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CVE-2026-93198— dm-pcache: validate the persisted dirty_tail chain at load

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，以下漏洞已得到修复： dm-pcache：在加载时校验持久化的 dirty_tail 链 回写（writeback）工作线程会跟随持久化的 链。该链是从缓存设备中独立解码出来的，与 所遍历并限制边界的 链相互独立。对于一个经过精心构造的镜像，其介质上的字段仅通过固定种子的 进行校验，攻击者可以让 指向一条由最后 组成的、永不完全终止的链，从而导致 无延迟地反复重新武装（re-arm）自身，陷入无限循环。 修复方案： 在加载时，使用与 相同的跳数上限（hop cap）遍历一次 链。如果在 跳内

AI Predicted 5.8 Difficulty: Hard EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1012 · Query Registry

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0< 8195cf3f4a82ef49d9b0651c507ed0784caf23fb affected
1d57628ff95b32d5cfa8d8f50e07690c161e9cf0< 4822a030929e0e77aa380722dc42e3e4c9edd346 affected
1d57628ff95b32d5cfa8d8f50e07690c161e9cf0< 58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b affected
6.18 affected
< 6.18 unaffected
6.18.52≤ 6.18.* unaffected
7.2.6≤ 7.2.* unaffected
7.3-rc1≤ * unaffected
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I. Basic Information for CVE-2026-93198

Vulnerability Information
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Vulnerability Title
dm-pcache: validate the persisted dirty_tail chain at load
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm-pcache: validate the persisted dirty_tail chain at load The writeback worker follows the persisted dirty_tail chain, which is decoded from the cache device independently of the key_tail chain that cache_replay() walks and bounds. A crafted image, whose on-media fields are authenticated only by a crc32c with a fixed seed, can aim dirty_tail at a chain of last ksets that never terminates, so cache_writeback_fn() re-arms itself with no delay forever. Walk the dirty_tail chain once at load with the same hop cap cache_replay() uses and fail the table load with -EIO if it does not reach an end within n_segs hops.
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 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 ~ 8195cf3f4a82ef49d9b0651c507ed0784caf23fb -
Linux Linux 6.18 -

II. Public POCs for CVE-2026-93198

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III. Intelligence Information for CVE-2026-93198

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Patches & Fixes for CVE-2026-93198 (3)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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