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CVE-2026-52935— xfrm: espintcp: do not reuse an in-progress partial send

CVSS 7.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinuxe27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 6564e9c7af7e1dc7bfe7f3093b728abe484d7630affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 1777ceac4bea5e568a5ad44b7f9bb219c1db21b6affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 8c6c691bf062dc0753a139a4ab8cb92a70fcf8f3affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< aa82a078f70f7ff88ba7d1017134e79d1ac140f2affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< ba21439302db9a82fe4edbed1e38a97271529421affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< f9b38a8fbfa07f1deaf7ee1eb38fa8b21ea13990affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 37487d55bf3300e3d2c1368da5c2bd3e3834ea4faffected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< c381039ade2e161ab08c0eda73c4f8b9a7115928affected
… +10 more rows
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I. Basic Information for CVE-2026-52935

Vulnerability Information
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Vulnerability Title
xfrm: espintcp: do not reuse an in-progress partial send
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: espintcp: do not reuse an in-progress partial send espintcp keeps a single in-flight transmit in ctx->partial. Before building a new sk_msg, espintcp_sendmsg() first tries to flush that state through espintcp_push_msgs(). For blocking callers, espintcp_push_msgs() may return success even when the previous partial send is still pending. espintcp_sendmsg() would then reinitialize emsg->skmsg and reuse ctx->partial while the old transfer still owns that state. Do not rebuild the send message when ctx->partial is still in progress. If espintcp_push_msgs() returns with emsg->len still set, fail the new send instead of overwriting the live partial state. This is a memory-safety fix: reusing the live partial-send state can leave a stale offset attached to a new sk_msg and lead to an out-of- bounds read in the send path. tcp_sendmsg_locked() already handles waiting for send buffer memory, so the fix here is just to preserve espintcp's one-message-at-a-time transmit state.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel 5.6版本存在安全漏洞，该漏洞源于espintcp在ctx->partial传输进行时重用该状态，可能导致新sk_msg关联过时偏移并导致越界读取。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 ~ 6564e9c7af7e1dc7bfe7f3093b728abe484d7630 -
LinuxLinux 5.6 -

II. Public POCs for CVE-2026-52935

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III. Intelligence Information for CVE-2026-52935

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Patches & Fixes for CVE-2026-52935 (7)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-530889.8 CRITICALnet: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-530469.8 CRITICALksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-530499.8 CRITICALgfs2: add some missing log locking
CVE-2026-529559.8 CRITICALlibceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-530459.8 CRITICALmemory: tegra124-emc: Fix dll_change check
CVE-2026-529829.8 CRITICALnet: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-529869.8 CRITICALnetfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-529899.8 CRITICALnvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-529939.8 CRITICALtipc: fix double-free in tipc_buf_append()
CVE-2026-529319.8 CRITICALbatman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-530029.8 CRITICALnetfilter: conntrack: remove sprintf usage
CVE-2026-529249.8 CRITICALsctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-530559.8 CRITICALcrypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-530069.8 CRITICALipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-529149.8 CRITICALbatman-adv: fix fragment reassembly length accounting
CVE-2026-530869.8 CRITICALnet: bcmgenet: fix racing timeout handler
CVE-2026-530109.8 CRITICALksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-529999.1 CRITICALnetfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-529589.1 CRITICALlibceph: Fix potential out-of-bounds access in osdmap_decode()
CVE-2026-530439.1 CRITICALocfs2/dlm: validate qr_numregions in dlm_match_regions()

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52935

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