227 lines
12 KiB
JSON
227 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-2021-47131",
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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": "2024-03-04T18:12:48.840Z",
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"datePublished": "2024-03-15T20:14:34.647Z",
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"dateUpdated": "2026-08-05T08:46:13.224Z"
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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": "2026-08-05T08:46:13.224Z"
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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/tls: Fix use-after-free after the TLS device goes down and up\n\nWhen a netdev with active TLS offload goes down, tls_device_down is\ncalled to stop the offload and tear down the TLS context. However, the\nsocket stays alive, and it still points to the TLS context, which is now\ndeallocated. If a netdev goes up, while the connection is still active,\nand the data flow resumes after a number of TCP retransmissions, it will\nlead to a use-after-free of the TLS context.\n\nThis commit addresses this bug by keeping the context alive until its\nnormal destruction, and implements the necessary fallbacks, so that the\nconnection can resume in software (non-offloaded) kTLS mode.\n\nOn the TX side tls_sw_fallback is used to encrypt all packets. The RX\nside already has all the necessary fallbacks, because receiving\nnon-decrypted packets is supported. The thing needed on the RX side is\nto block resync requests, which are normally produced after receiving\nnon-decrypted packets.\n\nThe necessary synchronization is implemented for a graceful teardown:\nfirst the fallbacks are deployed, then the driver resources are released\n(it used to be possible to have a tls_dev_resync after tls_dev_del).\n\nA new flag called TLS_RX_DEV_DEGRADED is added to indicate the fallback\nmode. It's used to skip the RX resync logic completely, as it becomes\nuseless, and some objects may be released (for example, resync_async,\nwhich is allocated and freed by the driver)."
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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:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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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:N - The UAF is reached when a remote TLS peer sends data on an existing kTLS hardware-offloaded TCP connection after the NIC flaps, hitting net/tls RX resync paths that dereference driver state freed by tls_dev_del.\nAC:H - Exploitation requires the offload netdev to go down and back up while the connection stays alive, which a remote peer cannot force; once that state exists, sending traffic reliably triggers the bug.\nPR:N - A remote TLS client or peer needs no local account or privileges—only an established connection to a host using kTLS device offload (for example HTTPS with NIC TLS offload).\nUI:N - No additional user action is required beyond ordinary connection and data transfer after the device cycle; the attacker does not need a victim to open a file or click anything.\nS:U - Impact is confined to the host kernel that owns the TLS offload context; this is standard kernel memory corruption without a VM/IOMMU or other security-authority boundary cross.\nC:H - Use-after-free of the driver RX resync object (and related offload state) enables heap reuse and arbitrary read primitives per UAF scoring guidance.\nI:H - The same UAF is exploitable for heap spray and control-flow hijacking/arbitrary write, and the missing TX fallback can also mishandle post-teardown xmit state.\nA:H - Dereferencing freed resync_async or calling tls_dev_resync after tls_dev_del can oops/panic the kernel, so availability impact is High."
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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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"include/net/tls.h",
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"net/tls/tls_device.c",
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"net/tls/tls_device_fallback.c",
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"net/tls/tls_main.c"
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],
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"versions": [
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{
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"lessThan": "f1d4184f128dede82a59a841658ed40d4e6d3aa2",
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"status": "affected",
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"versionType": "git"
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},
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"status": "affected",
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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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"include/net/tls.h",
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"net/tls/tls_device.c",
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"net/tls/tls_device_fallback.c",
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"net/tls/tls_main.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": "5.10.43",
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"lessThanOrEqual": "5.10.*",
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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": "5.12.10",
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"lessThanOrEqual": "5.12.*",
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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": "5.13",
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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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"versionStartIncluding": "4.18",
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"versionEndExcluding": "5.10.43"
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"references": [
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"url": "https://git.kernel.org/stable/c/f1d4184f128dede82a59a841658ed40d4e6d3aa2"
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}
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],
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"title": "net/tls: Fix use-after-free after the TLS device goes down and up",
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"content": {
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"id": "CVE-2021-47131",
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"role": "CISA Coordinator",
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"options": [
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"version": "2.0.3",
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"timestamp": "2024-03-19T15:23:46.487605Z"
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