122 lines
7.0 KiB
JSON
122 lines
7.0 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-2026-90181",
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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": "2026-09-11T19:38:34.791Z",
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"datePublished": "2026-09-17T16:07:05.725Z",
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"dateUpdated": "2026-10-19T08:59:18.253Z"
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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": "2026-10-19T08:59:18.253Z"
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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\nublk: avoid teardown retry loop on xarray allocation failure\n\n__ublk_shmem_remove_ranges() removes matching maple tree ranges in\nbatches, but first stores each range into a temporary xarray so that the\npages can be unpinned after dropping the maple tree lock.\n\nThat temporary xarray is filled under the maple tree lock with\nxa_store(..., GFP_ATOMIC). If the store fails before mas_erase(), the\ncurrent range is left in the tree and the helper returns false. The\nouter ublk_shmem_remove_ranges() loop then immediately retries the same\nrange. While the atomic allocation keeps failing, the teardown path has\nno forward progress.\n\nThe issue can be reproduced with radix_tree_node failslab injection after\na SHMEM_ZC buffer has already been registered:\n\n # Kernel config:\n # CONFIG_BLK_DEV_UBLK=y\n # CONFIG_DEBUG_FS=y\n # CONFIG_FAULT_INJECTION=y\n # CONFIG_FAULT_INJECTION_DEBUG_FS=y\n # CONFIG_FAILSLAB=y\n\n echo 10 > /proc/sys/vm/nr_hugepages\n mkdir -p /tmp/htlb\n mount -t hugetlbfs none /tmp/htlb\n fallocate -l 4M /tmp/htlb/ublk_buf\n\n dev_id=$(kublk add -t null --shmem_zc \\\n\t\t--htlb /tmp/htlb/ublk_buf |\n\t awk -F '[ :]' '/dev id/ {print $3}')\n\n echo 1 > /sys/kernel/slab/radix_tree_node/failslab\n echo Y > /sys/kernel/debug/failslab/cache-filter\n echo Y > /sys/kernel/debug/failslab/ignore-gfp-wait\n echo 1 > /sys/kernel/debug/failslab/interval\n echo -1 > /sys/kernel/debug/failslab/times\n echo 100 > /sys/kernel/debug/failslab/probability\n\n kublk del -n \"$dev_id\"\n\nOn the unfixed kernel the delete command was still running after 3\nseconds. Disabling failslab made it return. The fault-injection stack\nshowed:\n\n should_failslab\n kmem_cache_alloc_lru_noprof\n __xas_nomem\n __xa_store\n xa_store\n __ublk_shmem_remove_ranges\n ublk_cdev_rel\n ublk_ctrl_del_dev\n\nRemove the allocation from the teardown loop. Keep the existing batch\nlimit, but collect {base_pfn, nr_pages} pairs in a fixed-size stack array.\nOnce a matching range is found, the range is erased from the maple tree\nbefore dropping the lock, so each successful scan makes progress without\ndepending on any GFP_ATOMIC allocation.\n\nWith the same failslab settings, the fixed kernel completed\n\"kublk del -n $dev_id\" successfully in about 45 ms."
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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/block/ublk_drv.c"
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],
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"versions": [
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{
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"version": "309e02dccf64e1b7bd2067abedc270e33b0aadf3",
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"lessThan": "b9cc6cc74daf6fef533dbe65d8cee779fea69600",
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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": "309e02dccf64e1b7bd2067abedc270e33b0aadf3",
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"lessThan": "4fd66a7f829f3f38f92a79081f0f2688aed644f0",
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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/block/ublk_drv.c"
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],
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"versions": [
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{
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"version": "7.1",
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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": "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": "7.2.6",
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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": "7.1",
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"versionEndExcluding": "7.2.6"
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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": "7.1",
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"versionEndExcluding": "7.3"
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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/b9cc6cc74daf6fef533dbe65d8cee779fea69600"
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},
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{
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"url": "https://git.kernel.org/stable/c/4fd66a7f829f3f38f92a79081f0f2688aed644f0"
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}
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],
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"title": "ublk: avoid teardown retry loop on xarray allocation failure",
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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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} |