242 lines
15 KiB
JSON
242 lines
15 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-2022-49096",
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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": "2025-02-26T01:49:39.249Z",
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"datePublished": "2025-02-26T01:54:49.108Z",
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"dateUpdated": "2026-08-05T08:53:55.150Z"
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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": "2026-08-05T08:53:55.150Z"
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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\nnet: sfc: add missing xdp queue reinitialization\n\nAfter rx/tx ring buffer size is changed, kernel panic occurs when\nit acts XDP_TX or XDP_REDIRECT.\n\nWhen tx/rx ring buffer size is changed(ethtool -G), sfc driver\nreallocates and reinitializes rx and tx queues and their buffer\n(tx_queue->buffer).\nBut it misses reinitializing xdp queues(efx->xdp_tx_queues).\nSo, while it is acting XDP_TX or XDP_REDIRECT, it uses the uninitialized\ntx_queue->buffer.\n\nA new function efx_set_xdp_channels() is separated from efx_set_channels()\nto handle only xdp queues.\n\nSplat looks like:\n BUG: kernel NULL pointer dereference, address: 000000000000002a\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 0 P4D 0\n Oops: 0002 [#4] PREEMPT SMP NOPTI\n RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc]\n CPU: 2 PID: 0 Comm: swapper/2 Tainted: G D 5.17.0+ #55 e8beeee8289528f11357029357cf\n Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80\n RSP: 0018:ffff92f121e45c60 EFLAGS: 00010297\n RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc]\n RAX: 0000000000000040 RBX: ffff92ea506895c0 RCX: ffffffffc0330870\n RDX: 0000000000000001 RSI: 00000001139b10ce RDI: ffff92ea506895c0\n RBP: ffffffffc0358a80 R08: 00000001139b110d R09: 0000000000000000\n R10: 0000000000000001 R11: ffff92ea414c0088 R12: 0000000000000040\n R13: 0000000000000018 R14: 00000001139b10ce R15: ffff92ea506895c0\n FS: 0000000000000000(0000) GS:ffff92f121ec0000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80\n CR2: 000000000000002a CR3: 00000003e6810004 CR4: 00000000007706e0\n RSP: 0018:ffff92f121e85c60 EFLAGS: 00010297\n PKRU: 55555554\n RAX: 0000000000000040 RBX: ffff92ea50689700 RCX: ffffffffc0330870\n RDX: 0000000000000001 RSI: 00000001145a90ce RDI: ffff92ea50689700\n RBP: ffffffffc0358a80 R08: 00000001145a910d R09: 0000000000000000\n R10: 0000000000000001 R11: ffff92ea414c0088 R12: 0000000000000040\n R13: 0000000000000018 R14: 00000001145a90ce R15: ffff92ea50689700\n FS: 0000000000000000(0000) GS:ffff92f121e80000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 000000000000002a CR3: 00000003e6810005 CR4: 00000000007706e0\n PKRU: 55555554\n Call Trace:\n <IRQ>\n efx_xdp_tx_buffers+0x12b/0x3d0 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]\n __efx_rx_packet+0x5c3/0x930 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]\n efx_rx_packet+0x28c/0x2e0 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]\n efx_ef10_ev_process+0x5f8/0xf40 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]\n ? enqueue_task_fair+0x95/0x550\n efx_poll+0xc4/0x360 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]"
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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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:L - The vulnerable state is created only via local ethtool ring-parameter changes (ETHTOOL_SRINGPARAM / ETHTOOL_MSG_RINGS_SET → efx_realloc_channels). Remote packets merely exercise the already-dangling XDP TX queue pointers after that local reconfiguration.\nAC:L - A local attacker who can change ring parameters (and who can rely on or attach an XDP program that returns XDP_TX/XDP_REDIRECT) can reliably provoke the stale xdp_tx_queues use; this is a deterministic post-realloc UAF, not a race or otherwise attacker-uncontrollable condition.\nPR:L - Triggering the realloc path requires CAP_NET_ADMIN in the network namespace that owns the Solarflare device (ns_capable), which is available to low-privileged contexts such as containers granted CAP_NET_ADMIN, so Privileges Required is Low rather than High.\nUI:N - No separate victim action is required; the attacker (or automated privileged tooling they control) performs the ethtool reconfiguration and can generate or wait for traffic that hits XDP_TX/XDP_REDIRECT.\nS:U - Impact stays within the kernel/host security authority; this is a same-host driver memory-corruption/DoS issue, not a VM escape, IOMMU bypass, or other cross-boundary break.\nC:H - efx->xdp_tx_queues retains pointers into kfree'd channel/tx_queue objects, so the subsequent XDP TX path is a use-after-free that can be leveraged for arbitrary kernel memory disclosure via controlled reuse of the freed objects.\nI:H - The same UAF lets an attacker spray/reuse the freed tx_queue/channel memory and corrupt kernel state through efx_tx_map_chunk and related TX bookkeeping, enabling integrity compromise and control-flow hijacking primitives.\nA:H - The demonstrated failure is a kernel NULL-pointer dereference/oops in IRQ/NAPI context (efx_tx_map_chunk), and UAFs of this form also crash unpredictably when freed memory is reused, so availability impact is High."
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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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"drivers/net/ethernet/sfc/efx_channels.c"
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],
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"versions": [
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{
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"version": "3990a8fffbdad5765f47ea593f9de66c91762059",
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"lessThan": "ed7a824fda8732578d1014fad1f7fb0363705090",
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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": "3990a8fffbdad5765f47ea593f9de66c91762059",
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"lessThan": "b8c46bc358d84701e7f7ffa054037db25f25da0e",
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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": "3990a8fffbdad5765f47ea593f9de66c91762059",
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"lessThan": "dcc85e1593686e42c6749ef3d356db34759d59e8",
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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": "3990a8fffbdad5765f47ea593f9de66c91762059",
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"lessThan": "059a47f1da93811d37533556d67e72f2261b1127",
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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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"drivers/net/ethernet/sfc/efx_channels.c"
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],
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"versions": [
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{
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"version": "5.5",
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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": "5.5",
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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": "5.15.34",
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"lessThanOrEqual": "5.15.*",
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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": "5.16.20",
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"lessThanOrEqual": "5.16.*",
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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": "5.17.3",
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"lessThanOrEqual": "5.17.*",
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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": "5.18",
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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": "5.5",
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"versionEndExcluding": "5.15.34"
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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": "5.5",
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"versionEndExcluding": "5.16.20"
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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": "5.5",
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"versionEndExcluding": "5.17.3"
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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": "5.5",
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"versionEndExcluding": "5.18"
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}
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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/ed7a824fda8732578d1014fad1f7fb0363705090"
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},
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{
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"url": "https://git.kernel.org/stable/c/b8c46bc358d84701e7f7ffa054037db25f25da0e"
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},
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{
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"url": "https://git.kernel.org/stable/c/dcc85e1593686e42c6749ef3d356db34759d59e8"
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},
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{
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"url": "https://git.kernel.org/stable/c/059a47f1da93811d37533556d67e72f2261b1127"
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}
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],
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"title": "net: sfc: add missing xdp queue reinitialization",
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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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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 5.5,
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"attackVector": "LOCAL",
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"baseSeverity": "MEDIUM",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"integrityImpact": "NONE",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "NONE"
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}
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},
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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-2022-49096",
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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": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2025-10-01T19:49:29.340028Z"
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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-476",
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"description": "CWE-476 NULL Pointer Dereference"
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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": "2025-10-01T19:57:05.717Z"
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}
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}
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]
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}
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} |