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CVE-2026-89717— zram: set default primary compressor in zram_destroy_comps()

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： zram：在 zram_destroy_comps() 中设置默认的主压缩器 该补丁属于补丁系列“zram：修复 sashiko 报告的 zram 问题”。 sashiko 经过审查并报告了 [1] 几个 zram 问题： 由于缺少 winbits 范围校验，zlib 代码中可能触发 BUG_ON()； zcomp 中可能存在空指针解引用问题。 这两个问题风险较低，但仍值得修复。 本补丁（2/2）： 会重置所有压缩器并将它们设置为 NULL，其中包括主压缩器。这会导致无

AI Predicted 5.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 486fd58af7ac1098b68370b1d4d9f94a2a1c7124< 5cec3e60e9f2d1324179df3aa91656f90095cf8f affected
486fd58af7ac1098b68370b1d4d9f94a2a1c7124< dea8f13c3dfad8b990f8ea96c997aabeebbc1d22 affected
486fd58af7ac1098b68370b1d4d9f94a2a1c7124< dde75313eed0b014c437f48dd75c0308b592cbf9 affected
6e20720b12299595154857fa98222729f0d5823c affected
c4e5683c3031a33dc46954e99d37cbd2f706cdb6 affected
6.6.57< 6.7 affected
6.11.4< 6.12 affected
6.12 affected
… +4 more rows
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I. Basic Information for CVE-2026-89717

Vulnerability Information
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Vulnerability Title
zram: set default primary compressor in zram_destroy_comps()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: zram: set default primary compressor in zram_destroy_comps() Patch series "zram: fix zram issues reported by sashiko". Sashiko drove by and reported [1] a couple of zram issues: a possible BUG_ON() in zlib code due to missing winbits range validation and one possible NULL-ptr dereference in zcomp. Both are low risk yet still worth fixing. This patch (of 2): zram_destroy_comps() resets all compressors and leaves them set to NULL, including the primary one, which is invalid device state, as now comp_algorithm_show()->strcmp() can be called on a NULL compressor. Set default primary compressor in zram_destroy_comps().
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 486fd58af7ac1098b68370b1d4d9f94a2a1c7124 ~ 5cec3e60e9f2d1324179df3aa91656f90095cf8f -
Linux Linux 6.12 -

II. Public POCs for CVE-2026-89717

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III. Intelligence Information for CVE-2026-89717

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Patches & Fixes for CVE-2026-89717 (3)

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

CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89477 sctp: fix NULL deref on untransmitted RECONF completion
CVE-2026-89478 sctp: drop a chunk if its transport was removed
CVE-2026-89479 sctp: stop processing a packet once its association is deleted
CVE-2026-89480 nvme-tcp: reject a read that transferred too few bytes
CVE-2026-89482 nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89481 nvme-tcp: fix host memory disclosure on R2T for a read command
CVE-2026-89483 nvme: zero the discard fallback page
CVE-2026-89484 lockd: fix NULL dereference on lockowner allocation failure
CVE-2026-89485 lockd: pin next file across nlm_inspect_file lock-drop
CVE-2026-89486 ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
CVE-2026-89487 openvswitch: only skb_tx_error() a packet we are about to drop
CVE-2026-89488 openvswitch: Fix CT limit teardown use-after-free
CVE-2026-89489 openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
CVE-2026-89500 ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
CVE-2026-89497 orangefs: skip leading spaces before parsing client debug masks
CVE-2026-89498 orangefs: fix double-free of trailer_buf on readdir copy failure
CVE-2026-89499 ring-buffer: Stop remote reader update when page swap fails
CVE-2026-89496 ocfs2: always run deallocs on copy-on-write completion
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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