{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31774", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.140Z", "datePublished": "2026-05-01T14:15:02.903Z", "dateUpdated": "2026-05-01T14:15:02.903Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-01T14:15:02.903Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/net: fix slab-out-of-bounds read in io_bundle_nbufs()\n\nsqe->len is __u32 but gets stored into sr->len which is int. When\nuserspace passes sqe->len values exceeding INT_MAX (e.g. 0xFFFFFFFF),\nsr->len overflows to a negative value. This negative value propagates\nthrough the bundle recv/send path:\n\n 1. io_recv(): sel.val = sr->len (ssize_t gets -1)\n 2. io_recv_buf_select(): arg.max_len = sel->val (size_t gets\n 0xFFFFFFFFFFFFFFFF)\n 3. io_ring_buffers_peek(): buf->len is not clamped because max_len\n is astronomically large\n 4. iov[].iov_len = 0xFFFFFFFF flows into io_bundle_nbufs()\n 5. io_bundle_nbufs(): min_t(int, 0xFFFFFFFF, ret) yields -1,\n causing ret to increase instead of decrease, creating an\n infinite loop that reads past the allocated iov[] array\n\nThis results in a slab-out-of-bounds read in io_bundle_nbufs() from\nthe kmalloc-64 slab, as nbufs increments past the allocated iovec\nentries.\n\n BUG: KASAN: slab-out-of-bounds in io_bundle_nbufs+0x128/0x160\n Read of size 8 at addr ffff888100ae05c8 by task exp/145\n Call Trace:\n io_bundle_nbufs+0x128/0x160\n io_recv_finish+0x117/0xe20\n io_recv+0x2db/0x1160\n\nFix this by rejecting negative sr->len values early in both\nio_sendmsg_prep() and io_recvmsg_prep(). Since sqe->len is __u32,\nany value > INT_MAX indicates overflow and is not a valid length."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/net.c"], "versions": [{"version": "a05d1f625c7aa681d8816bc0f10089289ad07aad", "lessThan": "90ced24c500ad4e129e9e34b7e56fd7849e350b6", "status": "affected", "versionType": "git"}, {"version": "a05d1f625c7aa681d8816bc0f10089289ad07aad", "lessThan": "c314b405dcc4d8b9041124f928f81715d6328bec", "status": "affected", "versionType": "git"}, {"version": "a05d1f625c7aa681d8816bc0f10089289ad07aad", "lessThan": "1b655cd311344117d3052f6552cb20d9901c9d7c", "status": "affected", "versionType": "git"}, {"version": "a05d1f625c7aa681d8816bc0f10089289ad07aad", "lessThan": "b948f9d5d3057b01188e36664e7c7604d1c8ecb5", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/net.c"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/90ced24c500ad4e129e9e34b7e56fd7849e350b6"}, {"url": "https://git.kernel.org/stable/c/c314b405dcc4d8b9041124f928f81715d6328bec"}, {"url": "https://git.kernel.org/stable/c/1b655cd311344117d3052f6552cb20d9901c9d7c"}, {"url": "https://git.kernel.org/stable/c/b948f9d5d3057b01188e36664e7c7604d1c8ecb5"}], "title": "io_uring/net: fix slab-out-of-bounds read in io_bundle_nbufs()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/net: fix slab-out-of-bounds read in io_bundle_nbufs()\n\nsqe->len is __u32 but gets stored into sr->len which is int. When\nuserspace passes sqe->len values exceeding INT_MAX (e.g. 0xFFFFFFFF),\nsr->len overflows to a negative value. This negative value propagates\nthrough the bundle recv/send path:\n\n 1. io_recv(): sel.val = sr->len (ssize_t gets -1)\n 2. io_recv_buf_select(): arg.max_len = sel->val (size_t gets\n 0xFFFFFFFFFFFFFFFF)\n 3. io_ring_buffers_peek(): buf->len is not clamped because max_len\n is astronomically large\n 4. iov[].iov_len = 0xFFFFFFFF flows into io_bundle_nbufs()\n 5. io_bundle_nbufs(): min_t(int, 0xFFFFFFFF, ret) yields -1,\n causing ret to increase instead of decrease, creating an\n infinite loop that reads past the allocated iov[] array\n\nThis results in a slab-out-of-bounds read in io_bundle_nbufs() from\nthe kmalloc-64 slab, as nbufs increments past the allocated iovec\nentries.\n\n BUG: KASAN: slab-out-of-bounds in io_bundle_nbufs+0x128/0x160\n Read of size 8 at addr ffff888100ae05c8 by task exp/145\n Call Trace:\n io_bundle_nbufs+0x128/0x160\n io_recv_finish+0x117/0xe20\n io_recv+0x2db/0x1160\n\nFix this by rejecting negative sr->len values early in both\nio_sendmsg_prep() and io_recvmsg_prep(). Since sqe->len is __u32,\nany value > INT_MAX indicates overflow and is not a valid length."}], "id": "CVE-2026-31774", "lastModified": "2026-05-01T15:24:14.893", "metrics": {}, "published": "2026-05-01T15:16:40.720", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1b655cd311344117d3052f6552cb20d9901c9d7c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/90ced24c500ad4e129e9e34b7e56fd7849e350b6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b948f9d5d3057b01188e36664e7c7604d1c8ecb5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c314b405dcc4d8b9041124f928f81715d6328bec"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a05d1f625c7aa681d8816bc0f10089289ad07aad,90ced24c500ad4e129e9e34b7e56fd7849e350b6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a05d1f625c7aa681d8816bc0f10089289ad07aad,c314b405dcc4d8b9041124f928f81715d6328bec)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a05d1f625c7aa681d8816bc0f10089289ad07aad,1b655cd311344117d3052f6552cb20d9901c9d7c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a05d1f625c7aa681d8816bc0f10089289ad07aad,b948f9d5d3057b01188e36664e7c7604d1c8ecb5)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.81,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.22,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.12,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-01T17:15:21.416707+00:00", "updated": "2026-05-01T17:15:21.416772+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}