CVE-2026-64004net/iucv: fix locking in .getsockopt
- 7.8HighCVSS base score
- 0.10%Exploitation in 30 daysEPSS · top 99% 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: net/iucv: fix locking in .getsockopt Mirror iucv_sock_setsockopt() and wrap the whole switch in lock_sock()/release_sock(). The pre-existing SO_MSGLIMIT-only lock becomes redundant and is removed. Any AF_IUCV HIPER user can potentially crash the kernel by racing recvmsg() with getsockopt(SO_MSGSIZE): the SO_MSGSIZE arm dereferences iucv->hs_dev->mtu after iucv_sock_close() (called from the racing recvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference oops.
Timeline
ID reserved
By Linux
Published
- 3 months later
· 3 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 |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.10% · top 99% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 51363b8751a673a00ad48eea895266396d53fa52 – < 884eb247b74d86db97e3a37f0d6fc8e1e83590dd
- affected 51363b8751a673a00ad48eea895266396d53fa52 – < 45bb8de8c95d8899f4b8f61bd9bceb8132af73cb
- affected 51363b8751a673a00ad48eea895266396d53fa52 – < 1fc30bd4e55e2dd622d2d366cecd732c1841bbee
- affected 51363b8751a673a00ad48eea895266396d53fa52 – < cd691beafea0dd779e69e81ccc26b0ab50efcb5e
- affected 51363b8751a673a00ad48eea895266396d53fa52 – < 6e792b8dd3002bbc4136745928a9605df1a72b8a
- affected 51363b8751a673a00ad48eea895266396d53fa52 – < 9817369243380e287ebe5525411557eaa3aa2a79
- affected 51363b8751a673a00ad48eea895266396d53fa52 – < 69554adc7a6fa04ede3ad7512321d83748e3c920
- affected 51363b8751a673a00ad48eea895266396d53fa52 – < 3589d20a666caf30ad100c960a2de7de390fce88
- affected 3.4
- unaffected < 3.4
- unaffected 5.10.259 – ≤ 5.10.*
- unaffected 5.15.210 – ≤ 5.15.*
- unaffected 6.1.176 – ≤ 6.1.*
- unaffected 6.6.143 – ≤ 6.6.*
- unaffected 6.12.93 – ≤ 6.12.*
- unaffected 6.18.35 – ≤ 6.18.*
- unaffected 7.0.12 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References8
- https://git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590dd (opens in a new tab)
- https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb (opens in a new tab)
- https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee (opens in a new tab)
- https://git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e (opens in a new tab)
- https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a (opens in a new tab)
- https://git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79 (opens in a new tab)
- https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920 (opens in a new tab)
- https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88 (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-2026-45577 (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-2026-64004)Record last updated .