CVE-2026-99230

io_uring/cmd: don't leave list poison in ->hash_node

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-99230

Published

In the Linux kernel, the following vulnerability has been resolved: io_uring/cmd: don't leave list poison in ->hash_node io_uring_cmd_del_cancelable() uses hlist_del() to take a command off ->cancelable_uring_cmd, which leaves LIST_POISON1/2 behind in ->hash_node. Requests are recycled through the request cache without being reinitialised, and not every user of ->hash_node sets it up before it is used: If a vectored futex wait is woken while futex_wait_multiple_setup() is still queueing the futexes, io_futexv_wait() doesn't add the request to ->futex_list, and leaves the completion to the task_work queued by the wake up. io_futexv_complete() ends in __io_futex_complete(), whose hlist_del_init() is fine for a request that is unhashed, which is how all other users of the node leave it. If the request was a cancelable uring_cmd in its previous life, e.g. a ublk FETCH_REQ, it writes through LIST_POISON2: Oops: general protection fault, probably for non-canonical address KASAN: maybe wild-memory-access in range [0xdead000000000120-...] RIP: 0010:io_futexv_complete+0x219/0x420 Call Trace: tctx_task_work_run+0x804/0x950 tctx_task_work+0x71/0xa0 task_work_run+0x118/0x200 Leave the node unhashed.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-99230

Published

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "io_uring/uring_cmd.c"
                    ],
                    "versions": [
                        {
                            "version": "93b8cc60c37b9d17732b7a297e5dca29b50a990d",
                            "lessThan": "cc7f13d006fcefed9564bd79f135b51d344e9c77",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "93b8cc60c37b9d17732b7a297e5dca29b50a990d",
                            "lessThan": "2d5af21422060c088f6e4fb0f1e7dcf5bcdd6707",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "93b8cc60c37b9d17732b7a297e5dca29b50a990d",
                            "lessThan": "685b49483200384d7f49d338af476e26e6824637",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "93b8cc60c37b9d17732b7a297e5dca29b50a990d",
                            "lessThan": "c4fe1024b2f3f40f8010591a0c0ad541e2883eda",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "93b8cc60c37b9d17732b7a297e5dca29b50a990d",
                            "lessThan": "4c83e39f4d1944d7146fd06094f2c8053238d55c",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "io_uring/uring_cmd.c"
                    ],
                    "versions": [
                        {
                            "version": "6.7",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.7",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.115",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.60",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.14",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3.2",
                            "lessThanOrEqual": "7.3.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.4-rc1",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON