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CVE-2026-80987— NTB: ntb_transport: Reject oversized TX buffers

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ntb_process_tx()处理超大TX缓冲区时调用tx_handler()并返回成功，导致skb未被释放而内存泄漏，攻击者可利用该漏洞造成内存消耗。

CVSS 7.5 · High EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux fce8a7bb5b4bfb8a27324703fd5b002ee9247e90< 4890152a3069f5cb58cc24b08cfd5fe95e568fa1 affected
fce8a7bb5b4bfb8a27324703fd5b002ee9247e90< 668aa3238548584ca9772da9cf43ae8c2389bbf1 affected
fce8a7bb5b4bfb8a27324703fd5b002ee9247e90< 9b0fa8a9e1057614a533cc3f18b17f82aab028d8 affected
fce8a7bb5b4bfb8a27324703fd5b002ee9247e90< b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88 affected
fce8a7bb5b4bfb8a27324703fd5b002ee9247e90< a7f22105a7df8c7fd74d0af27ace6fa94fe03d87 affected
fce8a7bb5b4bfb8a27324703fd5b002ee9247e90< 6b6bbc6c878d64eacc60877df49fce7b1b6a08d0 affected
fce8a7bb5b4bfb8a27324703fd5b002ee9247e90< 75a604e9f1cfdebda421062fdf42225ca32154cd affected
fce8a7bb5b4bfb8a27324703fd5b002ee9247e90< a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7 affected
… +10 more rows
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I. Basic Information for CVE-2026-80987

Vulnerability Information
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Vulnerability Title
NTB: ntb_transport: Reject oversized TX buffers
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: NTB: ntb_transport: Reject oversized TX buffers ntb_process_tx() handles an oversized buffer by calling tx_handler() with a NULL data pointer and returning success. ntb_netdev therefore neither frees the skb in its completion callback nor takes its enqueue error path, leaking it. Reject oversized buffers in ntb_transport_tx_enqueue() before acquiring a queue entry and return -EMSGSIZE. The caller retains ownership of the buffer, and the preceding netdev patch frees the skb when enqueue returns this permanent error.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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ntb_process_tx()处理超大TX缓冲区时调用tx_handler()并返回成功，导致skb未被释放而内存泄漏，攻击者可利用该漏洞造成内存消耗。
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 fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 ~ 4890152a3069f5cb58cc24b08cfd5fe95e568fa1 -
Linux Linux 3.9 -

II. Public POCs for CVE-2026-80987

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III. Intelligence Information for CVE-2026-80987

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Patches & Fixes for CVE-2026-80987 (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-2026-80987

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