CVE-2026-23275io_uring: ensure ctx->rings is stable for task work flags manipulation
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: io_uring: ensure ctx->rings is stable for task work flags manipulation If DEFER_TASKRUN | SETUP_TASKRUN is used and task work is added while the ring is being resized, it's possible for the OR'ing of IORING_SQ_TASKRUN to happen in the small window of swapping into the new rings and the old rings being freed. Prevent this by adding a 2nd ->rings pointer, ->rings_rcu, which is protected by RCU. The task work flags manipulation is inside RCU already, and if the resize ring freeing is done post an RCU synchronize, then there's no need to add locking to the fast path of task work additions. Note: this is only done for DEFER_TASKRUN, as that's the only setup mode that supports ring resizing. If this ever changes, then they too need to use the io_ctx_mark_taskrun() helper.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 79cfe9e59c2a12c3b3faeeefe38d23f3d8030972 builds before 7cc4530b3e952d4a5947e1e55d06620d8845d4f5; 79cfe9e59c2a12c3b3faeeefe38d23f3d8030972 builds before 46dc07d5f31411cc023f3bf1f4a23a07bf6e0ed1; from 79cfe9e59c2a12c3b3faeeefe38d23f3d8030972 before 96189080265e6bb5dde3a4afbaf947af493e3f82 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.13 before 6.18.19; from 6.19 before 6.19.9; 7.0; 7.0; 7.0 | NVD |
References
- https://git.kernel.org/stable/c/7cc4530b3e952d4a5947e1e55d06620d8845d4f5patch
- https://git.kernel.org/stable/c/46dc07d5f31411cc023f3bf1f4a23a07bf6e0ed1patch
- https://git.kernel.org/stable/c/96189080265e6bb5dde3a4afbaf947af493e3f82patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.