{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-52974", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.375Z", "datePublished": "2026-06-24T16:28:51.826Z", "dateUpdated": "2026-08-05T12:32:16.022Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:32:16.022Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: fix strparser anchor skb leak on offload RX setup failure\n\nWhen tls_set_device_offload_rx() fails at tls_dev_add(), the error path\ncalls tls_sw_free_resources_rx() to clean up the SW context that was\ninitialized by tls_set_sw_offload(). This function calls\ntls_sw_release_resources_rx() (which stops the strparser via\ntls_strp_stop()) and tls_sw_free_ctx_rx() (which kfrees the context),\nbut never frees the anchor skb that was allocated by alloc_skb(0) in\ntls_strp_init().\n\nNote that tls_sw_free_resources_rx() is exclusively used for this\n\"failed to start offload\" code path, there's no other caller.\n\nThe leak did not exist before commit 84c61fe1a75b (\"tls: rx: do not use\nthe standard strparser\"), because the standard strparser doesn't try\nto pre-allocate an skb.\n\nThe normal close path in tls_sk_proto_close() handles cleanup by calling\ntls_sw_strparser_done() (which calls tls_strp_done()) after dropping\nthe socket lock, because tls_strp_done() does cancel_work_sync() and\nthe strparser work handler takes the socket lock." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - A remote TLS peer can plausibly trigger this through a network-facing kTLS-enabled service that installs TLS_RX state after handshake on a TLS RX offload-capable NIC. The direct kernel path is setsockopt-driven, but the vulnerable subsystem is kTLS receive/offload setup for network connections and can be reached per remote connection.\nAC:L - There is no race or fragile timing requirement; the attacker can repeatedly drive RX state setup and can plausibly force tls_dev_add() failure via unsupported TLS 1.2 RX offload parameters or exhausted offload resources. The required offload-capable deployment is a reasonable server scenario for this subsystem.\nPR:N - In the network-facing kTLS service scenario, the attacker needs no local account or prior authentication to initiate TLS connections that cause the service to install RX state. Any application-level authentication would occur after the connection setup path.\nUI:N - No victim user action is required beyond the target service automatically handling incoming TLS connections. The attacker can repeat the trigger by opening connections.\nS:U - The impact remains within the kernel and network stack security authority. There is no VM escape, IOMMU bypass, or cross-scope boundary crossing.\nC:N - The bug leaks an internal zero-length anchor skb object by losing its reference; it does not expose kernel memory contents to the attacker. No read primitive or information disclosure was identified.\nI:N - The issue is a missing cleanup in an error path and does not corrupt memory or modify attacker-chosen kernel data. No write primitive or control-flow impact was identified.\nA:H - The leaked skb is kernel memory and the failing offload setup path can be triggered repeatedly, allowing unbounded memory consumption. Related strparser skb leak precedent treats repeatable network-triggered memory exhaustion as high availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tls/tls.h", "net/tls/tls_strp.c", "net/tls/tls_sw.c" ], "versions": [ { "version": "84c61fe1a75b4255df1e1e7c054c9e6d048da417", "lessThan": "0c9f399b37ce22a5ed94cc51f03ed07ac7f38e32", "status": "affected", "versionType": "git" }, { "version": "84c61fe1a75b4255df1e1e7c054c9e6d048da417", "lessThan": "688f12aa44511dd57e448eb670075c6302ad1dc1", "status": "affected", "versionType": "git" }, { "version": "84c61fe1a75b4255df1e1e7c054c9e6d048da417", "lessThan": "3c405dfa9619e506e75b8e41f8b29a5b99731877", "status": "affected", "versionType": "git" }, { "version": "84c61fe1a75b4255df1e1e7c054c9e6d048da417", "lessThan": "9c54e76f8d6eb11735918777ef0e0509e089557d", "status": "affected", "versionType": "git" }, { "version": "84c61fe1a75b4255df1e1e7c054c9e6d048da417", "lessThan": "bd07fe6c38b9e44ff3fc02692a53f095c5cc9afc", "status": "affected", "versionType": "git" }, { "version": "84c61fe1a75b4255df1e1e7c054c9e6d048da417", "lessThan": "58689498ca3384851145a754dbb1d8ed1cf9fb54", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tls/tls.h", "net/tls/tls_strp.c", "net/tls/tls_sw.c" ], "versions": [ { "version": "6.0", "status": "affected" }, { "version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "6.0", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0c9f399b37ce22a5ed94cc51f03ed07ac7f38e32" }, { "url": "https://git.kernel.org/stable/c/688f12aa44511dd57e448eb670075c6302ad1dc1" }, { "url": "https://git.kernel.org/stable/c/3c405dfa9619e506e75b8e41f8b29a5b99731877" }, { "url": "https://git.kernel.org/stable/c/9c54e76f8d6eb11735918777ef0e0509e089557d" }, { "url": "https://git.kernel.org/stable/c/bd07fe6c38b9e44ff3fc02692a53f095c5cc9afc" }, { "url": "https://git.kernel.org/stable/c/58689498ca3384851145a754dbb1d8ed1cf9fb54" } ], "title": "net: tls: fix strparser anchor skb leak on offload RX setup failure", "x_generator": { "engine": "bippy-1.2.0" } } } }