264 lines
15 KiB
JSON
264 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-2026-80555",
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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": "2026-08-26T14:34:25.766Z",
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"datePublished": "2026-08-26T14:37:22.969Z",
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"dateUpdated": "2026-08-27T12:40:15.211Z"
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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": "2026-08-27T12:40:15.211Z"
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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\ns390/vfio_ccw: Free all memory if cp_init() fails\n\nThe routine cp_free() is called to unpin/free any memory once an I/O\nis completed successfully, or if cp_prefetch() fails. But if cp_init()\nfails, and cp->initialized is not enabled, the same routine cannot be\nused to free all the memory.\n\nAn attempt to address this exists in ccwchain_handle_ccw(), where a\nsingle call to ccwchain_free() is made for the currently-processed\nCCW segment. But this will leak other segments (created as a result\nof a Transfer in Channel) that had been allocated as part of the same\nchannel program.\n\nAddress this by performing the cleanup outside of the recursive\nccwchain_handle_ccw()/ccwchain_loop_tic() logic."
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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:N/UI:N/S:C/C:N/I:N/A:H",
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"baseScore": 7.1,
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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 bug is reached when userspace writes the vfio-ccw io_region (VFIO device mmap/write), triggering fsm_io_request() -> cp_init(); on s390 KVM this is driven by QEMU forwarding guest channel-I/O channel programs, requiring local VFIO/device interaction rather than any network protocol.\nAC:L - An attacker can deterministically fail cp_init() after allocating multiple TIC-linked ccwchain segments by crafting a channel program whose early TIC targets succeed and a later one fails (invalid CPA, chain-length/count limit, or dma_rw error), leaking prior segments on every attempt without races.\nPR:N - On s390 KVM with CCW passthrough, a malicious guest can submit crafted multi-TIC channel programs through normal guest I/O; QEMU forwards them to vfio-ccw without the attacker holding host CAP_SYS_ADMIN, root, or other real init-namespace privileges beyond the assigned device.\nUI:N - No victim interaction is required beyond the attacker (or their guest) issuing channel-I/O start requests with a malicious channel program; exploitation does not depend on another user mounting media, accepting prompts, or performing administrative actions at trigger time.\nS:C - The leaked ccwchain, CCW, and page_array allocations are host kernel slab memory; a guest VM triggering this through passthrough crosses the guest-host virtualization boundary by consuming host resources the guest security domain should not affect.\nC:N - This is a kernel memory leak on the cp_init() error path, not a use-after-free, out-of-bounds read, or other memory corruption; leaked objects are orphaned in kernel heap and are not returned to userspace or the guest, so no information disclosure occurs.\nI:N - The flaw only fails to free kernel allocations when cp_init() errors; it does not corrupt memory, modify guest or host data, or provide write or control-flow primitives, and cp->initialized stays false so cp_free() never runs on the error or close paths.\nA:H - Each failed cp_init() permanently orphans up to CCWCHAIN_COUNT_MAX ccwchain segments (large GFP_DMA allocations), and subsequent cp_init() calls INIT_LIST_HEAD without freeing prior leaks; repeated guest or VFIO I/O requests can exhaust host memory and cause system-wide OOM or severe denial of service."
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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/s390/cio/vfio_ccw_cp.c"
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],
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"versions": [
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{
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"version": "8b515be512a2435bb8aedc6390cbe140167f9eb9",
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"lessThan": "276bd7ed34d56c48c65c43c0b08f2ee77029b2fa",
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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": "8b515be512a2435bb8aedc6390cbe140167f9eb9",
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"lessThan": "f9bcff265556796834122f95de16d52a8375206c",
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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": "8b515be512a2435bb8aedc6390cbe140167f9eb9",
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"lessThan": "17e01e342af74de12899c206dcc9ec90684703aa",
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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": "8b515be512a2435bb8aedc6390cbe140167f9eb9",
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"lessThan": "152fcb74a26804b70909381c6acc90595a0ae1c1",
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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": "8b515be512a2435bb8aedc6390cbe140167f9eb9",
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"lessThan": "6a917199aaf97904f5619afe3dfdacb155b03e8c",
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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": "8b515be512a2435bb8aedc6390cbe140167f9eb9",
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"lessThan": "32e3d364a7b8295120d37e6a6bd433d2de26f748",
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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": "8b515be512a2435bb8aedc6390cbe140167f9eb9",
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"lessThan": "4699b54fada156534cbb39834d47fc9374d7a1f5",
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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": "8b515be512a2435bb8aedc6390cbe140167f9eb9",
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"lessThan": "74186c2968f8f756ac3226b545b598457c910c75",
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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/s390/cio/vfio_ccw_cp.c"
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],
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"versions": [
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{
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"version": "5.3",
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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": "5.3",
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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": "5.10.267",
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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": "5.15.218",
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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": "6.1.185",
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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": "6.6.154",
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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": "6.12.105",
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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": "6.18.46",
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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": "7.1.10",
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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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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"references": [
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},
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{
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"url": "https://git.kernel.org/stable/c/f9bcff265556796834122f95de16d52a8375206c"
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},
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{
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"url": "https://git.kernel.org/stable/c/17e01e342af74de12899c206dcc9ec90684703aa"
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},
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{
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"url": "https://git.kernel.org/stable/c/152fcb74a26804b70909381c6acc90595a0ae1c1"
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},
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{
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"url": "https://git.kernel.org/stable/c/6a917199aaf97904f5619afe3dfdacb155b03e8c"
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},
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{
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"url": "https://git.kernel.org/stable/c/32e3d364a7b8295120d37e6a6bd433d2de26f748"
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{
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"url": "https://git.kernel.org/stable/c/4699b54fada156534cbb39834d47fc9374d7a1f5"
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},
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{
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"url": "https://git.kernel.org/stable/c/74186c2968f8f756ac3226b545b598457c910c75"
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}
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],
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"title": "s390/vfio_ccw: Free all memory if cp_init() fails",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |