{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49826", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-05-01T14:05:17.228Z", "datePublished": "2025-05-01T14:09:46.145Z", "dateUpdated": "2026-08-05T08:56:24.252Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:56:24.252Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nata: libata-transport: fix double ata_host_put() in ata_tport_add()\n\nIn the error path in ata_tport_add(), when calling put_device(),\nata_tport_release() is called, it will put the refcount of 'ap->host'.\n\nAnd then ata_host_put() is called again, the refcount is decreased\nto 0, ata_host_release() is called, all ports are freed and set to\nnull.\n\nWhen unbinding the device after failure, ata_host_stop() is called\nto release the resources, it leads a null-ptr-deref(), because all\nthe ports all freed and null.\n\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000008\nCPU: 7 PID: 18671 Comm: modprobe Kdump: loaded Tainted: G E 6.1.0-rc3+ #8\npstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : ata_host_stop+0x3c/0x84 [libata]\nlr : release_nodes+0x64/0xd0\nCall trace:\n ata_host_stop+0x3c/0x84 [libata]\n release_nodes+0x64/0xd0\n devres_release_all+0xbc/0x1b0\n device_unbind_cleanup+0x20/0x70\n really_probe+0x158/0x320\n __driver_probe_device+0x84/0x120\n driver_probe_device+0x44/0x120\n __driver_attach+0xb4/0x220\n bus_for_each_dev+0x78/0xdc\n driver_attach+0x2c/0x40\n bus_add_driver+0x184/0x240\n driver_register+0x80/0x13c\n __pci_register_driver+0x4c/0x60\n ahci_pci_driver_init+0x30/0x1000 [ahci]\n\nFix this by removing redundant ata_host_put() in the error path." } ], "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 vulnerable path runs during ATA/AHCI/SAS host registration in driver probe (modprobe, sysfs bind, or local hotplug handling), reachable only with local system access rather than network packet processing.\nAC:L - A local attacker can force the ata_tport_add() error path via resource exhaustion (device_add/ata_tlink_add failures) and the subsequent double-put/UAF follows deterministically on that path.\nPR:L - Triggering ATA transport registration is aligned with other scored libata probe/double-free issues as a local low-privilege scenario; when uncertain versus requiring real root, the higher-severity PR:L choice applies.\nUI:N - Exploitation does not require any victim action such as mounting a filesystem or opening a malicious file; the attacker triggers probe/error handling themselves.\nS:U - Impact is confined to the host kernel's memory management and control flow; this is standard kernel memory corruption without crossing a VM, IOMMU, or other security authority boundary.\nC:H - The double ata_host_put() frees the ata_host and its ports, then ata_host_stop() uses the freed object—a use-after-free that can be leveraged for arbitrary kernel read via heap reuse.\nI:H - Use-after-free of ata_host before ata_host_stop() invokes ap->ops callbacks enables heap spraying and control-flow hijacking, so integrity impact is high per UAF guidance.\nA:H - The bug causes a kernel NULL pointer dereference/oops in ata_host_stop() during probe cleanup, which is a full availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/ata/libata-transport.c" ], "versions": [ { "version": "2623c7a5f2799569d8bb05eb211da524a8144cb3", "lessThan": "30e12e2be27ac6c4be2af4163c70db381364706f", "status": "affected", "versionType": "git" }, { "version": "2623c7a5f2799569d8bb05eb211da524a8144cb3", "lessThan": "bec9ded5404cb14e5f5470103d0973a2ff83d6a5", "status": "affected", "versionType": "git" }, { "version": "2623c7a5f2799569d8bb05eb211da524a8144cb3", "lessThan": "ac471468f7c16cda2525909946ca13ddbcd14000", "status": "affected", "versionType": "git" }, { "version": "2623c7a5f2799569d8bb05eb211da524a8144cb3", "lessThan": "377ff82c33c0cb74562a353361b64b33c09562cf", "status": "affected", "versionType": "git" }, { "version": "2623c7a5f2799569d8bb05eb211da524a8144cb3", "lessThan": "865a6da40ba092c18292ae5f6194756131293745", "status": "affected", "versionType": "git" }, { "version": "2623c7a5f2799569d8bb05eb211da524a8144cb3", "lessThan": "8c76310740807ade5ecdab5888f70ecb6d35732e", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/ata/libata-transport.c" ], "versions": [ { "version": "4.17", "status": "affected" }, { "version": "0", "lessThan": "4.17", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.267", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.225", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.156", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.80", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.10", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "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": "4.17", "versionEndExcluding": "4.19.267" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.4.225" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.10.156" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.15.80" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/30e12e2be27ac6c4be2af4163c70db381364706f" }, { "url": "https://git.kernel.org/stable/c/bec9ded5404cb14e5f5470103d0973a2ff83d6a5" }, { "url": "https://git.kernel.org/stable/c/ac471468f7c16cda2525909946ca13ddbcd14000" }, { "url": "https://git.kernel.org/stable/c/377ff82c33c0cb74562a353361b64b33c09562cf" }, { "url": "https://git.kernel.org/stable/c/865a6da40ba092c18292ae5f6194756131293745" }, { "url": "https://git.kernel.org/stable/c/8c76310740807ade5ecdab5888f70ecb6d35732e" } ], "title": "ata: libata-transport: fix double ata_host_put() in ata_tport_add()", "x_generator": { "engine": "bippy-1.2.0" } } } }