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CVE-2026-53176— IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN

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基金会开源的操作系统Linux所使用的内核。 Linux kernel 3.10版本存在安全漏洞，该漏洞源于在drivers/infiniband/ulp/isert/ib_isert.c中isert_login_recv_done()函数计算登录请求有效载荷长度时缺少下界检查，导致整数下溢，可能允许远程iSER发起者登录阶段发送少于ISER_HEADERS_LEN字节的请求造成越界复制并导致目标节点崩溃。

CVSS 9.8 · Critical EPSS 0.76% · P54

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b8d26b3be8b33682cf163274ed07479a70554633< 75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb affected
b8d26b3be8b33682cf163274ed07479a70554633< e8a013c0c3ca2f6708341a56612a3f6d6921620a affected
b8d26b3be8b33682cf163274ed07479a70554633< bd22740d7f14cb1c0289444cfd2c8d2938667c1d affected
b8d26b3be8b33682cf163274ed07479a70554633< c1234229399f4af12c553b1b0ffd978eeba65548 affected
b8d26b3be8b33682cf163274ed07479a70554633< c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47 affected
b8d26b3be8b33682cf163274ed07479a70554633< df422fd273c96c2ee5beb80fc21adc8c70c29260 affected
b8d26b3be8b33682cf163274ed07479a70554633< 1ca40b243277c9e88be5e00bd3e083f71aefb93e affected
b8d26b3be8b33682cf163274ed07479a70554633< 29e7b925ae6df64894e82ab6419994dc25580a8a affected
… +10 more rows
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I. Basic Information for CVE-2026-53176

Vulnerability Information
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Vulnerability Title
IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN In drivers/infiniband/ulp/isert/ib_isert.c, isert_login_recv_done() computes the login request payload length as wc->byte_len minus ISER_HEADERS_LEN with no lower bound, and login_req_len is a signed int. A remote iSER initiator can post a login Send work request carrying fewer than ISER_HEADERS_LEN (76) bytes, so the subtraction underflows and login_req_len becomes negative. isert_rx_login_req() then reads that negative length back into a signed int, takes size = min(rx_buflen, MAX_KEY_VALUE_PAIRS), and because the min() is signed it keeps the negative value; the value is then passed as the memcpy() length and sign-extended to a multi-gigabyte size_t. The copy into the 8192-byte login->req_buf runs far out of bounds and faults, crashing the target node. The login phase precedes iSCSI authentication, so no credentials are required to reach this path. Reject any login PDU shorter than ISER_HEADERS_LEN before the subtraction, mirroring the existing early return on a failed work completion, so login_req_len can never go negative. The upper bound was already safe: a posted login buffer cannot deliver more than ISER_RX_PAYLOAD_SIZE, so the difference stays at or below MAX_KEY_VALUE_PAIRS and the existing min() clamps it; only the missing lower bound needs to be added.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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基金会开源的操作系统Linux所使用的内核。 Linux kernel 3.10版本存在安全漏洞，该漏洞源于在drivers/infiniband/ulp/isert/ib_isert.c中isert_login_recv_done()函数计算登录请求有效载荷长度时缺少下界检查，导致整数下溢，可能允许远程iSER发起者登录阶段发送少于ISER_HEADERS_LEN字节的请求造成越界复制并导致目标节点崩溃。
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 b8d26b3be8b33682cf163274ed07479a70554633 ~ 75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb -
Linux Linux 3.10 -

II. Public POCs for CVE-2026-53176

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III. Intelligence Information for CVE-2026-53176

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Patches & Fixes for CVE-2026-53176 (8)

Same Patch Batch · Linux · 2026-06-25 · 146 CVEs total

CVE-2026-53228 9.8 CRITICAL ipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-53247 9.8 CRITICAL net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-53151 9.8 CRITICAL rxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-53260 9.8 CRITICAL tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-53215 9.8 CRITICAL net: mvpp2: refill RX buffers before XDP or skb use
CVE-2026-53216 9.8 CRITICAL net: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-53131 9.4 CRITICAL netfilter: require Ethernet MAC header before using eth_hdr()
CVE-2026-53224 9.1 CRITICAL sctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-53225 9.1 CRITICAL sctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-53186 9.1 CRITICAL RDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-53240 8.8 HIGH xfrm: iptfs: fix use-after-free on first_skb in __input_process_payload
CVE-2026-53188 8.8 HIGH RDMA/core: Validate the passed in fops for ib_get_ucaps()
CVE-2026-53248 8.8 HIGH net: airoha: Fix use-after-free in metadata dst teardown
CVE-2026-53159 8.8 HIGH misc: fastrpc: fix DMA address corruption due to find_vma misuse
CVE-2026-53170 8.8 HIGH accel/ethosu: reject DMA commands with uninitialized length
CVE-2026-53198 8.8 HIGH ksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL
CVE-2026-53171 8.8 HIGH accel/ethosu: fix arithmetic issues in dma_length()

Showing top 20 of 146 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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