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 | ID | Title |
|---|---|---|
Debian DLA |
DLA-4664-1 | linux security update |
Debian DLA |
DLA-4665-1 | linux security update |
Debian DLA |
DLA-4671-1 | linux-6.1 security update |
Ubuntu USN |
USN-8566-1 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-8567-1 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-8568-1 | Linux kernel (OEM) vulnerabilities |
Ubuntu USN |
USN-8569-1 | Linux kernel (HWE) vulnerabilities |
Ubuntu USN |
USN-8574-1 | Linux kernel (GCP FIPS) vulnerabilities |
Ubuntu USN |
USN-8575-1 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-8576-1 | Linux kernel (NVIDIA Tegra) vulnerabilities |
Ubuntu USN |
USN-8593-1 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-8574-2 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-8595-1 | Linux kernel (Oracle) vulnerabilities |
Ubuntu USN |
USN-8596-1 | Linux kernel (NVIDIA) vulnerabilities |
Ubuntu USN |
USN-8575-2 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-8576-2 | Linux kernel (NVIDIA Tegra) vulnerabilities |
Ubuntu USN |
USN-8575-3 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-8595-2 | Linux kernel (AWS) vulnerabilities |
Ubuntu USN |
USN-8603-1 | Linux kernel (Azure) vulnerabilities |
Ubuntu USN |
USN-8606-1 | Linux kernel (Azure) vulnerabilities |
Ubuntu USN |
USN-8607-1 | Linux kernel (Azure CVM) vulnerabilities |
Ubuntu USN |
USN-8608-1 | Linux kernel (Azure FIPS) vulnerabilities |
Ubuntu USN |
USN-8609-1 | Linux kernel (Azure CVM) vulnerabilities |
Ubuntu USN |
USN-8610-1 | Linux kernel (Azure CVM) vulnerabilities |
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Sun, 28 Jun 2026 08:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
cvssV3_1
|
cvssV3_1
|
Fri, 26 Jun 2026 02:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-415 |
Fri, 26 Jun 2026 00:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-763 | |
| References |
| |
| Metrics |
threat_severity
|
cvssV3_1
|
Wed, 24 Jun 2026 19:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-415 |
Wed, 24 Jun 2026 17:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | tipc: fix double-free in tipc_buf_append() | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
|
Projects
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Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-07-27T12:05:46.679Z
Reserved: 2026-06-09T07:44:35.377Z
Link: CVE-2026-52993
No data.
No data.
OpenCVE Enrichment
Updated: 2026-06-28T13:15:16Z
Debian DLA
Ubuntu USN