{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74337", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.885Z", "datePublished": "2026-08-15T05:58:28.518Z", "dateUpdated": "2026-08-17T05:17:29.070Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:17:29.070Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix NMI/tracepoint re-entry deadlock on lru locks\n\nNMI and tracepoint BPF programs can re-enter the per-CPU or global\nLRU lock that bpf_lru_pop_free()/push_free() already hold on the\nsame CPU, AA-deadlocking. Lockdep reports \"inconsistent\n{INITIAL USE} -> {IN-NMI}\" on &l->lock (syzbot c69a0a2c816716f1e0d5)\nand \"possible recursive locking detected\" on &loc_l->lock (syzbot\n18b26edb69b2e19f3b33).\n\nPrior trylock and rqspinlock based fixes (see links) were nacked\nbecause compromised on reliability.\n\nThis patch converts every LRU lock site to rqspinlock_t and adds a\nrecovery path for some failure windows to avoid node leaks.\n\nFailure recovery:\n\n - *_pop_free top-level: return NULL; prealloc_lru_pop() already\n treats that as no-free-element (-ENOMEM).\n\n - Cross-CPU steal: skip the victim's locked loc_l, try next CPU.\n\n - Post-steal local lock fail: publish stolen node to lockless\n per-CPU free_llist; next pop on this CPU picks it up.\n\n - push_free fail: mark node pending_free=1. __local_list_flush(),\n __local_list_pop_pending() reclaim the node from pending_list.\n __bpf_lru_list_shrink_inactive() reclaims the node from inactive\n list. Nodes from active list are reclaimed by __bpf_lru_list_shrink()\n or after __bpf_lru_list_rotate_active() demotes it to the inactive."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/bpf_lru_list.c", "kernel/bpf/bpf_lru_list.h"], "versions": [{"version": "3a08c2fd763450a927d1130de078d6f9e74944fb", "lessThan": "8b0510cc3a4a000d4ed1a56cd96231f3d3ba94c5", "status": "affected", "versionType": "git"}, {"version": "3a08c2fd763450a927d1130de078d6f9e74944fb", "lessThan": "440a2fdbb40608d55a7b11f2be53592a3785131d", "status": "affected", "versionType": "git"}, {"version": "3a08c2fd763450a927d1130de078d6f9e74944fb", "lessThan": "89edbdfc5d0308cef57b71359331de5c4ddbf763", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/bpf_lru_list.c", "kernel/bpf/bpf_lru_list.h"], "versions": [{"version": "4.10", "status": "affected"}, {"version": "0", "lessThan": "4.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "4.10", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8b0510cc3a4a000d4ed1a56cd96231f3d3ba94c5"}, {"url": "https://git.kernel.org/stable/c/440a2fdbb40608d55a7b11f2be53592a3785131d"}, {"url": "https://git.kernel.org/stable/c/89edbdfc5d0308cef57b71359331de5c4ddbf763"}], "title": "bpf: Fix NMI/tracepoint re-entry deadlock on lru locks", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/bpf/bpf_lru_list.c", "kernel/bpf/bpf_lru_list.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8b0510cc3a4a000d4ed1a56cd96231f3d3ba94c5", "status": "affected", "version": "3a08c2fd763450a927d1130de078d6f9e74944fb", "versionType": "git"}, {"lessThan": "440a2fdbb40608d55a7b11f2be53592a3785131d", "status": "affected", "version": "3a08c2fd763450a927d1130de078d6f9e74944fb", "versionType": "git"}, {"lessThan": "89edbdfc5d0308cef57b71359331de5c4ddbf763", "status": "affected", "version": "3a08c2fd763450a927d1130de078d6f9e74944fb", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/bpf/bpf_lru_list.c", "kernel/bpf/bpf_lru_list.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.10"}, {"lessThan": "4.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix NMI/tracepoint re-entry deadlock on lru locks\n\nNMI and tracepoint BPF programs can re-enter the per-CPU or global\nLRU lock that bpf_lru_pop_free()/push_free() already hold on the\nsame CPU, AA-deadlocking. Lockdep reports \"inconsistent\n{INITIAL USE} -> {IN-NMI}\" on &l->lock (syzbot c69a0a2c816716f1e0d5)\nand \"possible recursive locking detected\" on &loc_l->lock (syzbot\n18b26edb69b2e19f3b33).\n\nPrior trylock and rqspinlock based fixes (see links) were nacked\nbecause compromised on reliability.\n\nThis patch converts every LRU lock site to rqspinlock_t and adds a\nrecovery path for some failure windows to avoid node leaks.\n\nFailure recovery:\n\n - *_pop_free top-level: return NULL; prealloc_lru_pop() already\n treats that as no-free-element (-ENOMEM).\n\n - Cross-CPU steal: skip the victim's locked loc_l, try next CPU.\n\n - Post-steal local lock fail: publish stolen node to lockless\n per-CPU free_llist; next pop on this CPU picks it up.\n\n - push_free fail: mark node pending_free=1. __local_list_flush(),\n __local_list_pop_pending() reclaim the node from pending_list.\n __bpf_lru_list_shrink_inactive() reclaims the node from inactive\n list. Nodes from active list are reclaimed by __bpf_lru_list_shrink()\n or after __bpf_lru_list_rotate_active() demotes it to the inactive."}], "id": "CVE-2026-74337", "lastModified": "2026-08-17T06:19:28.157", "metrics": {}, "published": "2026-08-15T06:22:34.623", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/440a2fdbb40608d55a7b11f2be53592a3785131d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/89edbdfc5d0308cef57b71359331de5c4ddbf763"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8b0510cc3a4a000d4ed1a56cd96231f3d3ba94c5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: bpf: Fix NMI/tracepoint re-entry deadlock on lru locks", "id": "2516836", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516836"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-833", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Fix NMI/tracepoint re-entry deadlock on lru locks\nNMI and tracepoint BPF programs can re-enter the per-CPU or global\nLRU lock that bpf_lru_pop_free()/push_free() already hold on the\nsame CPU, AA-deadlocking. Lockdep reports \"inconsistent\n{INITIAL USE} -> {IN-NMI}\" on &l->lock (syzbot c69a0a2c816716f1e0d5)\nand \"possible recursive locking detected\" on &loc_l->lock (syzbot\n18b26edb69b2e19f3b33).\nPrior trylock and rqspinlock based fixes (see links) were nacked\nbecause compromised on reliability.\nThis patch converts every LRU lock site to rqspinlock_t and adds a\nrecovery path for some failure windows to avoid node leaks.\nFailure recovery:\n- *_pop_free top-level: return NULL; prealloc_lru_pop() already\ntreats that as no-free-element (-ENOMEM).\n- Cross-CPU steal: skip the victim's locked loc_l, try next CPU.\n- Post-steal local lock fail: publish stolen node to lockless\nper-CPU free_llist; next pop on this CPU picks it up.\n- push_free fail: mark node pending_free=1. __local_list_flush(),\n__local_list_pop_pending() reclaim the node from pending_list.\n__bpf_lru_list_shrink_inactive() reclaims the node from inactive\nlist. Nodes from active list are reclaimed by __bpf_lru_list_shrink()\nor after __bpf_lru_list_rotate_active() demotes it to the inactive.", "A flaw was found in the Linux kernel, specifically within the BPF (Berkeley Packet Filter) subsystem. This vulnerability allows NMI (Non-Maskable Interrupt) and tracepoint BPF programs to re-enter certain internal locks, known as LRU (Least Recently Used) locks, while they are already held. This re-entry creates a deadlock condition, which can cause the system to become unresponsive or hang, leading to a Denial of Service (DoS)."], "name": "CVE-2026-74337", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74337\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74337\nhttps://lore.kernel.org/linux-cve-announce/2026081556-CVE-2026-74337-6b39@gregkh/T"], "threat_severity": "Moderate"}