CVE-2026-98532
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: do not let ipv6_find_hdr() return an offset past the packet end ipv6_find_hdr() walks the extension header chain, skipping each header by the length that header itself declares. ipv6_optlen() returns up to 2048, and the skip is never checked against skb->len, so the offset stored in *offset can point past the end of the packet. openvswitch installs that offset as the transport header, and update_ipv6_checksum() then reads and writes the transport checksum field out of bounds: BUG: KASAN: slab-use-after-free in inet_proto_csum_replace16+0x445/0x470 Read of size 2 at addr ffff88810b754b06 by task ovs_ipv6_oob/629 CPU: 4 UID: 1000 PID: 629 Comm: ovs_ipv6_oob Tainted: G N 7.3.0-rc3+ #348 Call Trace: inet_proto_csum_replace16+0x445/0x470 set_ipv6_addr+0x3dd/0x460 do_execute_actions+0x6a3d/0x7c40 ovs_execute_actions+0xfd/0x480 ovs_packet_cmd_execute+0xc38/0xf20 genl_rcv_msg+0x59e/0x870 netlink_rcv_skb+0x18b/0x450 genl_rcv+0x2d/0x40 netlink_unicast+0x6bc/0xa20 The buggy address belongs to the object at ffff88810b754980 which belongs to the cache skbuff_small_head of size 704 The buggy address is located 390 bytes inside of freed 704-byte region [ffff88810b754980, ffff88810b754c40) Other callers use that offset too, so bound it here rather than in one caller. Reject a header whose declared length does not fit in the packet. ipv6_find_hdr() already fails with -EBADMSG on a malformed chain, so this adds no new failure mode.
View original CVE JSON
{
"id": "CVE-2026-98532",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-10-18T16:17:04.790",
"lastModified": "2026-10-24T14:16:46.340",
"vulnStatus": "Received",
"cveTags": [],
"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."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"net/ipv6/exthdrs_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "ca96b38730e31357ef4a9d76af1336958ac670d7",
"versionType": "git",
"status": "affected"
},
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "531255de8971c06d5d5986f85fdc2525d707ba71",
"versionType": "git",
"status": "affected"
},
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "543354c6efb27eae3372a3a9674aeaa2a86e2b2c",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "dc92cb972e86790b8078337ec41015b748b8f8e5",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "1c70275ca87e769e1a52abc644d61372d8c016cb",
"versionType": "git",
"status": "affected"
},
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "1d42828565889632068fbc2983c34d57c66af4e0",
"versionType": "git",
"status": "affected"
},
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "4254d5878c320c19961dd0b8e1d0aca4800d8b7d",
"versionType": "git",
"status": "affected"
},
{
"version": "f8f626754ebeca613cf1af2e6f890cfde0e74d5b",
"lessThan": "ee319bd3a0e976af5087cbe59ebc50a66f31d202",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"net/ipv6/exthdrs_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "3.8",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.8",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.271",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.222",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.189",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.158",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.112",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.55",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.9",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"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",
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 2.2,
"impactScore": 5.9
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/1c70275ca87e769e1a52abc644d61372d8c016cb",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
"url": "https://git.kernel.org/stable/c/4254d5878c320c19961dd0b8e1d0aca4800d8b7d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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{
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{
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}