161 lines
10 KiB
JSON
161 lines
10 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-2026-31769",
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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": "2026-03-09T15:48:24.140Z",
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"datePublished": "2026-05-01T14:14:58.617Z",
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"dateUpdated": "2026-08-05T12:25:02.500Z"
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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": "2026-08-05T12:25:02.500Z"
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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\ngpib: fix use-after-free in IO ioctl handlers\n\nThe IBRD, IBWRT, IBCMD, and IBWAIT ioctl handlers use a gpib_descriptor\npointer after board->big_gpib_mutex has been released. A concurrent\nIBCLOSEDEV ioctl can free the descriptor via close_dev_ioctl() during\nthis window, causing a use-after-free.\n\nThe IO handlers (read_ioctl, write_ioctl, command_ioctl) explicitly\nrelease big_gpib_mutex before calling their handler. wait_ioctl() is\ncalled with big_gpib_mutex held, but ibwait() releases it internally\nwhen wait_mask is non-zero. In all four cases, the descriptor pointer\nobtained from handle_to_descriptor() becomes unprotected.\n\nFix this by introducing a kernel-only descriptor_busy reference count\nin struct gpib_descriptor. Each handler atomically increments\ndescriptor_busy under file_priv->descriptors_mutex before releasing the\nlock, and decrements it when done. close_dev_ioctl() checks\ndescriptor_busy under the same lock and rejects the close with -EBUSY\nif the count is non-zero.\n\nA reference count rather than a simple flag is necessary because\nmultiple handlers can operate on the same descriptor concurrently\n(e.g. IBRD and IBWAIT on the same handle from different threads).\n\nA separate counter is needed because io_in_progress can be cleared from\nunprivileged userspace via the IBWAIT ioctl (through general_ibstatus()\nwith set_mask containing CMPL), which would allow an attacker to bypass\na check based solely on io_in_progress. The new descriptor_busy\ncounter is only modified by the kernel IO paths.\n\nThe lock ordering is consistent (big_gpib_mutex -> descriptors_mutex)\nand the handlers only hold descriptors_mutex briefly during the lookup,\nso there is no deadlock risk and no impact on IO throughput."
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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 code is reached through local `/dev/gpibN` character-device ioctls such as `IBRD`, `IBWRT`, `IBCMD`, `IBWAIT`, and `IBCLOSEDEV`. There is no network, adjacent, or physical packet-processing entry point for this bug.\nAC:L - The attacker controls both sides of the race by issuing concurrent ioctls on the same GPIB file descriptor and handle. Use-after-free triggering does not depend on conditions outside attacker control once the board is online and accessible.\nPR:L - The vulnerable ioctls do not perform capability checks; a local user with access to the GPIB device node can open a descriptor, run IO or wait operations, and concurrently close it. Administrative privileges are needed for board configuration, but not for the vulnerable open/close/IO path in a configured deployment.\nUI:N - No victim action is required after the attacker has local access to the device. Exploitation is performed entirely by attacker-controlled ioctl calls.\nS:U - The bug is a kernel use-after-free reachable from a local kernel device interface and impacts the same kernel security authority. It does not cross a virtualization, IOMMU, or separate security-scope boundary.\nC:H - This is a kernel heap use-after-free of `struct gpib_descriptor`, and freed object reuse can expose or help derive kernel memory contents. Following the required kernel guidance, use-after-free bugs are scored as high confidentiality impact.\nI:H - The stale descriptor pointer is dereferenced after free and can be overlapped through heap reuse, giving a plausible path to corrupt kernel data or build write/control-flow primitives. Following the required kernel guidance, use-after-free bugs are scored as high integrity impact.\nA:H - The stale pointer can be dereferenced after `kfree()` during IO or wait completion, making kernel oops, panic, or hang plausible. Use-after-free bugs are therefore high availability impact."
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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/gpib/common/gpib_os.c",
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"drivers/gpib/include/gpib_types.h"
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],
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"versions": [
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{
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"version": "9dde4559e93955ccc47d588f7fd051684d55c4e7",
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"lessThan": "cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c",
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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": "9dde4559e93955ccc47d588f7fd051684d55c4e7",
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"lessThan": "28c75dd143ead62e0dfac564c79d251e21d5d74b",
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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": "9dde4559e93955ccc47d588f7fd051684d55c4e7",
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"lessThan": "d1857f8296dceb75d00ab857fc3c61bc00c7f5c6",
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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/gpib/common/gpib_os.c",
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"drivers/gpib/include/gpib_types.h"
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],
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"versions": [
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{
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"version": "6.13",
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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": "6.13",
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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": "6.18.22",
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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": "6.19.12",
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"lessThanOrEqual": "6.19.*",
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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": "7.0",
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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": "6.13",
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"versionEndExcluding": "6.18.22"
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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": "6.13",
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"versionEndExcluding": "6.19.12"
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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": "6.13",
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"versionEndExcluding": "7.0"
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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/cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c"
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},
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{
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"url": "https://git.kernel.org/stable/c/28c75dd143ead62e0dfac564c79d251e21d5d74b"
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},
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{
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"url": "https://git.kernel.org/stable/c/d1857f8296dceb75d00ab857fc3c61bc00c7f5c6"
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}
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],
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"title": "gpib: fix use-after-free in IO ioctl handlers",
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"x_generator": {
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}
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} |