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CVE-2026-80848— xfrm: espintcp: fix UAF during close

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espintcp_close函数在关闭espintcp套接字时未持有任何套接字锁就释放emsg->skb，与xfrm_trans_reinject工作队列并发读取同一skb，产生竞争条件，可能导致释放后重用。

AI Predicted 7.8 Difficulty: Hard EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1047 · Windows Management Instrumentation

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 29121c5e6591da527e8e36ddac7120dc527f574d affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< ed5d9102190c45fc70121c036b0626b740040b75 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 4bc0dfa28dca6fc0084203732695968049c44072 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< ff8dd7a932f34409a56e1b91a1219340f17457e9 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 4b31a875693c480c611519faca46216514e3e052 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 24efebecf415ba264adba0f0491cec436463a14f affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< eb3bbf29c723fe75c0eb92be14f0ec92971fe272 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 54b41ad14da9a981131ab6e4d3f79321a503ea5d affected
… +12 more rows
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I. Basic Information for CVE-2026-80848

Vulnerability Information
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Vulnerability Title
xfrm: espintcp: fix UAF during close
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: espintcp: fix UAF during close ZDI reported and analyzed a race condition during close for espintcp sockets: espintcp_close() frees emsg->skb via kfree_skb() without holding any socket lock. Concurrently, the xfrm_trans_reinject work queue invokes esp_output_tcp_finish() -> espintcp_push_skb() -> espintcp_push_msgs() -> skb_send_sock_locked(), which reads the same skb as a data source. Fix this by adding a synchronize_rcu() call after resetting sk_prot, since esp_output_tcp_finish() runs under RCU and won't use a socket with sk_prot == &tcp_prot. Simply taking the socket lock in espintcp_close() could lead to leaks, if esp_output_tcp_finish() re-adds an skb in the slot we just freed. After this, the existing barrier() is no longer needed.
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
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espintcp_close函数在关闭espintcp套接字时未持有任何套接字锁就释放emsg->skb，与xfrm_trans_reinject工作队列并发读取同一skb，产生竞争条件，可能导致释放后重用。
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 e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 ~ 29121c5e6591da527e8e36ddac7120dc527f574d -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-80848

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III. Intelligence Information for CVE-2026-80848

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Patches & Fixes for CVE-2026-80848 (9)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80874 arm64: dts: renesas: ironhide: Describe inline ECC carveouts
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80848

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