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CVE-2026-89487— openvswitch: only skb_tx_error() a packet we are about to drop

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，以下漏洞已修复： openvswitch：仅对即将丢弃的数据包调用 skb_tx_error() 借用数据包 skb——它仅将 skb 拷贝到一个私有的 netlink 消息（ ）中，并不拥有该 skb；返回后， 会继续通过流处理剩余的 actions。然而，其错误路径仍然调用了 ，该函数通过 执行 ，从而从该仍然存活的 skb 中清除了 （ 的内核文档说明“skb 在此之后必须被释放”）。 对于携带 page-cache 分片的 skb， 是 在执行原地 AEAD 解密前调用 的依据。一旦

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 36d5fe6a000790f56039afe26834265db0a3ad4c< 6767d70cf46f65807a6a4c4406a518e6c12e36ae affected
36d5fe6a000790f56039afe26834265db0a3ad4c< e41a59fc056f63a7a1f42788913c53cc48d744aa affected
36d5fe6a000790f56039afe26834265db0a3ad4c< 5d85eef222cfd28e73deed7402c100229e8b9e6e affected
36d5fe6a000790f56039afe26834265db0a3ad4c< 0dbc2398fca3bb33eda963849f865ddb1b3aa05e affected
c5f0c0e7525443add533495e93ba8de6feab2396 affected
1674b4bf3eea3cac51b70778e89f8025f7cfe695 affected
3.10.51< 3.11 affected
3.12.40< 3.13 affected
… +6 more rows
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I. Basic Information for CVE-2026-89487

Vulnerability Information
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Vulnerability Title
openvswitch: only skb_tx_error() a packet we are about to drop
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: openvswitch: only skb_tx_error() a packet we are about to drop queue_userspace_packet() borrows the packet skb -- it only copies it into a private netlink message (user_skb) and does not own it; on return do_execute_actions() keeps forwarding it through the flow's remaining actions. Its error path nevertheless calls skb_tx_error(skb), which via skb_zcopy_clear() does skb_shinfo(skb)->flags &= ~SKBFL_ALL_ZEROCOPY, stripping SKBFL_SHARED_FRAG from that live skb (skb_tx_error()'s kerneldoc says "skb must be freed afterwards"). For a MSG_ZEROCOPY skb carrying page-cache frags, SKBFL_SHARED_FRAG is what makes esp_input() skb_cow_data() before in-place AEAD; once it is stripped a later local ESP-in-UDP delivery decrypts in place over pages the sender does not own -- an unprivileged page-cache write (the "Fragnesia" primitive). do_execute_actions() ignores output_userspace()'s return value, so any action after a failed USERSPACE upcall inherits the stripped skb. Move the skb_tx_error() to the flow-miss drop path - the "default" branch of ovs_dp_process_packet()'s switch(error), before kfree_skb(). The call has been here since commit 36d5fe6a0007 ("core, nfqueue, openvswitch: Orphan frags in skb_zerocopy and handle errors") but was harmless until esp_input() began relying on SKBFL_SHARED_FRAG to gate in-place decrypt; only then did stripping it on a still-forwarded skb become a page-cache write primitive.
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 36d5fe6a000790f56039afe26834265db0a3ad4c ~ 6767d70cf46f65807a6a4c4406a518e6c12e36ae -
Linux Linux 3.14 -

II. Public POCs for CVE-2026-89487

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III. Intelligence Information for CVE-2026-89487

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Other References for CVE-2026-89487 (4)

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

CVE-2026-89490 ocfs2: fix readdir position truncation on 32-bit kernels
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-2026-89488 openvswitch: Fix CT limit teardown use-after-free
CVE-2026-89489 openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf
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-2026-89500 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-2026-89502 ring-buffer: Free cpu_buffer::free_page with subbuf_order

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-2026-89487

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