230 lines
12 KiB
JSON
230 lines
12 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-2024-26800",
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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": "2024-02-19T14:20:24.179Z",
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"datePublished": "2024-04-04T08:20:28.554Z",
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"dateUpdated": "2026-08-05T11:27:21.641Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:27:21.641Z"
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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\ntls: fix use-after-free on failed backlog decryption\n\nWhen the decrypt request goes to the backlog and crypto_aead_decrypt\nreturns -EBUSY, tls_do_decryption will wait until all async\ndecryptions have completed. If one of them fails, tls_do_decryption\nwill return -EBADMSG and tls_decrypt_sg jumps to the error path,\nreleasing all the pages. But the pages have been passed to the async\ncallback, and have already been released by tls_decrypt_done.\n\nThe only true async case is when crypto_aead_decrypt returns\n -EINPROGRESS. With -EBUSY, we already waited so we can tell\ntls_sw_recvmsg that the data is available for immediate copy, but we\nneed to notify tls_decrypt_sg (via the new ->async_done flag) that the\nmemory has already been released."
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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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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:N - The bug is triggered entirely by TLS records arriving from the remote peer on a kTLS (net/tls TLS_SW) socket — a corrupted AEAD tag produces the -EBADMSG that drives the double-free path, and record volume drives the crypto backlog. No local access is needed.\nAC:L - The attacker controls both required conditions: flooding TLS records across connections saturates the crypto backlog to force -EBUSY, and a single record with a bad GCM tag deterministically forces -EBADMSG, after which the error path unconditionally re-frees memory the completion callback already released.\nPR:N - kTLS is armed after a userspace TLS handshake, and typical kTLS servers (nginx/OpenSSL TLS termination) accept unauthenticated clients with no client certificate, so any anonymous remote peer can drive the vulnerable receive path.\nUI:N - The victim socket is processed by the server's normal recvmsg loop; no action by a local user or administrator is required.\nS:U - The double-free and page refcount underflow corrupt kernel heap and page state within the same kernel security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The duplicated put_page() underflows the refcount of pages pinned from the user's recvmsg buffer, so a page still mapped into the process can be reallocated to the kernel and read directly; the slab double-free of the aead_req/dctx block additionally enables freelist-based disclosure.\nI:H - A double-free of an attacker-size-influenced kmalloc object gives SLUB freelist corruption, and the underflowed user-mapped page yields a write primitive into reallocated kernel memory — both are standard routes to arbitrary write and control-flow hijack.\nA:H - The double kfree() and page refcount underflow reliably corrupt allocator state, producing BUG/KASAN splats, oopses, and kernel panics, and the condition can be re-triggered repeatedly by a remote peer."
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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/tls/tls_sw.c"
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"timestamp": "2024-07-31T20:01:08.576744Z",
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"id": "CVE-2024-26800",
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