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CVE-2026-53303— f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show()

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 4.17版本存在安全漏洞，该漏洞源于在f2fs_sbi_show()中未加sb_lock读取extension_list、extension_count和hot_ext_count，可能导致并发修改时读取不一致的数据，越界访问或显示陈旧数据。

AI Predicted 4.7 Difficulty: Hard EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux b6a06cbbb5f7fd03589cff9178314af04c568826< d3ff0c121bbaef026df6248ab7ef6f0b068b0647 affected
b6a06cbbb5f7fd03589cff9178314af04c568826< cea15f66b7b68b2c50943a6660e0692c6635e4eb affected
b6a06cbbb5f7fd03589cff9178314af04c568826< 4b3a1bf4c2ffd4c9595d900ead78c9035894a025 affected
b6a06cbbb5f7fd03589cff9178314af04c568826< d0e877810baf613b018fd9747440b9d4d9db1428 affected
b6a06cbbb5f7fd03589cff9178314af04c568826< ea3ab43a1f3cf2c7cecd75c8be1ee99a5e94a92e affected
b6a06cbbb5f7fd03589cff9178314af04c568826< 5909bedbed38c558bee7cb6758ceedf9bc3a9194 affected
4.17 affected
< 4.17 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-53303

Vulnerability Information
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Vulnerability Title
f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show() In f2fs_sbi_show(), the extension_list, extension_count and hot_ext_count are read without holding sbi->sb_lock. If a concurrent sysfs store modifies the extension list via f2fs_update_extension_list(), the show path may read inconsistent count and array contents, potentially leading to out-of-bounds access or displaying stale data. Fix this by holding sb_lock around the entire extension list read and format operation.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel 4.17版本存在安全漏洞，该漏洞源于在f2fs_sbi_show()中未加sb_lock读取extension_list、extension_count和hot_ext_count，可能导致并发修改时读取不一致的数据，越界访问或显示陈旧数据。
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 b6a06cbbb5f7fd03589cff9178314af04c568826 ~ d3ff0c121bbaef026df6248ab7ef6f0b068b0647 -
Linux Linux 4.17 -

II. Public POCs for CVE-2026-53303

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III. Intelligence Information for CVE-2026-53303

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Patches & Fixes for CVE-2026-53303 (5)

Same Patch Batch · Linux · 2026-06-26 · 47 CVEs total

CVE-2026-53309 9.8 CRITICAL ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison
CVE-2026-53281 8.8 HIGH iommu/vt-d: Avoid NULL pointer dereference or refcount corruption
CVE-2026-53322 8.8 HIGH vfio/pci: Clean up DMABUFs before disabling function
CVE-2026-53300 7.8 HIGH net: enetc: fix NTMP DMA use-after-free issue
CVE-2026-53290 7.8 HIGH drm/xe/eustall: Fix drm_dev_put called before stream disable in close
CVE-2026-53284 7.5 HIGH btrfs: only release the dirty pages io tree after successful writes
CVE-2026-53324 net: mana: Use pci_name() for debugfs directory naming
CVE-2026-53306 tty: hvc_iucv: fix off-by-one in number of supported devices
CVE-2026-53319 blk-wbt: remove WARN_ON_ONCE from wbt_init_enable_default()
CVE-2026-53321 io_uring/napi: cap busy_poll_to 10 msec
CVE-2026-53320 nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()
CVE-2026-53323 net: dsa: remove redundant netdev_lock_ops() from conduit ethtool ops
CVE-2026-53313 drm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths
CVE-2026-53312 iommu/riscv: Remove overflows on the invalidation path
CVE-2026-53311 fuse: fix uninit-value in fuse_dentry_revalidate()
CVE-2026-53310 soc/tegra: cbb: Fix cross-fabric target timeout lookup
CVE-2026-53308 power: supply: max77705: Free allocated workqueue and fix removal order
CVE-2026-53307 pinctrl: pinconf-generic: Fully validate 'pinmux' property
CVE-2026-53305 usb: typec: ps883x: Fix Oops at unbind
CVE-2026-53301 reset: amlogic: t7: Fix null reset ops

Showing top 20 of 47 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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