net: fix a memleak when uncloning an skb dst and its metadata (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.28 % · percentile 21 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Modified
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.
Weaknesses (CWE)
- CWE-401 — Missing Release of Memory after Effective Lifetime
References
- https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4
- https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540
- https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a
- https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88
- https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1
- https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314
- https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108
- https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2022-53688
- GCVE · GCVE-0-2022-48809
CERT-FR advisories
- CERTFR-2025-AVI-1057 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0024 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2024-AVI-1048 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0717 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0693 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.3 < 4.9.302cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.10 < 4.14.267cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.15 < 4.19.230cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.20 < 5.4.180cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.5 < 5.10.101cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.11 < 5.15.24cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.16 < 5.16.10
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected fc4099f17240767554ff3a73977acb78ef615404 < 4ac84498fbe84a00e7aef185e2bb3e40ce71eca4 ; affected fc4099f17240767554ff3a73977acb78ef615404 < c1ff27d100e2670b03cbfddb9117e5f9fc672540 ; affected fc4099f17240767554ff3a73977acb78ef615404 < 0be943916d781df2b652793bb2d3ae4f9624c10a ; affected fc4099f17240767554ff3a73977acb78ef615404 < a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88 ; affected fc4099f17240767554ff3a73977acb78ef615404 < 00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1 ; affected fc4099f17240767554ff3a73977acb78ef615404 < fdcb263fa5cda15b8cb24a641fa2718c47605314 |
| Linux · Linux | affected 4.3 ; unaffected 0 < 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.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |