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CVE-2026-89606— ecryptfs: reject too-small tag 70 packets

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基金会开源的一个操作系统内核。 Linux kernel 2.6.29版本存在安全漏洞，该漏洞源于ecryptfs_parse_tag_70_packet()未验证tag 70数据包体大小，当数据包体小于固定元数据字段时，从数据包体大小中减去固定元数据字段可能导致整数下溢。

CVSS 7.8 · High EPSS 0.14% · P3

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 9c79f34f7ee71cd28272332b424ca64b2be006ab< df5f375a6151ef71f636da044bcef90c26697255 affected
9c79f34f7ee71cd28272332b424ca64b2be006ab< 5668121974eb7f7aa82793a9d0d13abadb8904dc affected
9c79f34f7ee71cd28272332b424ca64b2be006ab< 2e5afed9503dd1d85004c09503adc2cb584c0188 affected
9c79f34f7ee71cd28272332b424ca64b2be006ab< 414a0f04feb06f03523edf7e2a8be1d7f1a9b160 affected
9c79f34f7ee71cd28272332b424ca64b2be006ab< 9d88391bbed76eb091cddd50b0af87b1c6f22589 affected
9c79f34f7ee71cd28272332b424ca64b2be006ab< b31da1ecf13929a8d7f8d2727843d2fe35396b75 affected
9c79f34f7ee71cd28272332b424ca64b2be006ab< d2869768eab5648e6edc05f47e0716e5328e6681 affected
9c79f34f7ee71cd28272332b424ca64b2be006ab< e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7f affected
… +10 more rows
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I. Basic Information for CVE-2026-89606

Vulnerability Information
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Vulnerability Title
ecryptfs: reject too-small tag 70 packets
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ecryptfs: reject too-small tag 70 packets ecryptfs_parse_tag_70_packet() subtracts fixed metadata fields from the parsed packet body size to derive the encrypted filename size. A malformed packet with a body smaller than those fixed fields can underflow that size calculation. Reject tag 70 packets before the subtraction unless the body contains the signature, cipher code, and at least one byte of encrypted filename data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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基金会开源的一个操作系统内核。 Linux kernel 2.6.29版本存在安全漏洞，该漏洞源于ecryptfs_parse_tag_70_packet()未验证tag 70数据包体大小，当数据包体小于固定元数据字段时，从数据包体大小中减去固定元数据字段可能导致整数下溢。
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 9c79f34f7ee71cd28272332b424ca64b2be006ab ~ df5f375a6151ef71f636da044bcef90c26697255 -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2026-89606

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III. Intelligence Information for CVE-2026-89606

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Patches & Fixes for CVE-2026-89606 (8)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89688 9.8 CRITICAL nfsd: drop the stateid, not the stateowner, on seqid_op replay retry
CVE-2026-89656 9.8 CRITICAL libceph: reject buckets with mismatched CRUSH ids
CVE-2026-89655 9.8 CRITICAL ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock
CVE-2026-89658 9.8 CRITICAL NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup
CVE-2026-89660 9.8 CRITICAL NFSD: Prevent client use-after-free during admin state revocation
CVE-2026-89659 9.8 CRITICAL NFSD: Prevent client use-after-free during delegation revoke
CVE-2026-89662 9.8 CRITICAL NFSD: Prevent lock owner use-after-free during client teardown
CVE-2026-89669 9.8 CRITICAL nfsd: initialize copy-notify stateid before publishing it
CVE-2026-89674 9.8 CRITICAL nfsd: fix XDR length calculation in nfsd4_ff_encode_layoutget
CVE-2026-89675 9.8 CRITICAL nfsd: fix UAF in async copy cancel and shutdown
CVE-2026-89676 9.8 CRITICAL nfsd: fix stale s2s_cp_stateids IDR entry for async COPY
CVE-2026-89677 9.8 CRITICAL nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file()
CVE-2026-89681 9.8 CRITICAL nfsd: fix layout fence worker double-reference race
CVE-2026-89686 9.8 CRITICAL nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke
CVE-2026-89703 9.8 CRITICAL nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations
CVE-2026-89479 9.8 CRITICAL sctp: stop processing a packet once its association is deleted
CVE-2026-89478 9.8 CRITICAL sctp: drop a chunk if its transport was removed
CVE-2026-89702 9.8 CRITICAL nfsd: size fh_verify server sockaddr slot by xpt_locallen
CVE-2026-89482 9.8 CRITICAL nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89708 9.8 CRITICAL nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89606

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