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CVE-2026-53227— net: openvswitch: fix possible kfree_skb of ERR_PTR

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 3.16之前版本存在安全漏洞，该漏洞源于openvswitch模块中"reply" skb分配在锁定ovs_mutex前后都可能发生，但错误清理仍按锁定前的顺序，当分配失败时可能导致释放无效指针。

AI Predicted 4.7 Difficulty: Moderate EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 893f139b9a6c00c097b9082a90f3041cfb3a0d20< e248fb2e680deb2bd37bac551b72638fe4938a76 affected
893f139b9a6c00c097b9082a90f3041cfb3a0d20< 0bb5b2dc1b90aa7dd1473fc8c4d813a29255ff8d affected
893f139b9a6c00c097b9082a90f3041cfb3a0d20< 971b1b37774f13acc5add0a2843f8598446b8598 affected
893f139b9a6c00c097b9082a90f3041cfb3a0d20< 25fdf53698535fe8790237f5a8a9626791429785 affected
893f139b9a6c00c097b9082a90f3041cfb3a0d20< e3d509a1b71396e1452060dbf84a805fd1c3c549 affected
893f139b9a6c00c097b9082a90f3041cfb3a0d20< ecc55aad3390129a87106841f4b68bf3d70c9264 affected
893f139b9a6c00c097b9082a90f3041cfb3a0d20< 895d1dd9057cde1687fa0f4286d47ceed0b82997 affected
893f139b9a6c00c097b9082a90f3041cfb3a0d20< ee30dd2909d8b98619f4341c70ec8dc8e155ab02 affected
… +10 more rows
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I. Basic Information for CVE-2026-53227

Vulnerability Information
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Vulnerability Title
net: openvswitch: fix possible kfree_skb of ERR_PTR
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix possible kfree_skb of ERR_PTR After the patch in the "Fixes" tag, the allocation of the "reply" skb can happen either before or after locking the ovs_mutex. However, error cleanups still follow the classical reversed order, assuming "reply" is allocated before locking: it is freed after unlocking. If "reply" allocation happens after locking the mutex and it fails, "reply" is left with an ERR_PTR, and execution jumps to the correspondent cleanup stage which will try to free an invalid pointer. Fix this by setting the pointer to NULL after having saved its error value.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel 3.16之前版本存在安全漏洞，该漏洞源于openvswitch模块中"reply" skb分配在锁定ovs_mutex前后都可能发生，但错误清理仍按锁定前的顺序，当分配失败时可能导致释放无效指针。
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 893f139b9a6c00c097b9082a90f3041cfb3a0d20 ~ e248fb2e680deb2bd37bac551b72638fe4938a76 -
Linux Linux 3.16 -

II. Public POCs for CVE-2026-53227

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III. Intelligence Information for CVE-2026-53227

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Patches & Fixes for CVE-2026-53227 (8)

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

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-2026-53151 9.8 CRITICAL rxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-53247 9.8 CRITICAL net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-53216 9.8 CRITICAL net: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-53260 9.8 CRITICAL tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
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-2026-53240 8.8 HIGH xfrm: iptfs: fix use-after-free on first_skb in __input_process_payload
CVE-2026-53171 8.8 HIGH accel/ethosu: fix arithmetic issues in dma_length()
CVE-2026-53232 8.8 HIGH net: phy: clean the sfp upstream if phy probing fails
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-2026-53188 8.8 HIGH RDMA/core: Validate the passed in fops for ib_get_ucaps()

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-2026-53227

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