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CVE-2026-53130— fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START

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基金会开源的操作系统Linux所使用的内核。 Linux kernel 2.6.27版本存在安全漏洞，该漏洞源于在omfs文件系统中，对s_sys_blocksize值缺少下界检查，可能导致整数下溢，进而触发从bh->b_data + OMFS_DIR_START起始的大规模内存覆盖，导致内核内存损坏。

CVSS 7.8 · High EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a3ab7155ea21aadc8a4d5687e91b3d876973185e< fbc72f5c645155dc2ed3573243ed20f9913e3a54 affected
a3ab7155ea21aadc8a4d5687e91b3d876973185e< 5822a05a841a10794ad818620dd2af490b0705d3 affected
a3ab7155ea21aadc8a4d5687e91b3d876973185e< 754ff1bea3819a90c6f33cccfc1a299ef7609f07 affected
a3ab7155ea21aadc8a4d5687e91b3d876973185e< 131ea3e57fc22936ed0e2c8330f2e36106172f51 affected
a3ab7155ea21aadc8a4d5687e91b3d876973185e< 79f84af38c9fef9deb0e02c79eb969b5541c2644 affected
a3ab7155ea21aadc8a4d5687e91b3d876973185e< 6561afc38398e3518a29c5eebb975c30468f98a6 affected
a3ab7155ea21aadc8a4d5687e91b3d876973185e< 817f16ed62bc58a168417bfb5e859c2a370bab03 affected
a3ab7155ea21aadc8a4d5687e91b3d876973185e< 0621c385fda1376e967f37ccd534c26c3e511d14 affected
… +10 more rows
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I. Basic Information for CVE-2026-53130

Vulnerability Information
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Vulnerability Title
fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START omfs_fill_super() rejects oversized s_sys_blocksize values (> PAGE_SIZE), but it does not reject values smaller than OMFS_DIR_START (0x1b8 = 440). Later, omfs_make_empty() uses sbi->s_sys_blocksize - OMFS_DIR_START as the length argument to memset(). Since s_sys_blocksize is u32, a crafted filesystem image with s_sys_blocksize < OMFS_DIR_START causes an unsigned underflow there, wrapping to a value near 2^32. That drives a ~4 GiB memset() from bh->b_data + OMFS_DIR_START and overwrites kernel memory far beyond the backing block buffer. Add the corresponding lower-bound check alongside the existing upper-bound check in omfs_fill_super(), so that malformed images are rejected during superblock validation before any filesystem data is processed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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基金会开源的操作系统Linux所使用的内核。 Linux kernel 2.6.27版本存在安全漏洞，该漏洞源于在omfs文件系统中，对s_sys_blocksize值缺少下界检查，可能导致整数下溢，进而触发从bh->b_data + OMFS_DIR_START起始的大规模内存覆盖，导致内核内存损坏。
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 a3ab7155ea21aadc8a4d5687e91b3d876973185e ~ fbc72f5c645155dc2ed3573243ed20f9913e3a54 -
Linux Linux 2.6.27 -

II. Public POCs for CVE-2026-53130

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III. Intelligence Information for CVE-2026-53130

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Patches & Fixes for CVE-2026-53130 (8)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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