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CVE-2026-93228— svcrdma: Reject Write/Reply chunks with segcount 0

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，已解决以下漏洞： svcrdma：拒绝 segcount 为 0 的 Write/Reply 数据块 对等方可以发送一个 字段为零的 Write 或 Reply 数据块。 仅拒绝 的情况，因此零值会通过范围检查，而 会返回当前（非 NULL）光标，且不进行推进。该函数返回 true，随后 将一个 的 链接到 或 。 本系列中的一个较早补丁已使 对 安全，因此它不再驱动以往用于内存遍历的逻辑。在解码边界处拒绝格式错误的帧仍具有价值，作为纵深防御措施：它将退化的零段数据块完全排除在已解析的数据块

CVSS 9.1 · Critical EPSS 0.47% · P38

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 78147ca8b4a9b6cf0e597ddd6bf17959e08376c2< fe533ae1bed2ef2b3d54ee7ab410da1874ed3d4f affected
78147ca8b4a9b6cf0e597ddd6bf17959e08376c2< a798714b58041e88716db3bf8fb03ae13eecd54a affected
78147ca8b4a9b6cf0e597ddd6bf17959e08376c2< 45dbdb2637b7fc5f1355b588780d2a7fb0516805 affected
78147ca8b4a9b6cf0e597ddd6bf17959e08376c2< 9808eb7656666acc7291bae9ab6b987bd16e47e0 affected
5.11 affected
< 5.11 unaffected
6.12.111≤ 6.12.* unaffected
6.18.50≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-93228

Vulnerability Information
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Vulnerability Title
svcrdma: Reject Write/Reply chunks with segcount 0
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: svcrdma: Reject Write/Reply chunks with segcount 0 A peer can send a Write or Reply chunk whose segcount field is zero. xdr_check_write_chunk() only rejects segcount > rc_maxpages, so zero passes the range check, and xdr_inline_decode(stream, 0) returns the current (non-NULL) cursor without advancing. The function returns true and pcl_alloc_write() then links a struct svc_rdma_chunk with ch_segcount == 0 onto rc_write_pcl or rc_reply_pcl. An earlier patch in this series made pcl_for_each_segment() safe for ch_segcount == 0, so this no longer drives the memory walk it used to. Rejecting the malformed frame at the decode boundary is still worthwhile as defense in depth: it keeps degenerate zero-segment chunks off the parsed chunk lists entirely, so any future consumer that walks ch_segments directly cannot observe one, and it makes the zero-floor easy to backport to trees where the macro change is more intrusive. RFC 8166 has no meaning for a Write/Reply chunk that describes no remote buffer, so no legitimate client is affected. xdr_check_reply_chunk() funnels Reply chunks through xdr_check_write_chunk() and inherits the same rejection. pcl_alloc_write() also links each chunk onto the parsed chunk list before filling its segment array. If a future change weakens the segcount-0 rejection, an incomplete chunk is visible to consumers during the fill loop. Reorder so that list_add_tail() follows the segment fill loop, ensuring only fully-populated chunks appear on the list.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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 78147ca8b4a9b6cf0e597ddd6bf17959e08376c2 ~ fe533ae1bed2ef2b3d54ee7ab410da1874ed3d4f -
Linux Linux 5.11 -

II. Public POCs for CVE-2026-93228

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III. Intelligence Information for CVE-2026-93228

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Patches & Fixes for CVE-2026-93228 (4)

Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total

CVE-2026-93207 9.8 CRITICAL SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry
CVE-2026-97413 9.8 CRITICAL RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
CVE-2026-93793 8.8 HIGH wifi: iwlwifi: mvm: validate TX_CMD response layout
CVE-2026-93799 8.8 HIGH wifi: iwlwifi: mvm: validate sta_id in BA window status notif
CVE-2026-93790 8.8 HIGH wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif
CVE-2026-93806 8.8 HIGH wifi: cfg80211: validate assoc response length before status and IE access
CVE-2026-97442 8.8 HIGH wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi
CVE-2026-97409 8.8 HIGH nvme-fc: Do not cancel requests in io target before it is initialized
CVE-2026-97509 8.8 HIGH thunderbolt: Keep XDomain reference during the lifetime of a service
CVE-2026-93280 8.8 HIGH greybus: audio: bound the topology section sizes against the fetched size
CVE-2026-93284 8.8 HIGH drm/pagemap: dma-unmap pages before handling migration errors
CVE-2026-97451 8.4 HIGH ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
CVE-2026-97455 8.4 HIGH ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
CVE-2026-97452 8.4 HIGH ACPICA: Prevent adding invalid references
CVE-2026-97450 8.4 HIGH ACPICA: validate handler object type in two places
CVE-2026-93827 8.4 HIGH virtio-fs: avoid double-free on failed queue setup
CVE-2026-97433 8.2 HIGH nvme: validate FDP configuration descriptor sizes
CVE-2026-93786 8.1 HIGH ksmbd: preserve VFS inherited POSIX ACL mask
CVE-2026-93221 8.1 HIGH nfsd: convert nfsd_net boolean flags to unsigned long flags word
CVE-2026-93224 8.1 HIGH svcrdma: Fix unmatched rn_unregister on failed accept

Showing top 20 of 234 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-93228

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