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CVE-2026-52993— tipc: fix double-free in tipc_buf_append()

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 4.15版本存在安全漏洞，该漏洞源于tipc_buf_append函数中的双重释放问题，可能导致内存破坏。

CVSS 9.8 · Critical EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux d618d09a68e4eed7a435beb2e355250f6f40664a< a438975a6dcdbd70865978c021650d1485586f0b affected
d618d09a68e4eed7a435beb2e355250f6f40664a< 4ee4deadaae7cb2e3d53af0fc889cf92a73413c0 affected
d618d09a68e4eed7a435beb2e355250f6f40664a< d3556656c6daebf8def751c7e71d11dd0a180d24 affected
d618d09a68e4eed7a435beb2e355250f6f40664a< 0274f24485fc38032d4093e463dc3ff5c7a667c9 affected
d618d09a68e4eed7a435beb2e355250f6f40664a< 4d104882bc815d4ec666ace9155f5f52715879a6 affected
d618d09a68e4eed7a435beb2e355250f6f40664a< 1d5e589055880fae229e229e1929e087dbe08cf3 affected
d618d09a68e4eed7a435beb2e355250f6f40664a< 29940fff14110ca48c5ccc168d121665b51bb778 affected
d618d09a68e4eed7a435beb2e355250f6f40664a< d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a affected
… +10 more rows
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I. Basic Information for CVE-2026-52993

Vulnerability Information
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Vulnerability Title
tipc: fix double-free in tipc_buf_append()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tipc: fix double-free in tipc_buf_append() tipc_msg_validate() can potentially reallocate the skb it is validating, freeing the old one. In tipc_buf_append(), it was being called with a pointer to a local variable which was a copy of the caller's skb pointer. If the skb was reallocated and validation subsequently failed, the error handling path would free the original skb pointer, which had already been freed, leading to double-free. Fix this by checking if head now points to a newly allocated reassembled skb. If it does, reassign *headbuf for later freeing operations.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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 4.15版本存在安全漏洞，该漏洞源于tipc_buf_append函数中的双重释放问题，可能导致内存破坏。
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 d618d09a68e4eed7a435beb2e355250f6f40664a ~ a438975a6dcdbd70865978c021650d1485586f0b -
Linux Linux 4.15 -

II. Public POCs for CVE-2026-52993

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III. Intelligence Information for CVE-2026-52993

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Patches & Fixes for CVE-2026-52993 (6)

Other References for CVE-2026-52993 (1)

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

CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
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-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
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-2026-52914 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-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()
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-2026-53053 8.8 HIGH iommu/amd: Fix clone_alias() to use the original device's devid

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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