CVE-2026-72482

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72482", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.935Z", "datePublished": "2026-08-15T05:57:20.247Z", "dateUpdated": "2026-08-17T05:44:45.643Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:44:45.643Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpib: fix double decrement of descriptor_busy in command_ioctl()\n\ncommit d1857f8296dc (\"gpib: fix use-after-free in IO ioctl handlers\")\nintroduced a descriptor_busy reference counter to pin struct\ngpib_descriptor across IO ioctl operations. In command_ioctl(), the\nerror path inside the loop decrements descriptor_busy and breaks, but\nexecution then falls through to the unconditional decrement after the\nloop, underflowing the counter to -1.\n\nThis re-enables the use-after-free that the original fix was meant to\nprevent: a concurrent close_dev_ioctl() sees descriptor_busy == 0 on\nan actively-used descriptor and frees it.\n\nRemove the early decrement from the error path. The post-loop\ndecrement already handles all exit paths, matching the correct pattern\nused in read_ioctl() and write_ioctl()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only through local ioctl on /dev/gpibN character devices; exploitation requires concurrent IBCMD (command_ioctl) and IBCLOSEDEV calls, not remote network traffic or physical GPIB bus manipulation.\nAC:L - Once a GPIB board is online and accessible, an attacker controls both race participants by running a failing IBCMD ioctl in one thread and IBCLOSEDEV on the same handle in another; ibcmd errors (e.g., timeout or missing CIC) are reliably triggerable.\nPR:L - The vulnerable IBCMD and IBCLOSEDEV ioctls perform no capability checks; any local user with access to an already-configured, online GPIB device node can open handles and race command/close operations typical of lab and factory test automation accounts.\nUI:N - No victim interaction is required beyond the attacker already having local access to the GPIB device; exploitation is performed entirely through attacker-controlled ioctl sequences without needing another user to mount, open, or approve actions.\nS:U - This is a kernel heap use-after-free within the GPIB driver reachable from local process ioctls and affects the same kernel security authority; it does not cross virtualization, IOMMU, or separate security-scope boundaries.\nC:H - The erroneous early descriptor_busy decrement lets close_dev_ioctl kfree() the struct while command_ioctl still holds and dereferences it; freed kmalloc slab reuse can expose or help derive kernel memory contents per UAF scoring guidance.\nI:H - Post-free atomic writes to io_in_progress and descriptor_busy on the stale pointer can corrupt attacker-influenced reused heap objects, providing a plausible path to kernel data corruption, write primitives, or privilege escalation.\nA:H - Dereferencing the freed gpib_descriptor during IBCMD completion (atomic_set, atomic_dec, wake_up) can cause kernel oops, BUG, or panic; use-after-free bugs are scored as high availability impact even before full exploitation."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpib/common/gpib_os.c"], "versions": [{"version": "cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c", "lessThan": "fdee9f207a48ce204ec6cfceaa1459d2473600a5", "status": "affected", "versionType": "git"}, {"version": "d1857f8296dceb75d00ab857fc3c61bc00c7f5c6", "lessThan": "8b5f1d295dda8677e4545ce340053fcfa8b634c7", "status": "affected", "versionType": "git"}, {"version": "d1857f8296dceb75d00ab857fc3c61bc00c7f5c6", "lessThan": "c4faab452b3c1ada003d49c477609dd80523b9bf", "status": "affected", "versionType": "git"}, {"version": "28c75dd143ead62e0dfac564c79d251e21d5d74b", "status": "affected", "versionType": "git"}, {"version": "6.18.22", "lessThan": "6.18.40", "status": "affected", "versionType": "semver"}, {"version": "6.19.12", "lessThan": "6.20", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpib/common/gpib_os.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.22", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.12"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/fdee9f207a48ce204ec6cfceaa1459d2473600a5"}, {"url": "https://git.kernel.org/stable/c/8b5f1d295dda8677e4545ce340053fcfa8b634c7"}, {"url": "https://git.kernel.org/stable/c/c4faab452b3c1ada003d49c477609dd80523b9bf"}], "title": "gpib: fix double decrement of descriptor_busy in command_ioctl()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/gpib/common/gpib_os.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "fdee9f207a48ce204ec6cfceaa1459d2473600a5", "status": "affected", "version": "cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c", "versionType": "git"}, {"lessThan": "8b5f1d295dda8677e4545ce340053fcfa8b634c7", "status": "affected", "version": "d1857f8296dceb75d00ab857fc3c61bc00c7f5c6", "versionType": "git"}, {"lessThan": "c4faab452b3c1ada003d49c477609dd80523b9bf", "status": "affected", "version": "d1857f8296dceb75d00ab857fc3c61bc00c7f5c6", "versionType": "git"}, {"status": "affected", "version": "28c75dd143ead62e0dfac564c79d251e21d5d74b", "versionType": "git"}, {"lessThan": "6.18.40", "status": "affected", "version": "6.18.22", "versionType": "semver"}, {"lessThan": "6.20", "status": "affected", "version": "6.19.12", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/gpib/common/gpib_os.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.0"}, {"lessThan": "7.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpib: fix double decrement of descriptor_busy in command_ioctl()\n\ncommit d1857f8296dc (\"gpib: fix use-after-free in IO ioctl handlers\")\nintroduced a descriptor_busy reference counter to pin struct\ngpib_descriptor across IO ioctl operations. In command_ioctl(), the\nerror path inside the loop decrements descriptor_busy and breaks, but\nexecution then falls through to the unconditional decrement after the\nloop, underflowing the counter to -1.\n\nThis re-enables the use-after-free that the original fix was meant to\nprevent: a concurrent close_dev_ioctl() sees descriptor_busy == 0 on\nan actively-used descriptor and frees it.\n\nRemove the early decrement from the error path. The post-loop\ndecrement already handles all exit paths, matching the correct pattern\nused in read_ioctl() and write_ioctl()."}], "id": "CVE-2026-72482", "lastModified": "2026-08-17T06:19:16.347", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:22:22.430", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8b5f1d295dda8677e4545ce340053fcfa8b634c7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c4faab452b3c1ada003d49c477609dd80523b9bf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fdee9f207a48ce204ec6cfceaa1459d2473600a5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: gpib: fix double decrement of descriptor_busy in command_ioctl()", "id": "2516615", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516615"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-911", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ngpib: fix double decrement of descriptor_busy in command_ioctl()\ncommit d1857f8296dc (\"gpib: fix use-after-free in IO ioctl handlers\")\nintroduced a descriptor_busy reference counter to pin struct\ngpib_descriptor across IO ioctl operations. In command_ioctl(), the\nerror path inside the loop decrements descriptor_busy and breaks, but\nexecution then falls through to the unconditional decrement after the\nloop, underflowing the counter to -1.\nThis re-enables the use-after-free that the original fix was meant to\nprevent: a concurrent close_dev_ioctl() sees descriptor_busy == 0 on\nan actively-used descriptor and frees it.\nRemove the early decrement from the error path. The post-loop\ndecrement already handles all exit paths, matching the correct pattern\nused in read_ioctl() and write_ioctl().", "A flaw was found in the `gpib` component of the Linux kernel. A double decrement of a descriptor counter within the `command_ioctl()` function can lead to a counter underflow. This re-enables a use-after-free vulnerability, where a concurrently active descriptor can be prematurely freed. This could result in system instability, a denial of service, or potentially allow for arbitrary code execution."], "name": "CVE-2026-72482", "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72482\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72482\nhttps://lore.kernel.org/linux-cve-announce/2026081537-CVE-2026-72482-ebe4@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cae26eff1b56d78bed7873cf3e60a2b1bdd4da6c,fdee9f207a48ce204ec6cfceaa1459d2473600a5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d1857f8296dceb75d00ab857fc3c61bc00c7f5c6,8b5f1d295dda8677e4545ce340053fcfa8b634c7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d1857f8296dceb75d00ab857fc3c61bc00c7f5c6,c4faab452b3c1ada003d49c477609dd80523b9bf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "28c75dd143ead62e0dfac564c79d251e21d5d74b"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.22,6.18.40)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.19.12,6.20)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T17:45:03.069123+00:00", "updated": "2026-08-22T05:00:13.401259+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}