272 lines
14 KiB
JSON
272 lines
14 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-2024-36890",
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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": "2024-05-30T15:25:07.065Z",
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"datePublished": "2024-05-30T15:28:57.373Z",
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"dateUpdated": "2026-08-05T11:31:52.212Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:31:52.212Z"
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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\nmm/slab: make __free(kfree) accept error pointers\n\nCurrently, if an automatically freed allocation is an error pointer that\nwill lead to a crash. An example of this is in wm831x_gpio_dbg_show().\n\n 171\tchar *label __free(kfree) = gpiochip_dup_line_label(chip, i);\n 172\tif (IS_ERR(label)) {\n 173\t\tdev_err(wm831x->dev, \"Failed to duplicate label\\n\");\n 174\t\tcontinue;\n 175 }\n\nThe auto clean up function should check for error pointers as well,\notherwise we're going to keep hitting issues like this."
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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 cleanup handler is reached by a local `read()` of the debugfs files `/sys/kernel/debug/gpio` or `/sys/kernel/debug/pinctrl/*/pins`, which dispatch to the affected `dbg_show` callbacks. There is no network or remote path into any `__free(kfree)` site that can receive an error pointer.\nAC:L - Both sides of the trigger are attacker-controlled: the attacker drives system memory pressure to make `kstrdup()` in `gpiochip_dup_line_label()` return `ERR_PTR(-ENOMEM)` while repeatedly reading the debugfs file in a loop, and the resulting bad pointer value is fixed and deterministic rather than layout-dependent.\nPR:L - The kernel creates the gpio debugfs entry mode 0444 under a 0755 debugfs root, so on the many embedded, Android and industrial images that mount debugfs permissively an ordinary unprivileged local account can read it; no capability check exists on the path.\nUI:N - The attacker performs the debugfs read and the memory-pressure generation entirely on their own; no victim process, mount, or administrator action is required.\nS:U - The corruption is confined to the kernel's own slab allocator and page refcounts within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `kfree()` resolves the error pointer to a real populated `struct page` and either drops a refcount on an unrelated live page or splices a wild pointer onto a live slab freelist, so a subsequent allocation can hand out a pointer aliasing arbitrary kernel memory and disclose its contents.\nI:H - The same slab freelist poisoning gives a controlled kernel write when the wild pointer is later returned by `kmalloc()` and written to, and `folio_put()` on an in-use folio yields a page-level use-after-free — both are standard primitives for control-flow hijack.\nA:H - In the common case `virt_to_folio()` on `ERR_PTR(-ENOMEM)` dereferences bogus page metadata and the subsequent free corrupts allocator state, producing an immediate oops or a later panic, and it can be re-triggered on every read of the debugfs file."
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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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"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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"include/linux/slab.h"
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