessThan\": \"ca96b38730e31357ef4a9d76af1336958ac670d7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f8f626754ebeca613cf1af2e6f890cfde0e74d5b\",\n                            \"lessThan\": \"531255de8971c06d5d5986f85fdc2525d707ba71\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f8f626754ebeca613cf1af2e6f890cfde0e74d5b\",\n                            \"lessThan\": \"543354c6efb27eae3372a3a9674aeaa2a86e2b2c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f8f626754ebeca613cf1af2e6f890cfde0e74d5b\",\n                            \"lessThan\": \"dc92cb972e86790b8078337ec41015b748b8f8e5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f8f626754ebeca613cf1af2e6f890cfde0e74d5b\",\n                            \"lessThan\": \"1c70275ca87e769e1a52abc644d61372d8c016cb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f8f626754ebeca613cf1af2e6f890cfde0e74d5b\",\n                            \"lessThan\": \"1d42828565889632068fbc2983c34d57c66af4e0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f8f626754ebeca613cf1af2e6f890cfde0e74d5b\",\n                            \"lessThan\": \"4254d5878c320c19961dd0b8e1d0aca4800d8b7d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f8f626754ebeca613cf1af2e6f890cfde0e74d5b\",\n                            \"lessThan\": \"ee319bd3a0e976af5087cbe59ebc50a66f31d202\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv6/exthdrs_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.8\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.55\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.9\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/ca96b38730e31357ef4a9d76af1336958ac670d7","https://git.kernel.org/stable/c/531255de8971c06d5d5986f85fdc2525d707ba71","https://git.kernel.org/stable/c/543354c6efb27eae3372a3a9674aeaa2a86e2b2c","https://git.kernel.org/stable/c/dc92cb972e86790b8078337ec41015b748b8f8e5","https://git.kernel.org/stable/c/1c70275ca87e769e1a52abc644d61372d8c016cb","https://git.kernel.org/stable/c/1d42828565889632068fbc2983c34d57c66af4e0","https://git.kernel.org/stable/c/4254d5878c320c19961dd0b8e1d0aca4800d8b7d","https://git.kernel.org/stable/c/ee319bd3a0e976af5087cbe59ebc50a66f31d202"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98532","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98532","identifiers":["CVE-2026-98532"]},"retained":false,"historicalAffected":[]}],"coverage":[]}