256 lines
14 KiB
JSON
256 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-80982",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-26T14:34:25.811Z",
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"datePublished": "2026-09-11T19:42:42.243Z",
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"dateUpdated": "2026-10-19T08:46:06.717Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:46:06.717Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix use-after-free in smc_rx_pipe_buf_release()\n\nsmc_rx_splice() hands RMB pages to a pipe and takes a socket reference\nper entry so the smc_sock stays alive until the reader finishes. The\nconnection does not: a concurrent close runs smc_conn_free(), which\nreleases the receive buffer back to the link group pool.\n\nsmc_rx_pipe_buf_release() tests sk_state before taking the socket lock.\nThe state can change between the test and the lock, and\nsmc_rx_update_cons() then dereferences conn->rmb_desc and walks\nconn->lgr, which smc_conn_free() has already released. On the\nis_reg_err path smcr_buf_unuse() frees the descriptor outright, so\nthis is a use-after-free.\n\nTake the socket lock first and test conn->freed instead.\nsmc_conn_free() sets that flag before releasing anything, and every\ncaller holds the socket lock. The two paths exclude each other: either\nthe pipe release runs first with everything valid, or it sees the flag\nand skips the update."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The UAF is in smc_rx_pipe_buf_release(), a pipe_buf_ops.release callback reached only via local splice() on an AF_SMC socket (syscall -> sock_splice_read -> smc_splice_read -> smc_rx_recvmsg -> smc_rx_splice). A remote SMC peer can supply RMB data or close the connection, but cannot invoke the splice pipe-buffer release path by itself.\nAC:L - The attacker controls both sides of the TOCTOU: one thread splices SMC Rx data into a pipe and then reads or closes it (unlocked sk_state check, then lock_sock), while another closes the socket so smc_conn_free() drops rmb_desc/lgr in that window. The race is fully attacker-driven and retryable.\nPR:L - socket(AF_SMC) or IPPROTO_SMC, connect/listen (loopback-ism, ISM, or RoCE), splice(2), and close(2) have no capability checks and are available to an unprivileged local user. User-namespace admin rights are not required.\nUI:N - A single unprivileged process can act as both SMC endpoints on loopback or a local fabric, splice received data into a pipe, and race close() against pipe-buffer release. No victim user action is required.\nS:U - The corruption is confined to kernel objects (smc_buf_desc, smc_link_group) in the same kernel security authority. This is standard kernel memory corruption, not a VM, IOMMU, or sandbox boundary escape.\nC:H - smc_rx_update_cons() dereferences conn->rmb_desc and walks conn->lgr after smc_conn_free()/smcr_buf_unuse() released them; on the is_reg_err path smc_buf_free() frees the descriptor outright. Per kernel CVSS guidance, this UAF of heap objects enables arbitrary kernel-memory disclosure.\nI:H - The same UAF writes consumer cursors and may call smc_tx_consumer_update() -> smc_cdc_get_slot_and_msg_send() or queue_delayed_work on conn->lgr->tx_wq after the link group is freed, enabling heap reuse, arbitrary write, and control-flow hijack.\nA:H - Dereferencing the freed rmb_desc or link group produces a kernel oops or panic. Use-after-free on this path crashes the host even when not fully exploited, and the attacker can repeat the race at will."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/smc/smc_rx.c"
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],
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"versions": [
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{
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"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
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"lessThan": "dadd97c8296b23aa816e91ed70041820ae087baa",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
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"lessThan": "df441f3efbb50eb0f120b8de4bf441c31fb0551d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
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"lessThan": "6a644a7340df978785f3109d1e0726a982ce2c6f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
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"lessThan": "0761e49aa78c2f1362511054c6e9670653858837",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
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"lessThan": "0926f59ca0f94120895b92180c636a48d0ed3a6d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
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"lessThan": "c924884743e948e25625b7fbf3ee2a9325a204a7",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/smc/smc_rx.c"
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],
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"versions": [
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{
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"version": "4.18",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.18",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.188",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.157",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.109",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.50",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.18",
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"versionEndExcluding": "6.1.188"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.18",
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"versionEndExcluding": "6.6.157"
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/dadd97c8296b23aa816e91ed70041820ae087baa"
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},
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{
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"url": "https://git.kernel.org/stable/c/df441f3efbb50eb0f120b8de4bf441c31fb0551d"
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},
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"url": "https://git.kernel.org/stable/c/6a644a7340df978785f3109d1e0726a982ce2c6f"
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},
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{
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"url": "https://git.kernel.org/stable/c/0761e49aa78c2f1362511054c6e9670653858837"
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},
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{
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"url": "https://git.kernel.org/stable/c/0926f59ca0f94120895b92180c636a48d0ed3a6d"
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},
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{
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"url": "https://git.kernel.org/stable/c/c924884743e948e25625b7fbf3ee2a9325a204a7"
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}
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],
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"title": "net/smc: fix use-after-free in smc_rx_pipe_buf_release()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-80982",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:21:50.317154Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:26:37.540Z"
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}
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}
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]
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}
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} |