CVE-2023-53800 (GCVE-0-2023-53800)
Vulnerability from cvelistv5
Published
2025-12-09 00:00
Modified
2026-10-15 21:41
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ubi: Fix use-after-free when volume resizing failed
There is an use-after-free problem reported by KASAN:
==================================================================
BUG: KASAN: use-after-free in ubi_eba_copy_table+0x11f/0x1c0 [ubi]
Read of size 8 at addr ffff888101eec008 by task ubirsvol/4735
CPU: 2 PID: 4735 Comm: ubirsvol
Not tainted 6.1.0-rc1-00003-g84fa3304a7fc-dirty #14
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.14.0-1.fc33 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0x34/0x44
print_report+0x171/0x472
kasan_report+0xad/0x130
ubi_eba_copy_table+0x11f/0x1c0 [ubi]
ubi_resize_volume+0x4f9/0xbc0 [ubi]
ubi_cdev_ioctl+0x701/0x1850 [ubi]
__x64_sys_ioctl+0x11d/0x170
do_syscall_64+0x35/0x80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
</TASK>
When ubi_change_vtbl_record() returns an error in ubi_resize_volume(),
"new_eba_tbl" will be freed on error handing path, but it is holded
by "vol->eba_tbl" in ubi_eba_replace_table(). It means that the liftcycle
of "vol->eba_tbl" and "vol" are different, so when resizing volume in
next time, it causing an use-after-free fault.
Fix it by not freeing "new_eba_tbl" after it replaced in
ubi_eba_replace_table(), while will be freed in next volume resizing.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 801c135ce73d5df1caf3eca35b66a10824ae0707 Version: 801c135ce73d5df1caf3eca35b66a10824ae0707 Version: 801c135ce73d5df1caf3eca35b66a10824ae0707 Version: 801c135ce73d5df1caf3eca35b66a10824ae0707 Version: 801c135ce73d5df1caf3eca35b66a10824ae0707 Version: 801c135ce73d5df1caf3eca35b66a10824ae0707 Version: 801c135ce73d5df1caf3eca35b66a10824ae0707 Version: 801c135ce73d5df1caf3eca35b66a10824ae0707 |
||
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubi: Fix use-after-free when volume resizing failed\n\nThere is an use-after-free problem reported by KASAN:\n ==================================================================\n BUG: KASAN: use-after-free in ubi_eba_copy_table+0x11f/0x1c0 [ubi]\n Read of size 8 at addr ffff888101eec008 by task ubirsvol/4735\n\n CPU: 2 PID: 4735 Comm: ubirsvol\n Not tainted 6.1.0-rc1-00003-g84fa3304a7fc-dirty #14\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),\n BIOS 1.14.0-1.fc33 04/01/2014\n Call Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x34/0x44\n print_report+0x171/0x472\n kasan_report+0xad/0x130\n ubi_eba_copy_table+0x11f/0x1c0 [ubi]\n ubi_resize_volume+0x4f9/0xbc0 [ubi]\n ubi_cdev_ioctl+0x701/0x1850 [ubi]\n __x64_sys_ioctl+0x11d/0x170\n do_syscall_64+0x35/0x80\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n \u003c/TASK\u003e\n\nWhen ubi_change_vtbl_record() returns an error in ubi_resize_volume(),\n\"new_eba_tbl\" will be freed on error handing path, but it is holded\nby \"vol-\u003eeba_tbl\" in ubi_eba_replace_table(). It means that the liftcycle\nof \"vol-\u003eeba_tbl\" and \"vol\" are different, so when resizing volume in\nnext time, it causing an use-after-free fault.\n\nFix it by not freeing \"new_eba_tbl\" after it replaced in\nubi_eba_replace_table(), while will be freed in next volume resizing."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable code is reached only through `ioctl(UBI_IOCRSVOL)` on the local `/dev/ubiN` character device (`ubi_cdev_ioctl`, cdev.c:972), or via autoresize at device attach. There is no network- or adjacent-reachable path into `ubi_resize_volume()`.\nAC:L - The failing step is attacker-inducible without hardware faults \u2014 `ubi_change_vtbl_record()` propagates `-ENOMEM` from the `GFP_NOFS` allocations in `ubi_eba_atomic_leb_change()` and `ltree_add_entry()`, which memory pressure reliably defeats, and the ioctl can simply be retried until one attempt fails. The resulting dangling `vol-\u003eeba_tbl` persists indefinitely, so the attacker has an unbounded window to groom the kmalloc-8/16 slab before firing the read/write.\nPR:L - The path is gated by `capable(CAP_SYS_RESOURCE)`, a single narrow capability commonly delegated to non-root storage/service accounts on the embedded and IoT systems where UBI is deployed, far short of full administrative control of the system. This matches the CISA-ADP scoring of PR:L for the identical sibling bugs CVE-2022-49388 and CVE-2021-47634 in the same UBI cdev ioctl paths.\nUI:N - The attacker performs the resize ioctl, the memory-pressure setup, the heap spray and the subsequent LEB operation entirely on their own. No victim action or interaction is required at any point.\nS:U - The freed object and all corruption sites lie within the kernel\u0027s own memory and security authority; there is no VM, IOMMU, or sandbox boundary crossed. Exploitation yields kernel privilege escalation within the same authority.\nC:H - Once the freed 8-byte table is reclaimed with sprayed data, the attacker controls the `entries` pointer, and read sites such as `eba.c:108/458/603/953/1026` dereference `entries[lnum].pnum` with an attacker-chosen `lnum`, yielding an arbitrary kernel-memory read primitive.\nI:H - The write sites `vol-\u003eeba_tbl-\u003eentries[lnum].pnum = pnum` (eba.c:466, 528, 862, 975, 1464) become a controlled 4-byte write at an attacker-chosen kernel address once the freed slot is reclaimed, sufficient for control-flow hijack and privilege escalation.\nA:H - Even unexploited, the dangling `vol-\u003eeba_tbl` is dereferenced by every subsequent LEB operation, by the background wear-leveling worker (`ubi_eba_copy_leb`), and by any UBIFS/ubiblock stacked on the volume, producing kernel oops/panic as shown in the KASAN report in the fix commit."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T09:16:05.119Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/bf9875aa7f7d624a8c084425b14bf7e5907ebc30"
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"url": "https://git.kernel.org/stable/c/bf795ebbb9995e2fe7945de71177f01c2f1215dc"
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"url": "https://git.kernel.org/stable/c/b0c951742348d216f094d16ed4f70ae73db881c0"
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{
"url": "https://git.kernel.org/stable/c/9af31d6ec1a4be4caab2550096c6bd2ba8fba472"
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],
"title": "ubi: Fix use-after-free when volume resizing failed",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2023-53800",
"datePublished": "2025-12-09T00:00:56.507Z",
"dateReserved": "2025-12-08T23:58:35.275Z",
"dateUpdated": "2026-10-15T21:41:36.295Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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