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vuln-cve/data/2026/99xxx/CVE-2026-99088.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-99088",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-25T10:25:14.390Z",
"datePublished": "2026-10-26T14:51:58.460Z",
"dateUpdated": "2026-10-30T12:41:39.655Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-30T12:41:39.655Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: validate transport header presence in set_ipv6_addr\n\nWhen executing IPv6 address rewrite actions on IPv6 fragments,\nset_ipv6_addr() calls update_ipv6_checksum(). If parse_ipv6hdr()\nprocesses a non-first IPv6 fragment, it sets key->ip.proto to\nNEXTHDR_FRAGMENT and returns early without calling\nskb_set_transport_header().\n\nupdate_ipv6_checksum() unconditionally evaluates skb_transport_offset()\non entry before checking l4_proto. Because skb->transport_header is\nuninitialized, this triggers a warning under CONFIG_DEBUG_NET=y although\nit is completely harmless.\n\nFix this by returning early in update_ipv6_checksum() if l4_proto is\nNEXTHDR_FRAGMENT. This avoids reading the uninitialized transport offset\nfor fragments while preserving the debug warning for any other protocol\nwhere the transport header is unexpectedly missing.\n\nSee the syzbot trace:\n\n!skb_transport_header_was_set(skb)\nWARNING: ./include/linux/skbuff.h:3075 at skb_transport_header include/linux/skbuff.h:3075 [inline], CPU#1: syz-executor463/5635\nWARNING: ./include/linux/skbuff.h:3075 at skb_transport_offset include/linux/skbuff.h:3250 [inline], CPU#1: syz-executor463/5635\nWARNING: ./include/linux/skbuff.h:3075 at update_ipv6_checksum net/openvswitch/actions.c:361 [inline], CPU#1: syz-executor463/5635\nWARNING: ./include/linux/skbuff.h:3075 at set_ipv6_addr+0x462/0x660 net/openvswitch/actions.c:399, CPU#1: syz-executor463/5635\n[...]\nRIP: 0010:skb_transport_header include/linux/skbuff.h:3075 [inline]\nRIP: 0010:skb_transport_offset include/linux/skbuff.h:3250 [inline]\nRIP: 0010:update_ipv6_checksum net/openvswitch/actions.c:361 [inline]\nRIP: 0010:set_ipv6_addr+0x462/0x660 net/openvswitch/actions.c:399\n[...]\nCall Trace:\n <TASK>\n set_ipv6 net/openvswitch/actions.c:531 [inline]\n do_execute_actions+0x557e/0x8600 net/openvswitch/actions.c:1366\n ovs_execute_actions+0xde/0x520 net/openvswitch/actions.c:1592\n ovs_packet_cmd_execute+0xb4f/0xf10 net/openvswitch/datapath.c:705\n genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114\n genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209\n netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2572\n genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218\n netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1361\n netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1916\n sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800"
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/openvswitch/actions.c"
],
"versions": [
{
"version": "3fdbd1ce11e5c0d7cafbe44c942c5cad61113d7b",
"lessThan": "1efa6842e94aa70237446b31fbe2bc16586809c3",
"status": "affected",
"versionType": "git"
},
{
"version": "3fdbd1ce11e5c0d7cafbe44c942c5cad61113d7b",
"lessThan": "ad4258db21e801a7aae614afca89a2e39283080d",
"status": "affected",
"versionType": "git"
},
{
"version": "3fdbd1ce11e5c0d7cafbe44c942c5cad61113d7b",
"lessThan": "54cb98ed23866205926298621e04169f50665b59",
"status": "affected",
"versionType": "git"
},
{
"version": "3fdbd1ce11e5c0d7cafbe44c942c5cad61113d7b",
"lessThan": "b7b80d204abdc258006f9e17c92b363ab13bb599",
"status": "affected",
"versionType": "git"
},
{
"version": "3fdbd1ce11e5c0d7cafbe44c942c5cad61113d7b",
"lessThan": "6774af7cd17be8f0d0f70de3a749d381b4f2e9da",
"status": "affected",
"versionType": "git"
},
{
"version": "3fdbd1ce11e5c0d7cafbe44c942c5cad61113d7b",
"lessThan": "2594795fd832f0253826d64ff8976b8ff5fbfe9f",
"status": "affected",
"versionType": "git"
},
{
"version": "3fdbd1ce11e5c0d7cafbe44c942c5cad61113d7b",
"lessThan": "6b8897ba0733f88f0360ea48a970f373f9142de0",
"status": "affected",
"versionType": "git"
},
{
"version": "3fdbd1ce11e5c0d7cafbe44c942c5cad61113d7b",
"lessThan": "3c6a4b11330fe424557538a98fca9f0a4c5bf313",
"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/openvswitch/actions.c"
],
"versions": [
{
"version": "3.8",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.8",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.273",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.160",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.113",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.57",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.11",
"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": "5.10.273"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "5.15.224"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "6.1.191"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "6.6.160"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "6.12.113"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "6.18.57"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "7.2.11"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "7.3"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/1efa6842e94aa70237446b31fbe2bc16586809c3"
},
{
"url": "https://git.kernel.org/stable/c/ad4258db21e801a7aae614afca89a2e39283080d"
},
{
"url": "https://git.kernel.org/stable/c/54cb98ed23866205926298621e04169f50665b59"
},
{
"url": "https://git.kernel.org/stable/c/b7b80d204abdc258006f9e17c92b363ab13bb599"
},
{
"url": "https://git.kernel.org/stable/c/6774af7cd17be8f0d0f70de3a749d381b4f2e9da"
},
{
"url": "https://git.kernel.org/stable/c/2594795fd832f0253826d64ff8976b8ff5fbfe9f"
},
{
"url": "https://git.kernel.org/stable/c/6b8897ba0733f88f0360ea48a970f373f9142de0"
},
{
"url": "https://git.kernel.org/stable/c/3c6a4b11330fe424557538a98fca9f0a4c5bf313"
}
],
"title": "net: openvswitch: validate transport header presence in set_ipv6_addr",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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