248 lines
14 KiB
JSON
248 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-2026-98158",
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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": "2026-09-25T10:25:14.321Z",
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"datePublished": "2026-09-25T10:36:27.608Z",
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"dateUpdated": "2026-10-19T09:14:52.068Z"
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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": "2026-10-19T09:14:52.068Z"
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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\nppp_async: drop the errored frame instead of resetting its headroom\n\nppp_receive_nonmp_frame() prepends a two-byte direction tag before running\nthe pass/active BPF filters:\n\n\t*(__be16 *)skb_push(skb, 2) = htons(PPP_FILTER_INBOUND_TAG);\n\nNothing on the receive path guarantees those two bytes of headroom. The\nframe-error path in ppp_async's process_input_packet() resets a reused skb's\nheadroom to zero while claiming to restore it to a freshly allocated state -\nbut a fresh skb from dev_alloc_skb() carries NET_SKB_PAD:\n\n\terr:\n\t\tif (skb) {\n\t\t\t/* make skb appear as freshly allocated */\n\t\t\tskb_trim(skb, 0);\n\t\t\tskb_reserve(skb, - skb_headroom(skb));\n\t\t}\n\nap->rpkt still points at that skb, so the next frame is reassembled into it\nwith no headroom at all. A peer that sends a bad-FCS frame followed by one\nbeginning ff 03 then leaves a single byte of headroom by the time the filter\ntag is pushed, which lands one byte below skb->head:\n\n skbuff: skb_under_panic: len:49 put:2 head:ffff888003c10000\n data:ffff888003c0ffff tail:0x30 end:0x640 dev:<NULL>\n kernel BUG at net/core/skbuff.c:214!\n RIP: 0010:skb_panic+0x13e/0x230\n Call Trace:\n skb_push+0xbd/0x100\n ppp_receive_nonmp_frame+0x48a/0x1d10\n ppp_input+0x4e9/0x2f80\n ppp_async_process+0x2a/0xe0\n tasklet_action_common+0x20f/0x8a0\n handle_softirqs+0x18e/0x590\n Kernel panic - not syncing: Fatal exception in interrupt\n\nZeroing the headroom violates the NET_SKB_PAD guarantee that dev_alloc_skb()\ngives the rest of the receive path. Besides the filter panic above, when CCP\ncompression is enabled ppp_decompress_frame() hands skb->data - 2 to\n->decompress()/->incomp(), which then reads out of bounds before skb->head\nfor the same reason.\n\nRather than restore the headroom, drop the errored frame - as ppp_synctty\nalready does on its error path - and clear ap->rpkt so the next frame is\nreassembled into a fresh skb with proper headroom. This is simpler and fixes\nboth the filter under-panic and the CCP out-of-bounds read.\n\nThe original V1 of this patch made room in ppp_receive_nonmp_frame() with\nskb_cow_head(); Eric pointed out that fixing the root cause in the transport\nis the right approach.\n\nFound by fuzzing the PPP receive path with a mutating peer on a pty; it is an\ninteresting (remote) DoS: root configures PPP, the peer supplies two crashing\nframes. The reproducer (repro-ppp-skb.c, unchanged from v1) panics in about a\nsecond, and returns cleanly with this applied."
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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/ppp/ppp_async.c"
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],
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"versions": [
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{
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"version": "6722e78c90054101e6797d5944cdc81af9897a0a",
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"lessThan": "25f354c55b8435d1f51b8a0a05a3cfe429358523",
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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": "6722e78c90054101e6797d5944cdc81af9897a0a",
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"lessThan": "a86a17745c3e1c6fadd4d6e90c03552dfe531c8c",
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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": "6722e78c90054101e6797d5944cdc81af9897a0a",
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"lessThan": "ff035780adb0f49dc2c7ada26b4697849a68bec8",
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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": "6722e78c90054101e6797d5944cdc81af9897a0a",
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"lessThan": "c4bb894362d224b699e2f95c6c26707d9654e4a3",
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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": "6722e78c90054101e6797d5944cdc81af9897a0a",
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"lessThan": "d0fc3dabfe67caf084e7119ceb2ee23f5ad2f2da",
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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": "6722e78c90054101e6797d5944cdc81af9897a0a",
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"lessThan": "0c53eb14975f029abd6b26896a460f0d2aaefe6b",
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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": "6722e78c90054101e6797d5944cdc81af9897a0a",
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"lessThan": "717137221c7d90e7c98bda9a370c9da6cbf015e5",
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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": "6722e78c90054101e6797d5944cdc81af9897a0a",
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"lessThan": "8dc5d98a16fa23c00999aecf10018c9f69fa5bf4",
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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/ppp/ppp_async.c"
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],
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"versions": [
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{
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"version": "2.6.15",
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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": "2.6.15",
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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": "5.10.271",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.222",
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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": "6.1.189",
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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": "6.6.158",
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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": "6.12.111",
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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": "6.18.53",
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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": "7.2.7",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "2.6.15",
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"versionEndExcluding": "5.10.271"
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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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]
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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/25f354c55b8435d1f51b8a0a05a3cfe429358523"
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},
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{
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"url": "https://git.kernel.org/stable/c/a86a17745c3e1c6fadd4d6e90c03552dfe531c8c"
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},
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{
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"url": "https://git.kernel.org/stable/c/ff035780adb0f49dc2c7ada26b4697849a68bec8"
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},
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{
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"url": "https://git.kernel.org/stable/c/c4bb894362d224b699e2f95c6c26707d9654e4a3"
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},
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{
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"url": "https://git.kernel.org/stable/c/d0fc3dabfe67caf084e7119ceb2ee23f5ad2f2da"
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},
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{
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"url": "https://git.kernel.org/stable/c/0c53eb14975f029abd6b26896a460f0d2aaefe6b"
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},
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{
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"url": "https://git.kernel.org/stable/c/717137221c7d90e7c98bda9a370c9da6cbf015e5"
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},
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{
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"url": "https://git.kernel.org/stable/c/8dc5d98a16fa23c00999aecf10018c9f69fa5bf4"
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}
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],
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"title": "ppp_async: drop the errored frame instead of resetting its headroom",
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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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}
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} |