block: reject polled dio with user integrity metadata
CVE-2026-98821 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2026-98821, released October 19, 2026. It is not reported as exploited. Patch Radar priority: High.
In the Linux kernel, the following vulnerability has been resolved: block: reject polled dio with user integrity metadata IOCB_HAS_METADATA leaves iocb->private as a uio_meta, while iocb_bio_iopoll() expects a bio. Since 2729a60bbfb9, metadata I/O always uses __blkdev_direct_IO(), which never publishes the bio for polling, so IOPOLL calls bio_poll() on the uio_meta. Reproducer: io_uring IOPOLL plus a PI attribute on an integrity device (scsi_debug dif=1 dix=1). KASAN reports: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004 KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] RIP: 0010:bio_poll+0x9d/0x4b0 Call Trace: iocb_bio_iopoll+0x5b/0x80 io_uring_classic_poll+0xf3/0x140 io_do_iopoll+0x4e3/0xc00 io_iopoll_check+0x275/0x560 __do_sys_io_uring_enter+0x2e5/0x720 Return -EOPNOTSUPP when HIPRI is combined with user metadata.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| bpftool6.18 · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| bpftool6.18-debuginfo · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| kernel-livepatch-6.18.56-125.164 · amzn 2023 | 1:1.0-0.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| kernel6.18 · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| kernel6.18-debuginfo · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| kernel6.18-debuginfo-common-aarch64 · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| kernel6.18-debuginfo-common-x86_64 · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| kernel6.18-devel · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| kernel6.18-headers · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| kernel6.18-modules-extra · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| kernel6.18-modules-extra-common · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| kernel6.18-tools · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| kernel6.18-tools-debuginfo · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| kernel6.18-tools-devel · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| linux · Debian 14 | 7.2.10-1 | DEBIAN-CVE-2026-98821 | Oct 19, 2026 |
| microvm-kernel6.18 · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| perf6.18 · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| perf6.18-debuginfo · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| python3-perf6.18 · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
| python3-perf6.18-debuginfo · amzn 2023 | 1:6.18.56-125.164.amzn2023 | ALAS2023-2026-3251 | Nov 7, 2026 |
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