{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-35954", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.135Z", "datePublished": "2024-05-20T09:41:47.944Z", "dateUpdated": "2026-08-05T11:31:11.820Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:31:11.820Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: sg: Avoid sg device teardown race\n\nsg_remove_sfp_usercontext() must not use sg_device_destroy() after calling\nscsi_device_put().\n\nsg_device_destroy() is accessing the parent scsi_device request_queue which\nwill already be set to NULL when the preceding call to scsi_device_put()\nremoved the last reference to the parent scsi_device.\n\nThe resulting NULL pointer exception will then crash the kernel." } ], "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 is entered by opening and closing the `/dev/sgN` character device, i.e. local file/syscall access to the SCSI generic driver. There is no network-facing consumer of `sg_remove_sfp_usercontext()`.\nAC:L - The attacker holds one side of the race directly (it owns the open sg fd and chooses when to `close()`), and can supply the other side by hot-unplugging its own removable SCSI/USB storage or by looping open/close across a hot-unplug; once sg holds the last `scsi_device` reference the ordering bug fires deterministically, and the attempt is freely repeatable.\nPR:L - No capability check exists on this path — only DAC permission on `/dev/sgN`, which is granted to the unprivileged `disk` group on mainstream distros and is world-accessible on many embedded/appliance and storage-software deployments; the device-removal side (physical unplug, transport loss, hypervisor hot-unplug) needs no privilege either.\nUI:N - The attacker performs the `open()`, triggers the device teardown, and performs the final `close()` from its own process; no victim action is required.\nS:U - The use-after-free and the resulting corruption are confined to kernel memory within the same security authority, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - `sg_device_destroy()` dereferences the already-`kfree()`d `struct scsi_device`, and the reclaimed slab can be groomed so the stale `request_queue` pointer aims `blk_trace_remove()`/`blk_put_queue()` at attacker-chosen kernel memory, yielding a leverageable kernel-memory disclosure primitive.\nI:H - The stale pointer loaded from freed memory is used for writes — `mutex_lock(&q->debugfs_mutex)`, `rcu_replace_pointer(q->blk_trace, NULL)`, and `refcount_dec_and_test(&q->refs)` — so a reallocated slab gives a controlled write into kernel memory and a path to control-flow hijack.\nA:H - In the common case the stale value is NULL and `blk_trace_remove(NULL)`/`blk_put_queue(NULL)` immediately oops the kernel, as stated in the fix commit; the crash is repeatable and takes down the whole system." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/scsi/sg.c" ], "versions": [ { "version": "db59133e927916d8a25ee1fd8264f2808040909d", "lessThan": "46af9047523e2517712ae8e71d984286c626e022", "status": "affected", "versionType": "git" }, { "version": "db59133e927916d8a25ee1fd8264f2808040909d", "lessThan": "b0d1ebcc1a9560e494ea9b3ee808540db26c5086", "status": "affected", "versionType": "git" }, { "version": "db59133e927916d8a25ee1fd8264f2808040909d", "lessThan": "27f58c04a8f438078583041468ec60597841284d", "status": "affected", "versionType": "git" }, { "version": "4cc664e59bf2553771e4c9e90f758f7434cfdc22", "status": "affected", "versionType": "git" }, { "version": "6.4.7", "lessThan": "6.5", "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/scsi/sg.c" ], "versions": [ { "version": "6.5", "status": "affected" }, { "version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.28", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.7", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "6.5", "versionEndExcluding": "6.6.28" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.8.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4.7" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/46af9047523e2517712ae8e71d984286c626e022" }, { "url": "https://git.kernel.org/stable/c/b0d1ebcc1a9560e494ea9b3ee808540db26c5086" }, { "url": "https://git.kernel.org/stable/c/27f58c04a8f438078583041468ec60597841284d" } ], "title": "scsi: sg: Avoid sg device teardown race", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-35954", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-05-20T17:01:34.449905Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:34:37.893Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:21:49.126Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/46af9047523e2517712ae8e71d984286c626e022", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/b0d1ebcc1a9560e494ea9b3ee808540db26c5086", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/27f58c04a8f438078583041468ec60597841284d", "tags": [ "x_transferred" ] } ] } ] } }