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CVE-2026-97927— ufs: create the root dentry after loading cylinder metadata

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.

在 Linux 内核中，已修复以下漏洞： ufs：在加载柱面元数据之后再创建根目录项（dentry） 在加载用于可写挂载的柱面组结构之前，就已安装了 ： 当 失败时，错误处理路径会释放内核中的超级块信息，并将 设置为 NULL，但此时 仍被安装。随后， 会调用 。由于 存在， 会调用 和 操作。这两个操作都会解引用 ，而此时该指针已为 NULL。因此，仅因读取柱面组失败而导致的挂载错误，在清理阶段会导致 oops（内核崩溃）。一个精心构造的镜像，其第一个柱面组无法被读取，会触发此路径。 先加载柱面组元数据，最后再创

AI Predicted 5.9 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e58db6c2dce6e453dca26c3a4953002425201880 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 05360c6eb8388bb5adac3c439ffb1512de39550a affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 5cc48633fb76196b596a449ba1f4f642ad6125ce affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< cd21f1ff74b1c15077fa3b98e80da3b41055aae4 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a9804121d55aaa4319c1cac00b99794aa177dd6a affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 785e523b6c1931d802cab9f85912f3e6c7028af1 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 8173e051a8acbb4ae6547be0436727944119e0b5 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 55a4c98abb9694b067c6a031d11501f06b6b523c affected
… +10 more rows
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I. Basic Information for CVE-2026-97927

Vulnerability Information
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Vulnerability Title
ufs: create the root dentry after loading cylinder metadata
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ufs: create the root dentry after loading cylinder metadata ufs_fill_super() installed sb->s_root before it loaded the cylinder group structures for a writable mount: sb->s_root = d_make_root(inode); ... if (!sb_rdonly(sb)) if (!ufs_read_cylinder_structures(sb)) goto failed; When ufs_read_cylinder_structures() failed, the error path freed the in-core superblock information and set sb->s_fs_info to NULL while sb->s_root stayed installed. get_tree_bdev() then reached deactivate_locked_super(), and because s_root was present, generic_shutdown_super() called sync_filesystem() and the put_super operation. Both dereference UFS_SB(sb), which is now NULL, so a mount that fails only while reading the cylinder groups oopses during teardown. A crafted image whose first cylinder group cannot be read reaches this path. Load the cylinder group metadata first and create the root dentry last, so the superblock is published to the VFS only once it is fully set up. ufs_setup_cstotal() and ufs_read_cylinder_structures() take only the super_block and do not use the root inode, so the reordering is safe.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ e58db6c2dce6e453dca26c3a4953002425201880 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-97927

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III. Intelligence Information for CVE-2026-97927

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Patches & Fixes for CVE-2026-97927 (8)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98122 7.8 HIGH vxlan: mdb: Fix use-after-free in vxlan_mdb_remote_src_del()
CVE-2026-97575 7.8 HIGH media: v4l2-ctrls: validate AV1 tile counts
CVE-2026-97576 7.8 HIGH media: v4l2-ctrls: validate HEVC tile counts
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
CVE-2026-98116 7.8 HIGH ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF
CVE-2026-97580 7.8 HIGH media: rkvdec: bound HEVC tile loops and PPS id to the array capacity
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-97927

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