CVE-2023-53800 (GCVE-0-2023-53800)

Vulnerability from cvelistv5 – Published: 2025-12-09 00:00 – Updated: 2026-08-05 09:16
VLAI
Title
ubi: Fix use-after-free when volume resizing failed
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < bf9875aa7f7d624a8c084425b14bf7e5907ebc30 (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < bf795ebbb9995e2fe7945de71177f01c2f1215dc (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < 9c8be1f165baee53b5a36ea0b3c9281d403a1d0b (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < 35f8d4064e54c18424db2997059d4c0b1d13d093 (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < 53818746e549e61841428892a8d94344494be797 (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < b0c951742348d216f094d16ed4f70ae73db881c0 (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < 3d6378f7056ac7350338f941001162a8f660853c (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < 9af31d6ec1a4be4caab2550096c6bd2ba8fba472 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.22
Unaffected: 0 , < 2.6.22 (semver)
Unaffected: 4.14.308 , ≤ 4.14.* (semver)
Unaffected: 4.19.276 , ≤ 4.19.* (semver)
Unaffected: 5.4.235 , ≤ 5.4.* (semver)
Unaffected: 5.10.173 , ≤ 5.10.* (semver)
Unaffected: 5.15.100 , ≤ 5.15.* (semver)
Unaffected: 6.1.18 , ≤ 6.1.* (semver)
Unaffected: 6.2.5 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/mtd/ubi/vmt.c"
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            {
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              "version": "4.19.276",
              "versionType": "semver"
            },
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              "status": "unaffected",
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              "versionType": "semver"
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.173",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.100",
              "versionType": "semver"
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.18",
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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"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bf9875aa7f7d624a8c084425b14bf7e5907ebc30"
        },
        {
          "url": "https://git.kernel.org/stable/c/bf795ebbb9995e2fe7945de71177f01c2f1215dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c8be1f165baee53b5a36ea0b3c9281d403a1d0b"
        },
        {
          "url": "https://git.kernel.org/stable/c/35f8d4064e54c18424db2997059d4c0b1d13d093"
        },
        {
          "url": "https://git.kernel.org/stable/c/53818746e549e61841428892a8d94344494be797"
        },
        {
          "url": "https://git.kernel.org/stable/c/b0c951742348d216f094d16ed4f70ae73db881c0"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d6378f7056ac7350338f941001162a8f660853c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9af31d6ec1a4be4caab2550096c6bd2ba8fba472"
        }
      ],
      "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": "2026-08-05T09:16:05.119Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-53800",
      "date": "2026-08-06",
      "epss": "0.00137",
      "percentile": "0.03537"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53800\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-09T01:16:51.727\",\"lastModified\":\"2026-06-17T06:46:05.737\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/mtd/ubi/vmt.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"bf9875aa7f7d624a8c084425b14bf7e5907ebc30\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"bf795ebbb9995e2fe7945de71177f01c2f1215dc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"9c8be1f165baee53b5a36ea0b3c9281d403a1d0b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"35f8d4064e54c18424db2997059d4c0b1d13d093\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"53818746e549e61841428892a8d94344494be797\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"b0c951742348d216f094d16ed4f70ae73db881c0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"3d6378f7056ac7350338f941001162a8f660853c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"9af31d6ec1a4be4caab2550096c6bd2ba8fba472\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/mtd/ubi/vmt.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.22\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.22\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.308\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.276\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.235\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.173\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.100\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.18\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2.5\",\"lessThanOrEqual\":\"6.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/35f8d4064e54c18424db2997059d4c0b1d13d093\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3d6378f7056ac7350338f941001162a8f660853c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53818746e549e61841428892a8d94344494be797\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9af31d6ec1a4be4caab2550096c6bd2ba8fba472\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9c8be1f165baee53b5a36ea0b3c9281d403a1d0b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b0c951742348d216f094d16ed4f70ae73db881c0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf795ebbb9995e2fe7945de71177f01c2f1215dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf9875aa7f7d624a8c084425b14bf7e5907ebc30\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:16:24+00:00",
      "cve": "CVE-2023-53800",
      "id": "CVE-2023-53800",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ubi: Fix use-after-free when volume resizing failed",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53800.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.