302 lines
17 KiB
JSON
302 lines
17 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-2022-48629",
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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": "2024-02-25T13:44:28.315Z",
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"datePublished": "2024-03-05T11:18:06.562Z",
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"dateUpdated": "2026-08-05T08:51:33.070Z"
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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": "2026-08-05T08:51:33.070Z"
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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\ncrypto: qcom-rng - ensure buffer for generate is completely filled\n\nThe generate function in struct rng_alg expects that the destination\nbuffer is completely filled if the function returns 0. qcom_rng_read()\ncan run into a situation where the buffer is partially filled with\nrandomness and the remaining part of the buffer is zeroed since\nqcom_rng_generate() doesn't check the return value. This issue can\nbe reproduced by running the following from libkcapi:\n\n kcapi-rng -b 9000000 > OUTFILE\n\nThe generated OUTFILE will have three huge sections that contain all\nzeros, and this is caused by the code where the test\n'val & PRNG_STATUS_DATA_AVAIL' fails.\n\nLet's fix this issue by ensuring that qcom_rng_read() always returns\nwith a full buffer if the function returns success. Let's also have\nqcom_rng_generate() return the correct value.\n\nHere's some statistics from the ent project\n(https://www.fourmilab.ch/random/) that shows information about the\nquality of the generated numbers:\n\n $ ent -c qcom-random-before\n Value Char Occurrences Fraction\n 0 606748 0.067416\n 1 33104 0.003678\n 2 33001 0.003667\n ...\n 253 � 32883 0.003654\n 254 � 33035 0.003671\n 255 � 33239 0.003693\n\n Total: 9000000 1.000000\n\n Entropy = 7.811590 bits per byte.\n\n Optimum compression would reduce the size\n of this 9000000 byte file by 2 percent.\n\n Chi square distribution for 9000000 samples is 9329962.81, and\n randomly would exceed this value less than 0.01 percent of the\n times.\n\n Arithmetic mean value of data bytes is 119.3731 (127.5 = random).\n Monte Carlo value for Pi is 3.197293333 (error 1.77 percent).\n Serial correlation coefficient is 0.159130 (totally uncorrelated =\n 0.0).\n\nWithout this patch, the results of the chi-square test is 0.01%, and\nthe numbers are certainly not random according to ent's project page.\nThe results improve with this patch:\n\n $ ent -c qcom-random-after\n Value Char Occurrences Fraction\n 0 35432 0.003937\n 1 35127 0.003903\n 2 35424 0.003936\n ...\n 253 � 35201 0.003911\n 254 � 34835 0.003871\n 255 � 35368 0.003930\n\n Total: 9000000 1.000000\n\n Entropy = 7.999979 bits per byte.\n\n Optimum compression would reduce the size\n of this 9000000 byte file by 0 percent.\n\n Chi square distribution for 9000000 samples is 258.77, and randomly\n would exceed this value 42.24 percent of the times.\n\n Arithmetic mean value of data bytes is 127.5006 (127.5 = random).\n Monte Carlo value for Pi is 3.141277333 (error 0.01 percent).\n Serial correlation coefficient is 0.000468 (totally uncorrelated =\n 0.0).\n\nThis change was tested on a Nexus 5 phone (msm8974 SoC)."
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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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
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"baseScore": 8.1,
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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:A - On Qualcomm phones (the driver's primary deployment; fix tested on Nexus 5), qcom-rng becomes crypto_default_rng and feeds Bluetooth SMP ECDH private-key generation (smp→ecdh-nist-p256→ecc_gen_privkey), so an adjacent Bluetooth attacker can exploit weak pairing keys.\nAC:L - qcom_rng_read() stops at the first clear PRNG_STATUS_DATA_AVAIL without waiting, so any multi-word generate (including 32-byte ECDH keys) systematically underfills while qcom_rng_generate() still returns 0; the fix's readl_poll_timeout confirms waiting is required for reliable full fills.\nPR:N - A Bluetooth-adjacent attacker needs no local account or capabilities on the victim; the weak keys are produced by in-kernel SMP pairing crypto. (AF_ALG rng is also reachable by unprivileged local users, but the highest-impact path is unauthenticated adjacent Bluetooth.)\nUI:N - Exploitation rides the normal Bluetooth SMP/LE Secure Connections key-agreement exchange; no additional victim action beyond ordinary pairing protocol participation is required.\nS:U - Impact stays within the device's own kernel crypto authority (broken Bluetooth link keys/traffic); there is no VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - Underfilled RNG output yields low-entropy ECDH private keys and other crypto_default_rng secrets (and AF_ALG returns large zero runs), allowing decryption of Bluetooth traffic and disclosure of material that should have been confidential.\nI:H - The same weak ECDH/session keys enable MITM and forgery of Bluetooth SMP-protected traffic, and equally undermine integrity of any MAC/signature keys drawn from the underfilled stdrng.\nA:N - This defect only returns success with incomplete/zero-padded random data; it does not oops, panic, hang, or loop (the related infinite-loop DoS is CVE-2022-48630 from a later fix)."
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}
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]
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"product": "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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"drivers/crypto/qcom-rng.c"
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"title": "crypto: qcom-rng - ensure buffer for generate is completely filled",
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