{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68127", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.369Z", "datePublished": "2026-08-10T11:58:48.489Z", "dateUpdated": "2026-08-19T16:29:41.771Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:29:41.771Z" }, "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "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->loc = p->locator 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": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/ila/ila_common.c" ], "versions": [ { "version": "33f11d16142b06588eedfc1dd8cf93790979a712", "lessThan": "e451a904606c571f731ef7a06b3398619dce5300", "status": "affected", "versionType": "git" }, { "version": "33f11d16142b06588eedfc1dd8cf93790979a712", "lessThan": "1eadcb43893b897ade85ac5bf5c618054bc3c655", "status": "affected", "versionType": "git" }, { "version": "33f11d16142b06588eedfc1dd8cf93790979a712", "lessThan": "ba353caafb06ccee57b78d3254e3cebf1dea4a93", "status": "affected", "versionType": "git" }, { "version": "33f11d16142b06588eedfc1dd8cf93790979a712", "lessThan": "896a9512d0d83c2a4b357e5585b7b62a8e3f95c1", "status": "affected", "versionType": "git" }, { "version": "33f11d16142b06588eedfc1dd8cf93790979a712", "lessThan": "7097a0280b178237265681be66d1bef11d15894b", "status": "affected", "versionType": "git" }, { "version": "33f11d16142b06588eedfc1dd8cf93790979a712", "lessThan": "472aba2603ca74c4f7722cb0c0296942b0776b8d", "status": "affected", "versionType": "git" }, { "version": "33f11d16142b06588eedfc1dd8cf93790979a712", "lessThan": "c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc", "status": "affected", "versionType": "git" }, { "version": "33f11d16142b06588eedfc1dd8cf93790979a712", "lessThan": "92d3817649df2b0b6a008a686c8275c88d7ef594", "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/ila/ila_common.c" ], "versions": [ { "version": "4.5", "status": "affected" }, { "version": "0", "lessThan": "4.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "4.5", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "7.2" } ] } ] } ], "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" } ], "title": "ila: reload IPv6 header after pskb_may_pull in checksum adjust", "x_generator": { "engine": "bippy-1.2.0" } } } }