VULN/vuln-cve
1
0 Fork 0
Code Pull Requests Actions 1 Activity
Files
c1444140e59c61ba154436ea0cd6284d8a97c3f0
vuln-cve/data/2026/98xxx/CVE-2026-98532.json
T

264 lines
15 KiB
JSON
Raw Blame History

{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-98532",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-25T10:25:14.355Z",
"datePublished": "2026-10-18T15:17:50.490Z",
"dateUpdated": "2026-10-24T14:09:19.064Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-24T14:09:19.064Z"
},
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 8.1,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - A routed IPv6 datagram can carry a short Destination Options header whose hdrlen declares up to 2048 bytes; __netif_receive_skb_core() -> netdev_frame_hook() -> ovs_vport_receive() -> parse_ipv6hdr() reaches the patched ipv6_find_hdr(), which returns a transport offset beyond skb->len.\nAC:H - Corruption requires the packet to match a preinstalled OVS_ACTION_ATTR_SET_MASKED IPv6 address-rewrite action that changes an address; although the sender controls nexthdr and hdrlen, that capability-gated datapath state is outside a remote attacker's control.\nPR:N - netdev_frame_hook() and ovs_vport_receive() process matching received packets without authentication or capability checks; GENL_UNS_ADMIN_PERM protects installation of the OVS flow, not the remote sender triggering it.\nUI:N - Once the affected OVS rewrite flow exists, packet receipt automatically runs parse_ipv6hdr(), ovs_dp_process_packet(), and set_ipv6_addr() without any victim action.\nS:U - The bad offset from ipv6_find_hdr() and the resulting skbuff corruption occur within the same host kernel networking security authority; this is ordinary in-kernel compromise rather than a boundary-enforcement bypass.\nC:H - inet_proto_csum_replace16() reads the attacker-selected out-of-range 16-bit location before rewriting it; hdrlen can place this access in adjacent or reclaimed skbuff_small_head storage, where corrupting skb pointer or length metadata can enable broader kernel-memory disclosure.\nI:H - inet_proto_csum_replace16() stores through tcp_hdr(), udp_hdr(), or icmp6_hdr() at the unchecked transport offset; hdrlen selects a location up to roughly 2 KiB past the packet and the IPv6 address delta controls the 16-bit modification, yielding an exploitable heap-write primitive.\nA:H - The demonstrated set_ipv6_addr() path produced a KASAN slab-use-after-free in inet_proto_csum_replace16(); repeated matching packets can corrupt adjacent skb storage and cause a kernel oops or panic."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/ipv6/exthdrs_core.c"
],
"versions": [
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "ca96b38730e31357ef4a9d76af1336958ac670d7",
"status": "affected",
"versionType": "git"
},
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "531255de8971c06d5d5986f85fdc2525d707ba71",
"status": "affected",
"versionType": "git"
},
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "543354c6efb27eae3372a3a9674aeaa2a86e2b2c",
"status": "affected",
"versionType": "git"
},
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "dc92cb972e86790b8078337ec41015b748b8f8e5",
"status": "affected",
"versionType": "git"
},
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "1c70275ca87e769e1a52abc644d61372d8c016cb",
"status": "affected",
"versionType": "git"
},
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "1d42828565889632068fbc2983c34d57c66af4e0",
"status": "affected",
"versionType": "git"
},
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "4254d5878c320c19961dd0b8e1d0aca4800d8b7d",
"status": "affected",
"versionType": "git"
},
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "ee319bd3a0e976af5087cbe59ebc50a66f31d202",
"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/ipv6/exthdrs_core.c"
],
"versions": [
{
"version": "3.8",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.8",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.271",
"lessThanOrEqual": "5.10.*",
"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": "3.8",
"versionEndExcluding": "5.10.271"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "5.15.222"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "6.1.189"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "6.6.158"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "6.12.112"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "6.18.55"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "7.2.9"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "7.3"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/ca96b38730e31357ef4a9d76af1336958ac670d7"
},
{
"url": "https://git.kernel.org/stable/c/531255de8971c06d5d5986f85fdc2525d707ba71"
},
{
"url": "https://git.kernel.org/stable/c/543354c6efb27eae3372a3a9674aeaa2a86e2b2c"
},
{
"url": "https://git.kernel.org/stable/c/dc92cb972e86790b8078337ec41015b748b8f8e5"
},
{
"url": "https://git.kernel.org/stable/c/1c70275ca87e769e1a52abc644d61372d8c016cb"
},
{
"url": "https://git.kernel.org/stable/c/1d42828565889632068fbc2983c34d57c66af4e0"
},
{
"url": "https://git.kernel.org/stable/c/4254d5878c320c19961dd0b8e1d0aca4800d8b7d"
},
{
"url": "https://git.kernel.org/stable/c/ee319bd3a0e976af5087cbe59ebc50a66f31d202"
}
],
"title": "ipv6: do not let ipv6_find_hdr() return an offset past the packet end",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
View Git Blame Copy Permalink