CVE-2026-68127 (GCVE-0-2026-68127)
Vulnerability from cvelistv5
Published
2026-08-10 11:58
Modified
2026-10-19 20:58
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ila: reload IPv6 header after pskb_may_pull in checksum adjust ila_csum_adjust_transport() caches ip6h = ipv6_hdr(skb) before calling pskb_may_pull(). On a non-linear skb whose transport header sits in a page fragment, pskb_may_pull() can call __pskb_pull_tail() / pskb_expand_head() and free the old skb head, leaving ip6h dangling; the following get_csum_diff(ip6h, p) then reads freed memory. ila_update_ipv6_locator() uses ip6h (and the iaddr derived from it) again after the csum-adjust call and additionally writes the new locator through that pointer. Impact: a remote IPv6 packet routed through a configured ILA csum-adjust-transport route or receive-side mapping triggers a slab-use-after-free in ila_update_ipv6_locator() (KASAN). The route or mapping requires CAP_NET_ADMIN to configure, but trigger packets are unauthenticated once it exists. Reload ip6h after each pskb_may_pull() in ila_csum_adjust_transport() before the csum-diff read. In ila_update_ipv6_locator() only the ILA_CSUM_ADJUST_TRANSPORT case pulls the skb, so reload ip6h and iaddr in that case alone before the destination-address write; the neutral-map modes never pull and keep their cached pointers.
References
Impacted products
Vendor Product Version
Linux Linux Version: 33f11d16142b06588eedfc1dd8cf93790979a712
Version: 33f11d16142b06588eedfc1dd8cf93790979a712
Version: 33f11d16142b06588eedfc1dd8cf93790979a712
Version: 33f11d16142b06588eedfc1dd8cf93790979a712
Version: 33f11d16142b06588eedfc1dd8cf93790979a712
Version: 33f11d16142b06588eedfc1dd8cf93790979a712
Version: 33f11d16142b06588eedfc1dd8cf93790979a712
Version: 33f11d16142b06588eedfc1dd8cf93790979a712
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              "value": "AV:N - The bug is reached from ipv6_rcv() through NF_INET_PRE_ROUTING (ila_nf_input) or IPv6 routing/LWT input/output when remote IPv6 packets matching a configured ILA csum-adjust-transport mapping or route are processed; no local syscall is required on internet-facing routers, gateways, or NVO3/overlay hosts.\nAC:L - Once ILA csum-adjust-transport is configured, a remote attacker can reliably send IPv6 TCP/UDP/ICMPv6 packets whose transport headers live in skb page fragments so pskb_may_pull() reallocates the head; they control packet layout and can retry without races or uncontrollable memory layout.\nPR:N - Trigger packets are processed unauthenticated on the network datapath; although ILA routes/mappings require CAP_NET_ADMIN to install, that is operator infrastructure (also obtainable in a user netns), not a privilege the remote attacker needs to send the malformed IPv6 packets that hit ila_update_ipv6_locator().\nUI:N - No victim user action is required beyond normal IPv6 packet delivery; exploitation is fully automated once the affected ILA configuration exists and the attacker sends crafted packets to the host.\nS:U - The slab use-after-free corrupts kernel packet-processing memory within the host kernel security authority; it is not a VM escape, container breakout, or IOMMU/DMA boundary bypass.\nC:H - ila_csum_adjust_transport() reads the cached IPv6 header via get_csum_diff(ip6h, p) after pskb_may_pull() frees the old skb head, causing a slab use-after-free read of freed memory that can disclose kernel heap contents.\nI:H - ila_update_ipv6_locator() then writes iaddr-\u003eloc = p-\u003elocator through the same stale iaddr pointer derived from the freed header, giving a slab use-after-free write primitive that can be leveraged for arbitrary memory corruption and control-flow hijacking.\nA:H - The freed skb-head slab use-after-free was reproduced under KASAN and can cause kernel oops/panic during IPv6 receive/forwarding; even unsuccessful exploitation typically crashes or destabilizes the host."
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    "datePublished": "2026-08-10T11:58:48.489Z",
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    "dateUpdated": "2026-10-19T20:58:52.243Z",
    "state": "PUBLISHED"
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no local syscall is required on internet-facing routers, gateways, or NVO3/overlay hosts.\\nAC:L - Once ILA csum-adjust-transport is configured, a remote attacker can reliably send IPv6 TCP/UDP/ICMPv6 packets whose transport headers live in skb page fragments so pskb_may_pull() reallocates the head; they control packet layout and can retry without races or uncontrollable memory layout.\\nPR:N - Trigger packets are processed unauthenticated on the network datapath; although ILA routes/mappings require CAP_NET_ADMIN to install, that is operator infrastructure (also obtainable in a user netns), not a privilege the remote attacker needs to send the malformed IPv6 packets that hit ila_update_ipv6_locator().\\nUI:N - No victim user action is required beyond normal IPv6 packet delivery; exploitation is fully automated once the affected ILA configuration exists and the attacker sends crafted packets to the host.\\nS:U - The slab use-after-free corrupts kernel packet-processing memory within the host kernel security authority; it is not a VM escape, container breakout, or IOMMU/DMA boundary bypass.\\nC:H - ila_csum_adjust_transport() reads the cached IPv6 header via get_csum_diff(ip6h, p) after pskb_may_pull() frees the old skb head, causing a slab use-after-free read of freed memory that can disclose kernel heap contents.\\nI:H - ila_update_ipv6_locator() then writes iaddr-\u003eloc = p-\u003elocator through the same stale iaddr pointer derived from the freed header, giving a slab use-after-free write primitive that can be leveraged for arbitrary memory corruption and control-flow hijacking.\\nA:H - The freed skb-head slab use-after-free was reproduced under KASAN and can cause kernel oops/panic during IPv6 receive/forwarding; even unsuccessful exploitation typically crashes or destabilizes the host.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"33f11d16142b06588eedfc1dd8cf93790979a712\", \"lessThan\": \"e451a904606c571f731ef7a06b3398619dce5300\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"33f11d16142b06588eedfc1dd8cf93790979a712\", \"lessThan\": \"1eadcb43893b897ade85ac5bf5c618054bc3c655\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"33f11d16142b06588eedfc1dd8cf93790979a712\", \"lessThan\": \"ba353caafb06ccee57b78d3254e3cebf1dea4a93\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"33f11d16142b06588eedfc1dd8cf93790979a712\", \"lessThan\": \"896a9512d0d83c2a4b357e5585b7b62a8e3f95c1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"33f11d16142b06588eedfc1dd8cf93790979a712\", \"lessThan\": \"7097a0280b178237265681be66d1bef11d15894b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"33f11d16142b06588eedfc1dd8cf93790979a712\", \"lessThan\": \"472aba2603ca74c4f7722cb0c0296942b0776b8d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"33f11d16142b06588eedfc1dd8cf93790979a712\", \"lessThan\": \"c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"33f11d16142b06588eedfc1dd8cf93790979a712\", \"lessThan\": \"92d3817649df2b0b6a008a686c8275c88d7ef594\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv6/ila/ila_common.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.265\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.216\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.183\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.148\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.101\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.42\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv6/ila/ila_common.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e451a904606c571f731ef7a06b3398619dce5300\"}, {\"url\": \"https://git.kernel.org/stable/c/1eadcb43893b897ade85ac5bf5c618054bc3c655\"}, {\"url\": \"https://git.kernel.org/stable/c/ba353caafb06ccee57b78d3254e3cebf1dea4a93\"}, {\"url\": \"https://git.kernel.org/stable/c/896a9512d0d83c2a4b357e5585b7b62a8e3f95c1\"}, {\"url\": \"https://git.kernel.org/stable/c/7097a0280b178237265681be66d1bef11d15894b\"}, {\"url\": \"https://git.kernel.org/stable/c/472aba2603ca74c4f7722cb0c0296942b0776b8d\"}, {\"url\": \"https://git.kernel.org/stable/c/c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc\"}, {\"url\": \"https://git.kernel.org/stable/c/92d3817649df2b0b6a008a686c8275c88d7ef594\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nila: reload IPv6 header after pskb_may_pull in checksum adjust\\n\\nila_csum_adjust_transport() caches ip6h = ipv6_hdr(skb) before calling\\npskb_may_pull(). On a non-linear skb whose transport header sits in a page\\nfragment, pskb_may_pull() can call __pskb_pull_tail() / pskb_expand_head()\\nand free the old skb head, leaving ip6h dangling; the following\\nget_csum_diff(ip6h, p) then reads freed memory. ila_update_ipv6_locator()\\nuses ip6h (and the iaddr derived from it) again after the csum-adjust\\ncall and additionally writes the new locator through that pointer.\\n\\nImpact: a remote IPv6 packet routed through a configured ILA\\ncsum-adjust-transport route or receive-side mapping triggers a\\nslab-use-after-free in ila_update_ipv6_locator() (KASAN). The route or\\nmapping requires CAP_NET_ADMIN to configure, but trigger packets are\\nunauthenticated once it exists.\\n\\nReload ip6h after each pskb_may_pull() in ila_csum_adjust_transport()\\nbefore the csum-diff read. In ila_update_ipv6_locator() only the\\nILA_CSUM_ADJUST_TRANSPORT case pulls the skb, so reload ip6h and iaddr in\\nthat case alone before the destination-address write; the neutral-map\\nmodes never pull and keep their cached pointers.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"4.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"4.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"4.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"4.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"4.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"4.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"4.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:29:41.771Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68127\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:58:52.243Z\", \"dateReserved\": \"2026-07-30T09:28:09.369Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-10T11:58:48.489Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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