{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53800", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-08T23:58:35.275Z", "datePublished": "2025-12-09T00:00:56.507Z", "dateUpdated": "2026-08-05T09:16:05.119Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:16:05.119Z" }, "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 \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 \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->eba_tbl\" in ubi_eba_replace_table(). It means that the liftcycle\nof \"vol->eba_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": { "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 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 — `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->eba_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's 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->eba_tbl->entries[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->eba_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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/mtd/ubi/vmt.c" ], "versions": [ { "version": "801c135ce73d5df1caf3eca35b66a10824ae0707", "lessThan": "bf9875aa7f7d624a8c084425b14bf7e5907ebc30", "status": "affected", "versionType": "git" }, { "version": "801c135ce73d5df1caf3eca35b66a10824ae0707", "lessThan": "bf795ebbb9995e2fe7945de71177f01c2f1215dc", "status": "affected", "versionType": "git" }, { "version": "801c135ce73d5df1caf3eca35b66a10824ae0707", "lessThan": "9c8be1f165baee53b5a36ea0b3c9281d403a1d0b", "status": "affected", "versionType": "git" }, { "version": "801c135ce73d5df1caf3eca35b66a10824ae0707", "lessThan": "35f8d4064e54c18424db2997059d4c0b1d13d093", "status": "affected", "versionType": "git" }, { "version": "801c135ce73d5df1caf3eca35b66a10824ae0707", "lessThan": "53818746e549e61841428892a8d94344494be797", "status": "affected", "versionType": "git" }, { "version": "801c135ce73d5df1caf3eca35b66a10824ae0707", "lessThan": "b0c951742348d216f094d16ed4f70ae73db881c0", "status": "affected", "versionType": "git" }, { "version": "801c135ce73d5df1caf3eca35b66a10824ae0707", "lessThan": "3d6378f7056ac7350338f941001162a8f660853c", "status": "affected", "versionType": "git" }, { "version": "801c135ce73d5df1caf3eca35b66a10824ae0707", "lessThan": "9af31d6ec1a4be4caab2550096c6bd2ba8fba472", "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/mtd/ubi/vmt.c" ], "versions": [ { "version": "2.6.22", "status": "affected" }, { "version": "0", "lessThan": "2.6.22", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.308", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.276", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.235", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.173", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.100", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.18", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2.5", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3", "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": "2.6.22", "versionEndExcluding": "4.14.308" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "4.19.276" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "5.4.235" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "5.10.173" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "5.15.100" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.1.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.3" } ] } ] } ], "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" } } } }