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CVE-2026-97926— ufs: validate cylinder group metadata before caching it

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：在缓存之前验证柱面组元数据 直接将柱面组索引和转子（rotor）位置从磁盘上的组复制过来，并在未进行任何检查的情况下将其缓存： 随后，这些值在分配和释放操作中被用作索引： 作为柱面摘要数组的索引，即 。如果该值超过 ，则会超出 分配范围，写入一个 32 位计数值，导致越界访问。 成为位图扫描的起始位置， ，随后 。如果 超出块位图范围，无符号长度 将发生回绕（wrap around）产生一个极大值，导致 函数远远超出柱面组缓冲区边界进行访问。 以相同方式驱动 ino

CVSS 7.0 · High EPSS 0.15% · P4

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 88cccb6beba136b73f0caf80e59457e1b3c0ca1e affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f560a9e33365c460827c735fd86435f9213f1aed affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e4c5cc9688c3e69d07d888853388549ae26c0521 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 58c0c414b2b8d099d33da494a354fa836ca6c10b affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 5902a95066883cf96fa15b2680694fc5dd0c7d11 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 87b12dc360a002eb2d498aa4f01e84347019612d affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< abde9eb33106850dfa367ad3965d3588bb8558d5 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< c9d263be26806d388129fab8c6904bed197fc6af affected
… +10 more rows
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I. Basic Information for CVE-2026-97926

Vulnerability Information
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Vulnerability Title
ufs: validate cylinder group metadata before caching it
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ufs: validate cylinder group metadata before caching it ufs_read_cylinder() copies the cylinder group index and the rotor positions straight from the on-disk group and caches them without any check: ucpi->c_cgx = fs32_to_cpu(sb, ucg->cg_cgx); ucpi->c_rotor = fs32_to_cpu(sb, ucg->cg_rotor); ucpi->c_frotor = fs32_to_cpu(sb, ucg->cg_frotor); ucpi->c_irotor = fs32_to_cpu(sb, ucg->cg_irotor); They are then used as indices during allocation and free: - c_cgx indexes the cylinder summary array as UFS_SB(sb)->fs_cs(ucpi->c_cgx), so a value past s_ncg writes a 32 bit count outside the s_csp allocation. - c_frotor becomes a bitmap scan start, start = c_frotor >> 3, and then length = ((s_fpg + 7) >> 3) - start. A start beyond the block bitmap wraps the unsigned length to a huge value, so ubh_scanc() walks far past the cylinder group buffers. c_irotor drives the inode bitmap the same way. A crafted image can set any of these freely, turning an ordinary allocation into an out of bounds access. Reject a cylinder group whose recorded index does not match the group being read, or whose rotors fall outside the group, before the metadata is cached. Valid filesystems keep cg_cgx equal to the group number and the rotors within the group, so only malformed images are rejected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 88cccb6beba136b73f0caf80e59457e1b3c0ca1e -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-97926

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III. Intelligence Information for CVE-2026-97926

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Patches & Fixes for CVE-2026-97926 (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

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