CVE-2023-53800
Description
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:
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
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
A use-after-free bug in the Linux kernel's UBI subsystem can be triggered by a failed volume resize operation, leading to memory corruption.
Root
Cause
When resizing a UBI volume, the kernel allocates a new EBA (eraseblock association) table (new_eba_tbl) and, upon success, replaces the volume's current table via ubi_eba_replace_table(). However, if the subsequent call to ubi_change_vtbl_record() fails, the error-handling path frees new_eba_tbl even though it has already been assigned to vol->eba_tbl. This creates a dangling pointer, because the lifecycle of the table and the volume structure become mismatched.
The KASAN report shows that a subsequent ubi_resize_volume() operation accesses the freed table in ubi_eba_copy_table, causing a use-after-free read [1] [2] [3].
AI Insight generated on May 19, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
2Patches
8bf9875aa7f7dbf795ebbb9999c8be1f165ba35f8d4064e5453818746e549b0c9517423483d6378f7056a9af31d6ec1a4Vulnerability mechanics
Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
8- git.kernel.org/stable/c/35f8d4064e54c18424db2997059d4c0b1d13d093nvd
- git.kernel.org/stable/c/3d6378f7056ac7350338f941001162a8f660853cnvd
- git.kernel.org/stable/c/53818746e549e61841428892a8d94344494be797nvd
- git.kernel.org/stable/c/9af31d6ec1a4be4caab2550096c6bd2ba8fba472nvd
- git.kernel.org/stable/c/9c8be1f165baee53b5a36ea0b3c9281d403a1d0bnvd
- git.kernel.org/stable/c/b0c951742348d216f094d16ed4f70ae73db881c0nvd
- git.kernel.org/stable/c/bf795ebbb9995e2fe7945de71177f01c2f1215dcnvd
- git.kernel.org/stable/c/bf9875aa7f7d624a8c084425b14bf7e5907ebc30nvd
News mentions
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