- 9.8CriticalCVSS base score
- 0.73%Exploitation in 30 daysEPSS · top 45% 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: locking/rt: Fix the incorrect RCU protection in rt_spin_unlock() rt_spin_unlock() releases the RCU protection before unlocking the lock. That opens the door for the following UAF scenario: T1 T2 spin_lock(&p->lock); rcu_read_lock(); invalidate(p); p = rcu_dereference(ptr); rcu_assign_pointer(ptr, NULL); if (!p) return; spin_unlock(&p->lock); spin_lock(&p->lock) lock(&lock->lock); rcu_read_lock(); kfree_rcu(p); rcu_read_unlock(); .... spin_unlock(&p->lock) rcu_read_unlock(); // Ends grace period rcu_do_batch() kfree(p); UAF -> rt_mutex_cmpxchg_release(&lock->lock...) Regular spinlocks keep preemption disabled accross the unlock operation, which provides full RCU protection, but the RT substitution fails to resemble that. Same applies for the rwlock substitution. Move the rcu_read_unlock() invocation past the unlock operations to match the non-RT semantics. This makes it asymmetric vs. rt_xxx_lock(), but that's harmless as the caller needs to hold RCU read lock across the lock operation. The migrate_enable() call stays before the unlock operation because there is no per CPU operation in the unlock path which would require migration to be kept disabled.
Timeline
ID reserved
By Linux
- 6 days later
· 6 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 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.73% · top 45% of all CVEs (11 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 0f383b6dc96e976dfbf2721b0bf10bd96103b341 – < af28d801cd2db4cc7378554499bd4a5d84a5517e
- affected 0f383b6dc96e976dfbf2721b0bf10bd96103b341 – < 9d1fcd64ab81200e02b7a6db5eb1da8e244e8289
- affected 0f383b6dc96e976dfbf2721b0bf10bd96103b341 – < 3cfaac77b3c32ac3940df28866de263c3f45d24c
- affected 0f383b6dc96e976dfbf2721b0bf10bd96103b341 – < 1f0d56d3f1e88f20f6e46109402f8c15d59bac37
- affected 0f383b6dc96e976dfbf2721b0bf10bd96103b341 – < 633cadbc0b8323f5cc140a285d2432089dbb534e
- affected 0f383b6dc96e976dfbf2721b0bf10bd96103b341 – < 83f9fb561c1c3917e19f95523dd933c7d30291aa
- affected 0f383b6dc96e976dfbf2721b0bf10bd96103b341 – < 89038cc87d80c77e7aa6f42a64b2573b74af339f
- affected 5.15
- unaffected < 5.15
- unaffected 5.15.217 – ≤ 5.15.*
- unaffected 6.1.184 – ≤ 6.1.*
- unaffected 6.6.148 – ≤ 6.6.*
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References7
- https://git.kernel.org/stable/c/af28d801cd2db4cc7378554499bd4a5d84a5517e (opens in a new tab)
- https://git.kernel.org/stable/c/9d1fcd64ab81200e02b7a6db5eb1da8e244e8289 (opens in a new tab)
- https://git.kernel.org/stable/c/3cfaac77b3c32ac3940df28866de263c3f45d24c (opens in a new tab)
- https://git.kernel.org/stable/c/1f0d56d3f1e88f20f6e46109402f8c15d59bac37 (opens in a new tab)
- https://git.kernel.org/stable/c/633cadbc0b8323f5cc140a285d2432089dbb534e (opens in a new tab)
- https://git.kernel.org/stable/c/83f9fb561c1c3917e19f95523dd933c7d30291aa (opens in a new tab)
- https://git.kernel.org/stable/c/89038cc87d80c77e7aa6f42a64b2573b74af339f (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-2026-59027 (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-2026-72069)Record last updated .