CVE-2022-48809
net: fix a memleak when uncloning an skb dst and its metadata
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
net: fix a memleak when uncloning an skb dst and its metadata
When uncloning an skb dst and its associated metadata, a new
dst+metadata is allocated and later replaces the old one in the skb.
This is helpful to have a non-shared dst+metadata attached to a specific
skb.
The issue is the uncloned dst+metadata is initialized with a refcount of
1, which is increased to 2 before attaching it to the skb. When
tun_dst_unclone returns, the dst+metadata is only referenced from a
single place (the skb) while its refcount is 2. Its refcount will never
drop to 0 (when the skb is consumed), leading to a memory leak.
Fix this by removing the call to dst_hold in tun_dst_unclone, as the
dst+metadata refcount is already 1.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-07-16 CVE Reserved
- 2024-07-16 CVE Published
- 2024-08-08 EPSS Updated
- 2024-11-04 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (9)
URL | Tag | Source |
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https://git.kernel.org/stable/c/fc4099f17240767554ff3a73977acb78ef615404 | Vuln. Introduced |
URL | Date | SRC |
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URL | Date | SRC |
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Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
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Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 4.9.302 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 4.9.302" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 4.14.267 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 4.14.267" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 4.19.230 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 4.19.230" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 5.4.180 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 5.4.180" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 5.10.101 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 5.10.101" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 5.15.24 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 5.15.24" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 5.16.10 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 5.16.10" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.3 < 5.17 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.3 < 5.17" | en |
Affected
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