{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-26766", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.173Z", "datePublished": "2024-04-03T17:00:48.642Z", "dateUpdated": "2026-08-05T11:27:06.552Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:27:06.552Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/hfi1: Fix sdma.h tx->num_descs off-by-one error\n\nUnfortunately the commit `fd8958efe877` introduced another error\ncausing the `descs` array to overflow. This reults in further crashes\neasily reproducible by `sendmsg` system call.\n\n[ 1080.836473] general protection fault, probably for non-canonical address 0x400300015528b00a: 0000 [#1] PREEMPT SMP PTI\n[ 1080.869326] RIP: 0010:hfi1_ipoib_build_ib_tx_headers.constprop.0+0xe1/0x2b0 [hfi1]\n--\n[ 1080.974535] Call Trace:\n[ 1080.976990] \n[ 1081.021929] hfi1_ipoib_send_dma_common+0x7a/0x2e0 [hfi1]\n[ 1081.027364] hfi1_ipoib_send_dma_list+0x62/0x270 [hfi1]\n[ 1081.032633] hfi1_ipoib_send+0x112/0x300 [hfi1]\n[ 1081.042001] ipoib_start_xmit+0x2a9/0x2d0 [ib_ipoib]\n[ 1081.046978] dev_hard_start_xmit+0xc4/0x210\n--\n[ 1081.148347] __sys_sendmsg+0x59/0xa0\n\ncrash> ipoib_txreq 0xffff9cfeba229f00\nstruct ipoib_txreq {\n txreq = {\n list = {\n next = 0xffff9cfeba229f00,\n prev = 0xffff9cfeba229f00\n },\n descp = 0xffff9cfeba229f40,\n coalesce_buf = 0x0,\n wait = 0xffff9cfea4e69a48,\n complete = 0xffffffffc0fe0760 ,\n packet_len = 0x46d,\n tlen = 0x0,\n num_desc = 0x0,\n desc_limit = 0x6,\n next_descq_idx = 0x45c,\n coalesce_idx = 0x0,\n flags = 0x0,\n descs = {{\n qw = {0x8024000120dffb00, 0x4} # SDMA_DESC0_FIRST_DESC_FLAG (bit 63)\n }, {\n qw = { 0x3800014231b108, 0x4}\n }, {\n qw = { 0x310000e4ee0fcf0, 0x8}\n }, {\n qw = { 0x3000012e9f8000, 0x8}\n }, {\n qw = { 0x59000dfb9d0000, 0x8}\n }, {\n qw = { 0x78000e02e40000, 0x8}\n }}\n },\n sdma_hdr = 0x400300015528b000, <<< invalid pointer in the tx request structure\n sdma_status = 0x0, SDMA_DESC0_LAST_DESC_FLAG (bit 62)\n complete = 0x0,\n priv = 0x0,\n txq = 0xffff9cfea4e69880,\n skb = 0xffff9d099809f400\n}\n\nIf an SDMA send consists of exactly 6 descriptors and requires dword\npadding (in the 7th descriptor), the sdma_txreq descriptor array is not\nproperly expanded and the packet will overflow into the container\nstructure. This results in a panic when the send completion runs. The\nexact panic varies depending on what elements of the container structure\nget corrupted. The fix is to use the correct expression in\n_pad_sdma_tx_descs() to test the need to expand the descriptor array.\n\nWith this patch the crashes are no longer reproducible and the machine is\nstable." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The overflow is driven entirely by the local sender's skb layout (number of page frags and total length), reached via an ordinary `sendmsg`/`writev` syscall on a socket routed over the hfi1 IPoIB netdev, as the reporter's `__sys_sendmsg` → `ipoib_start_xmit` → `hfi1_ipoib_send` trace shows. A remote peer cannot dictate the local skb fragment layout, so this is a local syscall vector, not network.\nAC:L - There is no race and no memory-layout dependency: the attacker deterministically chooses 4 page fragments plus a payload length not divisible by 4, which makes `num_desc` equal `desc_limit` exactly when padding is appended. Every attempt with that shape overflows `descs[6]`.\nPR:L - Any unprivileged local account can send datagrams out an IPoIB interface; no capability, no `/dev/infiniband` or `/dev/hfi1` access, and no namespace trickery is required. The `hfi1_ipoib_send` path is reached from the generic `dev_hard_start_xmit` transmit path available to all users.\nUI:N - The attacker's own `sendmsg` call triggers the overflow and the subsequent completion/reuse of the corrupted txreq; no administrator or victim action is involved.\nS:U - The out-of-bounds write stays within kernel memory managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The overflow clobbers `ipoib_txreq.sdma_hdr`, a pointer that is later handed to `sdma_txadd_kvaddr()`/`dma_map_single()` as the packet-header DMA source, so corrupted-pointer contents can be DMA'd onto the fabric; more generally an attacker-triggered out-of-bounds write over adjacent pointer fields is memory corruption leverageable for disclosure.\nI:H - This is a straight out-of-bounds write of a 32-byte descriptor past `descs[NUM_DESC]` into the container structure, overwriting `sdma_hdr`, `priv` and `txq` (and `qp`/`wqe`/`ss` or a `list_head` in the verbs and user_sdma containers), which then serve as write targets and list-manipulation operands.\nA:H - The reporter reproduced an immediate general protection fault in `hfi1_ipoib_build_ib_tx_headers()` from the corrupted `sdma_hdr`, and the NULLed `txq`/`priv` guarantee a NULL dereference in the completion path — a repeatable kernel panic from an unprivileged syscall." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/hw/hfi1/sdma.c" ], "versions": [ { "version": "d1c1ee052d25ca23735eea912f843bc7834781b4", "lessThan": "115b7f3bc1dce590a6851a2dcf23dc1100c49790", "status": "affected", "versionType": "git" }, { "version": "40ac5cb6cbb01afa40881f78b4d2f559fb7065c4", "lessThan": "5833024a9856f454a964a198c63a57e59e07baf5", "status": "affected", "versionType": "git" }, { "version": "6cf8f3d690bb5ad31ef0f41a6206ecf5a068d179", "lessThan": "3f38d22e645e2e994979426ea5a35186102ff3c2", "status": "affected", "versionType": "git" }, { "version": "bd57756a7e43c7127d0eca1fc5868e705fd0f7ba", "lessThan": "47ae64df23ed1318e27bd9844e135a5e1c0e6e39", "status": "affected", "versionType": "git" }, { "version": "eeaf35f4e3b360162081de5e744cf32d6d1b0091", "lessThan": "52dc9a7a573dbf778625a0efca0fca55489f084b", "status": "affected", "versionType": "git" }, { "version": "fd8958efe8779d3db19c9124fce593ce681ac709", "lessThan": "a2fef1d81becf4ff60e1a249477464eae3c3bc2a", "status": "affected", "versionType": "git" }, { "version": "fd8958efe8779d3db19c9124fce593ce681ac709", "lessThan": "9034a1bec35e9f725315a3bb6002ef39666114d9", "status": "affected", "versionType": "git" }, { "version": "fd8958efe8779d3db19c9124fce593ce681ac709", "lessThan": "e6f57c6881916df39db7d95981a8ad2b9c3458d6", "status": "affected", "versionType": "git" }, { "version": "0ef9594936d1f078e8599a1cf683b052df2bec00", "status": "affected", "versionType": "git" }, { "version": "4.19.291", "lessThan": "4.19.308", "status": "affected", "versionType": "semver" }, { "version": "5.4.251", "lessThan": "5.4.270", "status": "affected", "versionType": "semver" }, { "version": "5.10.188", "lessThan": "5.10.211", "status": "affected", "versionType": "semver" }, { "version": "5.15.99", "lessThan": "5.15.150", "status": "affected", "versionType": "semver" }, { "version": "6.1.16", "lessThan": "6.1.80", "status": "affected", "versionType": "semver" }, { "version": "6.2.3", "lessThan": "6.3", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/hw/hfi1/sdma.c" ], "versions": [ { "version": "6.3", "status": "affected" }, { "version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.308", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.270", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.211", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.150", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.80", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.19", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.7", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "4.19.291", "versionEndExcluding": "4.19.308" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.251", "versionEndExcluding": "5.4.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.188", "versionEndExcluding": "5.10.211" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.99", "versionEndExcluding": "5.15.150" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.16", "versionEndExcluding": "6.1.80" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.6.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.7.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/115b7f3bc1dce590a6851a2dcf23dc1100c49790" }, { "url": "https://git.kernel.org/stable/c/5833024a9856f454a964a198c63a57e59e07baf5" }, { "url": "https://git.kernel.org/stable/c/3f38d22e645e2e994979426ea5a35186102ff3c2" }, { "url": "https://git.kernel.org/stable/c/47ae64df23ed1318e27bd9844e135a5e1c0e6e39" }, { "url": "https://git.kernel.org/stable/c/52dc9a7a573dbf778625a0efca0fca55489f084b" }, { "url": "https://git.kernel.org/stable/c/a2fef1d81becf4ff60e1a249477464eae3c3bc2a" }, { "url": "https://git.kernel.org/stable/c/9034a1bec35e9f725315a3bb6002ef39666114d9" }, { "url": "https://git.kernel.org/stable/c/e6f57c6881916df39db7d95981a8ad2b9c3458d6" } ], "title": "IB/hfi1: Fix sdma.h tx->num_descs 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