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CVE-2026-89510— RDMA/cxgb4: Cancel reg_work before freeing device on remove

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存在安全漏洞，该漏洞源于RDMA/cxgb4在移除设备前未取消reg_work，导致c4iw_register_device()访问已释放的设备，可能造成释放后重用。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1097

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5< e6e79e7be87c5ea92728060a3d7fb56890a91e45 affected
1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5< 672ee1981db10569ec96030bddb322f18382ec04 affected
1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5< 4681e731db07769846901cfabdd3e53f765eb9d3 affected
1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5< 3265d558dfafab8f12f5fba06ebbf15cae9f3225 affected
1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5< fe9c591026c576d8b1f72aab5e4cd67350530763 affected
1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5< 85f438382a865a4dc4c50e6b884310bb2b60fc4d affected
1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5< 320e5258a53af0abc5abd9eb01519a48bab2dee8 affected
1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5< a7100601aa1a39f799a566acce10db20eaf4b7f2 affected
… +10 more rows
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I. Basic Information for CVE-2026-89510

Vulnerability Information
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Vulnerability Title
RDMA/cxgb4: Cancel reg_work before freeing device on remove
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/cxgb4: Cancel reg_work before freeing device on remove c4iw_uld_state_change() queues reg_work to register the RDMA device. c4iw_remove() can free ctx->dev while this work is pending or running, leaving c4iw_register_device() accessing the freed device. Cancel reg_work before removing the device. The registration work can tear down ctx->dev when registration fails, so do not unregister or deallocate it again in that case. This issue was found by an in-house static analysis tool.
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存在安全漏洞，该漏洞源于RDMA/cxgb4在移除设备前未取消reg_work，导致c4iw_register_device()访问已释放的设备，可能造成释放后重用。
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 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 ~ e6e79e7be87c5ea92728060a3d7fb56890a91e45 -
Linux Linux 4.15 -

II. Public POCs for CVE-2026-89510

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III. Intelligence Information for CVE-2026-89510

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Patches & Fixes for CVE-2026-89510 (7)

Other References for CVE-2026-89510 (1)

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-2026-89510

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