268 lines
14 KiB
JSON
268 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-68426",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-30T09:28:09.392Z",
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"datePublished": "2026-08-10T12:04:46.945Z",
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"dateUpdated": "2026-10-30T12:28:35.226Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:28:35.226Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: fix stale skb->prev after async crypto steals a GSO segment\n\nskb_gso_segment() leaves the segment list head with ->prev pointing at\nthe last segment, an invariant validate_xmit_skb_list() relies on when\nit sets its tail pointer (tail = skb->prev).\n\nWhen validate_xmit_xfrm() walks a GSO list and some segments are stolen\nby async crypto (->xmit() returns -EINPROGRESS), those segments are\nunlinked from the list but the head ->prev is never updated. If the\nlast segment is the one stolen, the returned head still has ->prev\npointing at it, even though it is now owned by the crypto engine and may\nbe freed. validate_xmit_skb_list() later does tail->next = skb, writing\nthrough that stale pointer -- a use-after-free.\n\nRepoint skb->prev at the last retained segment before returning."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The bug is in the IPsec transmit path (validate_xmit_xfrm) which processes any skb routed into an offloaded SA, including GRO-aggregated traffic forwarded from remote hosts on an IPsec gateway; xfrm_dev_offload_ok() has no socket/local-origin requirement, so a remote peer's packet stream drives the vulnerable GSO segmentation and async-crypto steal directly.\nAC:L - The attacker drives both preconditions with traffic alone: sustained large GSO flows keep the crypto engine backlogged so ->xmit() returns -EINPROGRESS routinely, and packet volume advances xo->seq.low toward the wrap that forces segmentation; each stolen trailing segment reproduces the stale skb->prev, and the subsequent tail->next write is deterministic once it occurs.\nPR:N - On an IPsec gateway the traffic that triggers the path is forwarded from remote, unauthenticated senders — no account, credentials, or capability on the target host is needed, since the SA and offload are pre-existing administrative configuration rather than something the attacker must set up.\nUI:N - No victim action is required; the vulnerable code runs automatically in softirq context on every qualifying transmit, driven purely by the attacker's packet stream.\nS:U - The corruption is of kernel sk_buff list state within the same host kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Writing through the stale ->prev is a use-after-free on an skb whose memory the attacker can influence via heap grooming with concurrent traffic; per kernel UAF guidance this yields a high-confidentiality primitive, and the corrupted list can splice engine-owned skbs into the transmit path, exposing freed/reused memory contents on the wire.\nI:H - tail->next = skb is an attacker-influenced pointer write into freed heap memory, and the resulting skb list corruption lets live and engine-owned skbs be chained together; this is classic heap corruption that can be shaped via spraying into an arbitrary write or control-flow hijack.\nA:H - Even without full exploitation the use-after-free write and the double-ownership of a stolen segment cause list corruption, double-free/oops and kernel panic in the softirq transmit path, taking down the gateway."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/xfrm/xfrm_device.c"
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],
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"versions": [
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{
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"version": "f53c723902d1ac5f0b0a11d7c9dcbff748dde74e",
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"lessThan": "4e695742396be18d5291c310a3d7c450959d647a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f53c723902d1ac5f0b0a11d7c9dcbff748dde74e",
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"lessThan": "4927ab8a8acc8db4fad33e803d1d35e0b16cef83",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f53c723902d1ac5f0b0a11d7c9dcbff748dde74e",
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"lessThan": "b58731e0570bfd3989999fc2baf9ee4fecd5bec6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f53c723902d1ac5f0b0a11d7c9dcbff748dde74e",
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"lessThan": "33e1b0d25ca0d2818c635ff80e6aa0d295e08a98",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f53c723902d1ac5f0b0a11d7c9dcbff748dde74e",
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"lessThan": "bbca7cc3b2b4b10afbfee99b81d9ee78f5423046",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f53c723902d1ac5f0b0a11d7c9dcbff748dde74e",
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"lessThan": "3f4c3919baf0944ad96580467c302bc6c7758b00",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/xfrm/xfrm_device.c"
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],
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"versions": [
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{
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"version": "4.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.16",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.114",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.42",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.6",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.16",
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"versionEndExcluding": "6.1.191"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.16",
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"versionEndExcluding": "6.6.160"
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},
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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}
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/4e695742396be18d5291c310a3d7c450959d647a"
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},
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{
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"url": "https://git.kernel.org/stable/c/4927ab8a8acc8db4fad33e803d1d35e0b16cef83"
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},
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{
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"url": "https://git.kernel.org/stable/c/b58731e0570bfd3989999fc2baf9ee4fecd5bec6"
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},
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{
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"url": "https://git.kernel.org/stable/c/33e1b0d25ca0d2818c635ff80e6aa0d295e08a98"
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},
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{
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"url": "https://git.kernel.org/stable/c/bbca7cc3b2b4b10afbfee99b81d9ee78f5423046"
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},
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{
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"url": "https://git.kernel.org/stable/c/3f4c3919baf0944ad96580467c302bc6c7758b00"
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}
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],
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"title": "xfrm: fix stale skb->prev after async crypto steals a GSO segment",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-68426",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:48:46.371818Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T21:09:09.834Z"
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}
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}
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]
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}
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} |