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-2026-99156",
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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": "2026-09-25T10:25:14.397Z",
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"datePublished": "2026-10-28T10:35:10.493Z",
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"dateUpdated": "2026-10-31T12:44:14.895Z"
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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": "2026-10-31T12:44:14.895Z"
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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\nscsi: st: Fix use-after-free race between st_remove() and st_open()\n\nst_remove() drops the probe reference on the scsi_tape with kref_put()\nand only afterwards removes its index from st_index_idr. If that was the\nlast reference, scsi_tape_release() frees the structure while it is\nstill published in the idr.\n\nscsi_tape_get(), called from st_open(), looks up the tape in\nst_index_idr and takes a reference under st_ref_mutex and\nst_index_lock. remove_cdevs() does not wait for opens that are already\npast chrdev_open(), so an open that is blocked on st_ref_mutex while\nst_remove() holds it can take the mutex as soon as st_remove() drops it,\nfind the freed tpnt in the idr and call kref_get() on it:\n\n BUG: KASAN: slab-use-after-free in st_open\n Write of size 4 ...\n st_open (drivers/scsi/st.c:254 drivers/scsi/st.c:1291)\n chrdev_open\n ...\n Freed by task ...:\n kfree\n st_remove (drivers/scsi/st.c:4512)\n\nRemove the index from the idr before dropping the reference, all under\nst_ref_mutex. A concurrent scsi_tape_get() now either runs first and\nholds a valid reference that keeps the tape alive, or runs afterwards\nand finds nothing, so st_open() fails with -ENXIO.\n\nThis restores the ordering st_remove() had before the conversion to\nst_index_idr, where the tape was unpublished from scsi_tapes[] before\nthe final kref_put()."
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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 - A local openat() reaches st_open() through chrdev_open(), then scsi_tape_get(); concurrent hot-unplug reaches the patched st_remove() through __scsi_remove_device(), with no network-supplied input.\nAC:L - A tape-device user controlling a hotpluggable TYPE_TAPE device can flood /dev/stN opens while disconnecting it, controlling both st_open() and st_remove() and retrying the race at will.\nPR:L - st_open() and scsi_tape_get() perform no capability check; may_open() applies device-node DAC and device-cgroup policy, so a tape-group user controlling an external tape needs no init-namespace administrative privilege.\nUI:N - The attacker performs both the /dev/stN open flood and device disconnect; no separate victim must open the tape, remove it, or mount attacker-supplied content.\nS:U - The freed scsi_tape object and subsequent corruption remain within the host kernel's SCSI-tape authority, without crossing a VM, IOMMU, or sandbox security boundary.\nC:H - st_remove() leaves a freed kmalloc-1k scsi_tape in st_index_idr; scsi_tape_get() reads its device pointer and st_open() follows buffer and mode pointers from reclaimable storage, enabling kernel-memory disclosure.\nI:H - kref_get() performs a confirmed four-byte write into the freed scsi_tape, and successful reclamation exposes further st_open() writes through in_use, state, and buffer fields, supporting control-flow hijacking.\nA:H - The stale device and buffer pointers are subsequently dereferenced by scsi_device_get() and st_open() buffer handling; the reported UAF proceeds to unrelated corruption, oops/GPF, and kernel panic."
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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/scsi/st.c"
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],
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"versions": [
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{
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"version": "6c648d95a6af4a79241a916871df17c84c68ea20",
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"status": "affected",
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"status": "affected",
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"lessThan": "18a0e3733ce38718688e813e5e2d1106bd4830e5",
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"status": "affected",
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{
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"version": "6c648d95a6af4a79241a916871df17c84c68ea20",
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"lessThan": "71caf7f84bd62a4bf91cc95abd2de690afb8d15f",
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"status": "affected",
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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/scsi/st.c"
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],
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"versions": [
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{
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"version": "3.7",
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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": "3.7",
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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": "5.10.273",
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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": "5.15.224",
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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": "6.1.191",
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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": "6.6.161",
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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": "6.12.115",
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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": "6.18.59",
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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": "7.2.13",
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/7d7f9d2ee4b0841f3eba9fa3627044ad329428de"
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},
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{
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"url": "https://git.kernel.org/stable/c/d9517fc39ec3ee13eadefdc17f45300f7d23ed8c"
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},
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{
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"url": "https://git.kernel.org/stable/c/e7a5da4a4820210aa7d7cd8e6eb25aabe9e5b5a7"
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},
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{
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"url": "https://git.kernel.org/stable/c/00ff1128123d4bdfacd28d68fb4b6e6f657a3648"
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},
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{
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"url": "https://git.kernel.org/stable/c/5ef230f734e0d23db007c8405f38b7e226740084"
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},
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{
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"url": "https://git.kernel.org/stable/c/a1647b653549ff29f0422a63eabf329b842f3822"
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},
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{
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"url": "https://git.kernel.org/stable/c/18a0e3733ce38718688e813e5e2d1106bd4830e5"
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},
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{
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"url": "https://git.kernel.org/stable/c/71caf7f84bd62a4bf91cc95abd2de690afb8d15f"
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}
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],
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"title": "scsi: st: Fix use-after-free race between st_remove() and st_open()",
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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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} |