CVE Explorer

CVE-2026-63802

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_r

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d996f2f36f144d94bbcfe37f4548e400348b15c2a2770e449b8c449898633889

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"affected","product":"Linux","programFiles":["block/blk-cgroup.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.4"},{"lessThan":"6.4","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.144","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.95","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.38","versionType":"semver"},{"lessThanOrEqua…

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:a7c59e3e56f73b6914f843ac70c9e1e59921e1aa9d4cb6c67bf7e34b36ac34e6 · sha256:034ec53837213383… · /containers/cna/affected/1

{"defaultStatus":"unaffected","product":"Linux","programFiles":["block/blk-cgroup.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"96e545410c4f74c89d496c1d5d9ef8d08f14368b","status":"affected","version":"20cb1c2fb7568a6054c55defe044311397e01ddb","versionType":"git"},{"lessThan":"bbebd9425cad3573d1527441753899b926525a0f","status":"affected","version":"20cb1c2fb7568a6054c55defe044311397e01ddb","versionType":"git"},{"lessThan":"5e5b7f2ef854936e95dceb6a2fdfefcb7152d2c6","status":"affected","version":"20cb1c2fb7568a6054c55defe04…

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:a7c59e3e56f73b6914f843ac70c9e1e59921e1aa9d4cb6c67bf7e34b36ac34e6 · sha256:034ec53837213383… · /containers/cna/affected/0

Affected products and versions

2 source assertions

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:a7c59e3e56f73b6914f843ac70c9e1e59921e1aa9d4cb6c67bf7e34b36ac34e6 · sha256:034ec53837213383… · /containers/cna/affected/1

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:a7c59e3e56f73b6914f843ac70c9e1e59921e1aa9d4cb6c67bf7e34b36ac34e6 · sha256:034ec53837213383… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:a7c59e3e56f73b6914f843ac70c9e1e59921e1aa9d4cb6c67bf7e34b36ac34e6 · sha256:034ec53837213383… · /containers/cna/metrics/0/cvssV3_1

Source references

5 source assertions

{"url":"https://git.kernel.org/stable/c/0ab5ee5a1badb58cbb2242617cb01a4972b1f2a2"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a7c59e3e56f73b6914f843ac70c9e1e59921e1aa9d4cb6c67bf7e34b36ac34e6 · sha256:034ec53837213383… · /containers/cna/references/4

{"url":"https://git.kernel.org/stable/c/5e5b7f2ef854936e95dceb6a2fdfefcb7152d2c6"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a7c59e3e56f73b6914f843ac70c9e1e59921e1aa9d4cb6c67bf7e34b36ac34e6 · sha256:034ec53837213383… · /containers/cna/references/2

{"url":"https://git.kernel.org/stable/c/96e545410c4f74c89d496c1d5d9ef8d08f14368b"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a7c59e3e56f73b6914f843ac70c9e1e59921e1aa9d4cb6c67bf7e34b36ac34e6 · sha256:034ec53837213383… · /containers/cna/references/0

{"url":"https://git.kernel.org/stable/c/afebe44facc48a61761e885bbb7f0380d4a603ec"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a7c59e3e56f73b6914f843ac70c9e1e59921e1aa9d4cb6c67bf7e34b36ac34e6 · sha256:034ec53837213383… · /containers/cna/references/3

{"url":"https://git.kernel.org/stable/c/bbebd9425cad3573d1527441753899b926525a0f"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a7c59e3e56f73b6914f843ac70c9e1e59921e1aa9d4cb6c67bf7e34b36ac34e6 · sha256:034ec53837213383… · /containers/cna/references/1

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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