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CVE-2026-53239— xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()

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存在安全漏洞，该漏洞源于xfrm策略处理中的释放后重用问题，可能导致攻击者利用竞争条件在未持有锁的情况下访问已释放的内存。

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 6be3b0db6db82cf056a72cc18042048edd27f8ee< 8fc536e9f6856230f19c7d13e71af064b6a77b22 affected
6be3b0db6db82cf056a72cc18042048edd27f8ee< c4c1ea36d83bf3c4569468ca5b8b614fda1bf821 affected
6be3b0db6db82cf056a72cc18042048edd27f8ee< 25c8c7fb3b0b9668c7d05e209f58c158d2b020c7 affected
6be3b0db6db82cf056a72cc18042048edd27f8ee< 42827d03f8009a6a218bacab153e21f39d6a121c affected
6be3b0db6db82cf056a72cc18042048edd27f8ee< 88697cf980222d5906a37bf47662dac0732e2a0f affected
6be3b0db6db82cf056a72cc18042048edd27f8ee< b5316e2b8614a87d8736941972441cb47bfd4491 affected
6be3b0db6db82cf056a72cc18042048edd27f8ee< ec82ea4eb220164d854f8734ca5a35e23e577b94 affected
6be3b0db6db82cf056a72cc18042048edd27f8ee< 7f2d76c9c03257c0782afef9d95321fa04096f60 affected
… +10 more rows
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I. Basic Information for CVE-2026-53239

Vulnerability Information
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Vulnerability Title
xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() Fix the race by pruning the bin while still holding xfrm_policy_lock, before dropping it. Use __xfrm_policy_inexact_prune_bin() directly since the lock is already held. The wrapper xfrm_policy_inexact_prune_bin() becomes unused and is removed. Race: CPU0 (XFRM_MSG_DELPOLICY) CPU1 (XFRM_MSG_NEWSPDINFO) ========================== ========================== xfrm_policy_bysel_ctx(): spin_lock_bh(xfrm_policy_lock) bin = xfrm_policy_inexact_lookup() __xfrm_policy_unlink(pol) spin_unlock_bh(xfrm_policy_lock) xfrm_policy_kill(ret) // wide window, lock not held xfrm_hash_rebuild(): spin_lock_bh(xfrm_policy_lock) __xfrm_policy_inexact_flush(): kfree_rcu(bin) // bin freed spin_unlock_bh(xfrm_policy_lock) xfrm_policy_inexact_prune_bin(bin) // UAF: bin is freed
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存在安全漏洞，该漏洞源于xfrm策略处理中的释放后重用问题，可能导致攻击者利用竞争条件在未持有锁的情况下访问已释放的内存。
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 6be3b0db6db82cf056a72cc18042048edd27f8ee ~ 8fc536e9f6856230f19c7d13e71af064b6a77b22 -
Linux Linux 5.0 -

II. Public POCs for CVE-2026-53239

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III. Intelligence Information for CVE-2026-53239

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Patches & Fixes for CVE-2026-53239 (8)

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

CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-53176 9.8 CRITICAL IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-53228 9.8 CRITICAL ipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
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-2026-53260 9.8 CRITICAL tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-53216 9.8 CRITICAL net: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-53215 9.8 CRITICAL net: mvpp2: refill RX buffers before XDP or skb use
CVE-2026-53131 9.4 CRITICAL netfilter: require Ethernet MAC header before using eth_hdr()
CVE-2026-53225 9.1 CRITICAL sctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-53224 9.1 CRITICAL sctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-53186 9.1 CRITICAL RDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-53248 8.8 HIGH net: airoha: Fix use-after-free in metadata dst teardown
CVE-2026-53198 8.8 HIGH ksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL
CVE-2026-53159 8.8 HIGH misc: fastrpc: fix DMA address corruption due to find_vma misuse
CVE-2026-53275 8.8 HIGH ipv6: mcast: Fix use-after-free when processing MLD queries
CVE-2026-53188 8.8 HIGH RDMA/core: Validate the passed in fops for ib_get_ucaps()
CVE-2026-53170 8.8 HIGH accel/ethosu: reject DMA commands with uninitialized length

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53239

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