- 8.8HighCVSS base score
- 0.26%Exploitation in 30 daysEPSS · top 82% 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: take a reference on the socket found in afiucv_hs_rcv() afiucv_hs_rcv() looks up the destination socket under iucv_sk_list.lock, drops the lock, and then passes the socket to the afiucv_hs_callback_*() handlers without holding a reference. AF_IUCV sockets are not RCU-protected and are freed synchronously by iucv_sock_kill() -> sock_put(), so a concurrent close can free the socket in the window between read_unlock() and the handler, which then dereferences freed memory (for example sk->sk_data_ready() in afiucv_hs_callback_syn()). Take a reference with sock_hold() while the socket is still on the list and release it with sock_put() once the handler has run.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 2 months later
· 2 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 | High8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.26% · top 82% of all CVEs (12 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 8.8.
Affected products
- affected 3881ac441f642d56503818123446f7298442236b – < 5739be5c19495d709d902a2912c9102ce78740d5
- affected 3881ac441f642d56503818123446f7298442236b – < bc6c6e546ffff8865daaeb622ef348c2d481e80f
- affected 3881ac441f642d56503818123446f7298442236b – < e3e0679fc950191aff8f27fa78abcfc2462cff4a
- affected 3881ac441f642d56503818123446f7298442236b – < 4dc0e63abf8bc7ba8892e617c1fb8b204361e022
- affected 3881ac441f642d56503818123446f7298442236b – < 1801cb20a5025a787d6853e19c38db138344b4b4
- affected 3881ac441f642d56503818123446f7298442236b – < c75a950e77356e526672cba4584080c6c8b793b6
- affected 3881ac441f642d56503818123446f7298442236b – < 5595ea59cdf29182cf6a270cacc1426c57b603de
- affected 3881ac441f642d56503818123446f7298442236b – < 4fa349156043dc119721d067329714179f501749
- affected 3.2
- unaffected < 3.2
- unaffected 5.10.265 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.148 – ≤ 6.6.*
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/5739be5c19495d709d902a2912c9102ce78740d5 (opens in a new tab)
- https://git.kernel.org/stable/c/bc6c6e546ffff8865daaeb622ef348c2d481e80f (opens in a new tab)
- https://git.kernel.org/stable/c/e3e0679fc950191aff8f27fa78abcfc2462cff4a (opens in a new tab)
- https://git.kernel.org/stable/c/4dc0e63abf8bc7ba8892e617c1fb8b204361e022 (opens in a new tab)
- https://git.kernel.org/stable/c/1801cb20a5025a787d6853e19c38db138344b4b4 (opens in a new tab)
- https://git.kernel.org/stable/c/c75a950e77356e526672cba4584080c6c8b793b6 (opens in a new tab)
- https://git.kernel.org/stable/c/5595ea59cdf29182cf6a270cacc1426c57b603de (opens in a new tab)
- https://git.kernel.org/stable/c/4fa349156043dc119721d067329714179f501749 (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-2026-55583 (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-2026-68397)Record last updated .