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CVE-2026-23238— romfs: check sb_set_blocksize() return value

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未检查sb_set_blocksize返回值，可能导致内核崩溃。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a381f0f61b35c8894b0bd0d6acef2d8f9b08b244 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f2521ab1f63a8c244f06a080319e5ff9a2e1bd95 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2c5829cd8fbbc91568c520b666898f57cdcb8cf6 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< cbd9931e6456822067725354d83446c5bb813030 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 9b203b8ddd7359270e8a694d0584743555128e2c affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4b71ad7676564a94ec5f7d18298f51e8ae53db73 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ab7ad7abb3660c58ffffdf07ff3bb976e7e0afa0 affected
2.6.12 affected
… +8 more rows
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I. Basic Information for CVE-2026-23238

Vulnerability Information
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Vulnerability Title
romfs: check sb_set_blocksize() return value
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未检查sb_set_blocksize返回值，可能导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ a381f0f61b35c8894b0bd0d6acef2d8f9b08b244 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-23238

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III. Intelligence Information for CVE-2026-23238

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Patches & Fixes for CVE-2026-23238 (7)

Same Patch Batch · Linux · 2026-03-04 · 9 CVEs total

CVE-2026-23231 7.8 HIGH netfilter: nf_tables: fix use-after-free in nf_tables_addchain()
CVE-2026-23236 7.3 HIGH fbdev: smscufx: properly copy ioctl memory to kernelspace
CVE-2026-23232 Revert "f2fs: block cache/dio write during f2fs_enable_checkpoint()"
CVE-2025-71238 scsi: qla2xxx: Fix bsg_done() causing double free
CVE-2026-23233 f2fs: fix to avoid mapping wrong physical block for swapfile
CVE-2026-23234 f2fs: fix to avoid UAF in f2fs_write_end_io()
CVE-2026-23235 f2fs: fix out-of-bounds access in sysfs attribute read/write
CVE-2026-23237 platform/x86: classmate-laptop: Add missing NULL pointer checks

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23238

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