CVE-2026-63802
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
blk-cgroup: fix UAF in __blkcg_rstat_flush()
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 20cb1c2fb7568a6054c55defe044311397e01ddb | affected | git | 96e545410c4f74c89d496c1d5d9ef8d08f14368b | Unavailable | None listed |
| 20cb1c2fb7568a6054c55defe044311397e01ddb | affected | git | bbebd9425cad3573d1527441753899b926525a0f | Unavailable | None listed |
| 20cb1c2fb7568a6054c55defe044311397e01ddb | affected | git | 5e5b7f2ef854936e95dceb6a2fdfefcb7152d2c6 | Unavailable | None listed |
| 20cb1c2fb7568a6054c55defe044311397e01ddb | affected | git | afebe44facc48a61761e885bbb7f0380d4a603ec | Unavailable | None listed |
| 20cb1c2fb7568a6054c55defe044311397e01ddb | affected | git | 0ab5ee5a1badb58cbb2242617cb01a4972b1f2a2 | Unavailable | None listed |
| 0f6090d90f627d8c58f939067d6c6821ce1b3c68 | affected | git | Unavailable | Unavailable | None listed |
| 6.3.9 | affected | semver | 6.4 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 6.4 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 6.4 | Unavailable | None listed |
| 6.6.144 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.95 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.38 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.1.3 | unaffected | semver | Unavailable | 7.1.* | None listed |
| 7.2 | unaffected | original_commit_for_fix | Unavailable | * | None listed |