CVE-2026-23238

Katalog CVE

CVSS 5.5 · Medium EPSS 0,20%

Kerentanan Reachable Assertion pada linux kernel. Skor CVSS 3.1 5.5 (Medium) menurut NVD.

Deskripsi (NVD)

In the Linux kernel, the following vulnerability has been resolved: romfs: check sb_set_blocksize() return value romfs_fill_super() ignores the return value of sb_set_blocksize(), which can fail if the requested block size is incompatible with the block device's configuration. This can be triggered by setting a loop device's block size larger than PAGE_SIZE using ioctl(LOOP_SET_BLOCK_SIZE, 32768), then mounting a romfs filesystem on that device. When sb_set_blocksize(sb, ROMBSIZE) is called with ROMBSIZE=4096 but the device has logical_block_size=32768, bdev_validate_blocksize() fails because the requested size is smaller than the device's logical block size. sb_set_blocksize() returns 0 (failure), but romfs ignores this and continues mounting. The superblock's block size remains at the device's logical block size (32768). Later, when sb_bread() attempts I/O with this oversized block size, it triggers a kernel BUG in folio_set_bh(): kernel BUG at fs/buffer.c:1582! BUG_ON(size > PAGE_SIZE); Fix by checking the return value of sb_set_blocksize() and failing the mount with -EINVAL if it returns 0.

Rincian

Terbit di NVD

4 Maret 2026

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

5.5 (Medium), sumber NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-617: Reachable Assertion

EPSS (30 hari)

0,20% peluang dieksploitasi; lebih tinggi dari 8,7% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/2c5829cd8fbbc91568c520b666898f57cdcb8cf6 patch
• https://git.kernel.org/stable/c/4b71ad7676564a94ec5f7d18298f51e8ae53db73 patch
• https://git.kernel.org/stable/c/9b203b8ddd7359270e8a694d0584743555128e2c patch
• https://git.kernel.org/stable/c/a381f0f61b35c8894b0bd0d6acef2d8f9b08b244 patch
• https://git.kernel.org/stable/c/ab7ad7abb3660c58ffffdf07ff3bb976e7e0afa0 patch
• https://git.kernel.org/stable/c/cbd9931e6456822067725354d83446c5bb813030 patch
• https://git.kernel.org/stable/c/f2521ab1f63a8c244f06a080319e5ff9a2e1bd95 patch
• https://cert-portal.siemens.com/productcert/html/ssa-253495.html