{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-54306", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-30T12:06:44.529Z", "datePublished": "2025-12-30T12:23:39.833Z", "dateUpdated": "2026-08-05T09:19:05.796Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:19:05.796Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: avoid hanging tasks on the tx_lock\n\nsyzbot sent a hung task report and Eric explains that adversarial\nreceiver may keep RWIN at 0 for a long time, so we are not guaranteed\nto make forward progress. Thread which took tx_lock and went to sleep\nmay not release tx_lock for hours. Use interruptible sleep where\npossible and reschedule the work if it can't take the lock.\n\nTesting: existing selftest passes" } ], "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 - The condition that causes the tx_lock holder to sleep indefinitely is a zero TCP receive window advertised by the remote TLS peer, so a remote attacker on the network triggers the hang purely through TCP-level behavior against a kTLS-using service (nginx/OpenSSL kTLS, NFS-over-TLS tlshd, etc.). Per kernel scoring guidance, net/tls bugs driven by a remote peer are Network.\nAC:L - The attacker deterministically creates and holds the zero-window condition simply by not reading from the socket; there is no race to win, no memory-layout dependency, and no condition outside the attacker's control. A single sender is sufficient because the partial-send path itself schedules tx_work, which then blocks a kworker on the mutex.\nPR:N - The attacker is just an ordinary TLS peer of the victim service and needs no credentials on the target; for a public HTTPS/TLS endpoint the kTLS session is established with no authentication. No local account or capability on the victim system is required.\nUI:N - The victim service simply serves data over its normal kTLS send path; no administrator or user action beyond routine operation is needed. The hang occurs automatically once the attacker stalls the window.\nS:U - The impact is confined to the kernel/system that owns the vulnerable socket — blocked tasks, pinned kworkers, and a potential panic. No security boundary such as a VM, IOMMU, or sandbox is crossed.\nC:N - The defect is a lock-hold/scheduling problem with no out-of-bounds access, no use-after-free, and no uninitialized data exposure. No kernel memory contents are disclosed to the attacker.\nI:N - Nothing is written out of bounds or modified incorrectly; the record data itself is unaffected and eventually sent or discarded normally. There is no write primitive or control-flow influence available from this bug.\nA:H - The uninterruptible mutex waiters (tx_work_handler kworker, concurrent senders, and close()/exit via cancel_delayed_work_sync) become unkillable D-state tasks, tripping the hung-task watchdog and causing a kernel panic on systems with hung_task_panic=1. Even without panic, each stalled connection permanently pins a global system_wq worker (max_active 256), so repeated attacker connections starve the shared workqueue and wedge unrelated kernel work." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tls/tls_sw.c" ], "versions": [ { "version": "79ffe6087e9145d2377385cac48d0d6a6b4225a5", "lessThan": "bde541a57b4204d0a800afbbd3d1c06c9cdb133f", "status": "affected", "versionType": "git" }, { "version": "79ffe6087e9145d2377385cac48d0d6a6b4225a5", "lessThan": "7123a4337bf73132bbfb5437e4dc83ba864a9a1e", "status": "affected", "versionType": "git" }, { "version": "79ffe6087e9145d2377385cac48d0d6a6b4225a5", "lessThan": "be5d5d0637fd88c18ee76024bdb22649a1de00d6", "status": "affected", "versionType": "git" }, { "version": "79ffe6087e9145d2377385cac48d0d6a6b4225a5", "lessThan": "1f800f6aae57d2d8f63d32fff383017cbc11cf65", "status": "affected", "versionType": "git" }, { "version": "79ffe6087e9145d2377385cac48d0d6a6b4225a5", "lessThan": "ccf1ccdc5926907befbe880b562b2a4b5f44c087", "status": "affected", "versionType": "git" }, { "version": "79ffe6087e9145d2377385cac48d0d6a6b4225a5", "lessThan": "f3221361dc85d4de22586ce8441ec2c67b454f5d", "status": "affected", "versionType": "git" }, { "version": "c8d6817345f4ba228d07380e571676405e112872", "status": "affected", "versionType": "git" }, { "version": "5.3.11", "lessThan": "5.4", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tls/tls_sw.c" ], "versions": [ { "version": "5.4", "status": "affected" }, { "version": "0", "lessThan": "5.4", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.235", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.173", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.100", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.18", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2.5", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3", "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": "5.4", "versionEndExcluding": "5.4.235" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "5.10.173" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "5.15.100" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.1.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/bde541a57b4204d0a800afbbd3d1c06c9cdb133f" }, { "url": "https://git.kernel.org/stable/c/7123a4337bf73132bbfb5437e4dc83ba864a9a1e" }, { "url": "https://git.kernel.org/stable/c/be5d5d0637fd88c18ee76024bdb22649a1de00d6" }, { "url": "https://git.kernel.org/stable/c/1f800f6aae57d2d8f63d32fff383017cbc11cf65" }, { "url": "https://git.kernel.org/stable/c/ccf1ccdc5926907befbe880b562b2a4b5f44c087" }, { "url": "https://git.kernel.org/stable/c/f3221361dc85d4de22586ce8441ec2c67b454f5d" } ], "title": "net: tls: avoid hanging tasks on the tx_lock", "x_generator": { "engine": "bippy-1.2.0" } } } }