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CVE-2026-52981— neigh: let neigh_xmit take skb ownership

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 4.1版本及之前版本存在安全漏洞，该漏洞源于邻居表中neigh_xmit函数未正确处理skb所有权，可能导致未初始化的邻居表调用时释放skb导致内存泄漏。

CVSS 7.5 · High EPSS 0.53% · P44

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62< 8a89054a1ec0767aec25ed2bbac933da6ba3cf5a affected
4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62< 9247d59ca15bf60a57dca08103f055d8a4340877 affected
4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62< 0084712e0bee204b284510cdb63182fd5a30c2b7 affected
4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62< 63063ba60d2dc334e34f1e3f9271d7f3f6f30307 affected
4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62< 445e45a2c3a078316a62d2d331a570cf34ef5079 affected
4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62< 4438113be604ee67a7bf4f81da6e1cca41332ce4 affected
4.1 affected
< 4.1 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-52981

Vulnerability Information
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Vulnerability Title
neigh: let neigh_xmit take skb ownership
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: neigh: let neigh_xmit take skb ownership neigh_xmit always releases the skb, except when no neighbour table is found. But even the first added user of neigh_xmit (mpls) relied on neigh_xmit to release the skb (or queue it for tx). sashiko reported: If neigh_xmit() is called with an uninitialized neighbor table (for example, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT and bypasses its internal out_kfree_skb error path. Because the return value of neigh_xmit() is ignored here, does this leak the SKB? Assume full ownership and remove the last code path that doesn't xmit or free skb.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 4.1版本及之前版本存在安全漏洞，该漏洞源于邻居表中neigh_xmit函数未正确处理skb所有权，可能导致未初始化的邻居表调用时释放skb导致内存泄漏。
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 4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 ~ 8a89054a1ec0767aec25ed2bbac933da6ba3cf5a -
Linux Linux 4.1 -

II. Public POCs for CVE-2026-52981

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III. Intelligence Information for CVE-2026-52981

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Patches & Fixes for CVE-2026-52981 (6)

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

CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()

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-2026-52981

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