CVE-2025-21639sctp: sysctl: rto_min/max: avoid using current->nsproxy
- 5.5MediumCVSS base score
- 0.23%Exploitation in 30 daysEPSS · top 86% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: rto_min/max: avoid using current->nsproxy As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The 'net' structure can be obtained from the table->data using container_of(). Note that table->data could also be used directly, as this is the only member needed from the 'net' structure, but that would increase the size of this fix, to use '*data' everywhere 'net->sctp.rto_min/max' is used.
Timeline
ID reserved
By Linux
- 21 days later
· 21 days later
Published
- 21 months later
· 21 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| 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)
- 0.23% · top 86% of all CVEs (13 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.
Affected products
- affected 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 – < c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9
- affected 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 – < 246428bfb9e7db15c5cd08e1d0eca41b65af2b06
- affected 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 – < 0f78f09466744589e420935e646ae78212a38290
- affected 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 – < 4059507e34aa5fe0fa9fd5b2b5f0c8b26ab2d482
- affected 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 – < dc9d0e3cfd16f66fbf0862857c6b391c8613ca9f
- affected 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 – < c87f1f6ade56c711f8736901e330685b453e420e
- affected 4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 – < 9fc17b76fc70763780aa78b38fcf4742384044a5
- affected 3.13
- unaffected < 3.13
- unaffected 5.4.290 – ≤ 5.4.*
- unaffected 5.10.234 – ≤ 5.10.*
- unaffected 5.15.177 – ≤ 5.15.*
- unaffected 6.1.125 – ≤ 6.1.*
- unaffected 6.6.72 – ≤ 6.6.*
- unaffected 6.12.10 – ≤ 6.12.*
- unaffected 6.13 – ≤ *
References
References10
- https://git.kernel.org/stable/c/c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9 (opens in a new tab)
- https://git.kernel.org/stable/c/246428bfb9e7db15c5cd08e1d0eca41b65af2b06 (opens in a new tab)
- https://git.kernel.org/stable/c/0f78f09466744589e420935e646ae78212a38290 (opens in a new tab)
- https://git.kernel.org/stable/c/4059507e34aa5fe0fa9fd5b2b5f0c8b26ab2d482 (opens in a new tab)
- https://git.kernel.org/stable/c/dc9d0e3cfd16f66fbf0862857c6b391c8613ca9f (opens in a new tab)
- https://git.kernel.org/stable/c/c87f1f6ade56c711f8736901e330685b453e420e (opens in a new tab)
- https://git.kernel.org/stable/c/9fc17b76fc70763780aa78b38fcf4742384044a5 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html (opens in a new tab)
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)
- EUVD EUVD-2025-2588 (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)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-21639)Record last updated .