- 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: blk-cgroup: fix UAF in __blkcg_rstat_flush() When multiple blkgs in the same blkcg are released concurrently, a use-after-free can occur. The race happens when one blkg's __blkcg_rstat_flush() removes another blkg's iostat entries via llist_del_all(). The second blkg sees an empty list and proceeds to free itself while the first is still iterating over its entries. Move the flush from __blkg_release() (RCU callback) to blkg_release() (before call_rcu). This ensures the RCU grace period waits for any concurrent flush's rcu_read_lock() section to complete before freeing.
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 (11 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 20cb1c2fb7568a6054c55defe044311397e01ddb – < 96e545410c4f74c89d496c1d5d9ef8d08f14368b
- affected 20cb1c2fb7568a6054c55defe044311397e01ddb – < bbebd9425cad3573d1527441753899b926525a0f
- affected 20cb1c2fb7568a6054c55defe044311397e01ddb – < 5e5b7f2ef854936e95dceb6a2fdfefcb7152d2c6
- affected 20cb1c2fb7568a6054c55defe044311397e01ddb – < afebe44facc48a61761e885bbb7f0380d4a603ec
- affected 20cb1c2fb7568a6054c55defe044311397e01ddb – < 0ab5ee5a1badb58cbb2242617cb01a4972b1f2a2
- affected 0f6090d90f627d8c58f939067d6c6821ce1b3c68
- affected 6.3.9 – < 6.4
- affected 6.4
- unaffected < 6.4
- unaffected 6.6.144 – ≤ 6.6.*
- unaffected 6.12.95 – ≤ 6.12.*
- unaffected 6.18.38 – ≤ 6.18.*
- unaffected 7.1.3 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References5
- https://git.kernel.org/stable/c/96e545410c4f74c89d496c1d5d9ef8d08f14368b (opens in a new tab)
- https://git.kernel.org/stable/c/bbebd9425cad3573d1527441753899b926525a0f (opens in a new tab)
- https://git.kernel.org/stable/c/5e5b7f2ef854936e95dceb6a2fdfefcb7152d2c6 (opens in a new tab)
- https://git.kernel.org/stable/c/afebe44facc48a61761e885bbb7f0380d4a603ec (opens in a new tab)
- https://git.kernel.org/stable/c/0ab5ee5a1badb58cbb2242617cb01a4972b1f2a2 (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-2026-45468 (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-2026-63802)Record last updated .