CVE-2022-48809
net: fix a memleak when uncloning an skb dst and its metadata
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.28% · top 79% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected fc4099f17240767554ff3a73977acb78ef615404 – < 4ac84498fbe84a00e7aef185e2bb3e40ce71eca4
- affected fc4099f17240767554ff3a73977acb78ef615404 – < c1ff27d100e2670b03cbfddb9117e5f9fc672540
- affected fc4099f17240767554ff3a73977acb78ef615404 – < 0be943916d781df2b652793bb2d3ae4f9624c10a
- affected fc4099f17240767554ff3a73977acb78ef615404 – < a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88
- affected fc4099f17240767554ff3a73977acb78ef615404 – < 00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1
- affected fc4099f17240767554ff3a73977acb78ef615404 – < fdcb263fa5cda15b8cb24a641fa2718c47605314
- affected fc4099f17240767554ff3a73977acb78ef615404 – < 8b1087b998e273f07be13dcb5f3ca4c309c7f108
- affected fc4099f17240767554ff3a73977acb78ef615404 – < 9eeabdf17fa0ab75381045c867c370f4cc75a613
- affected 4.3
- unaffected < 4.3
- unaffected 4.9.302 – ≤ 4.9.*
- unaffected 4.14.267 – ≤ 4.14.*
- unaffected 4.19.230 – ≤ 4.19.*
- unaffected 5.4.180 – ≤ 5.4.*
- unaffected 5.10.101 – ≤ 5.10.*
- unaffected 5.15.24 – ≤ 5.15.*
- unaffected 5.16.10 – ≤ 5.16.*
- unaffected 5.17 – ≤ *
References (8)
- https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2022-48809)Record last updated .