{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-56694", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-27T15:00:39.849Z", "datePublished": "2024-12-28T09:46:18.826Z", "dateUpdated": "2026-08-05T11:46:08.180Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:46:08.180Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix recursive lock when verdict program return SK_PASS\n\nWhen the stream_verdict program returns SK_PASS, it places the received skb\ninto its own receive queue, but a recursive lock eventually occurs, leading\nto an operating system deadlock. This issue has been present since v6.9.\n\n'''\nsk_psock_strp_data_ready\n write_lock_bh(&sk->sk_callback_lock)\n strp_data_ready\n strp_read_sock\n read_sock -> tcp_read_sock\n strp_recv\n cb.rcv_msg -> sk_psock_strp_read\n # now stream_verdict return SK_PASS without peer sock assign\n __SK_PASS = sk_psock_map_verd(SK_PASS, NULL)\n sk_psock_verdict_apply\n sk_psock_skb_ingress_self\n sk_psock_skb_ingress_enqueue\n sk_psock_data_ready\n read_lock_bh(&sk->sk_callback_lock) <= dead lock\n\n'''\n\nThis topic has been discussed before, but it has not been fixed.\nPrevious discussion:\nhttps://lore.kernel.org/all/6684a5864ec86_403d20898@john.notmuch" } ], "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 deadlock is triggered by inbound TCP data arriving on a sockmap-managed socket, driven from softirq packet-receive context (`tcp_data_queue` → `sk_data_ready` → `sk_psock_strp_data_ready`). On a host running a sockmap/sk_skb-accelerated proxy or load balancer, a remote peer sending a message that the verdict program passes is sufficient.\nAC:L - In an affected configuration the deadlock is deterministic — every `SK_PASS` return without a redirect peer re-enters `sk_callback_lock` — with no race to win, no memory-layout requirement, and no state the attacker cannot induce by simply sending data.\nPR:N - The remote peer needs no credentials on the target: the sockmap parser/verdict programs run on data as soon as it lands in the socket's receive path, before any application-level authentication, so an unauthenticated client connecting to the service triggers it.\nUI:N - No victim action is needed; sending data on an established TCP connection is enough, and the kernel processes it asynchronously in softirq.\nS:U - The hang is confined to the kernel of the affected host — the same security authority as the vulnerable component — with no crossing of a VM, IOMMU, or sandbox boundary.\nC:N - The flaw is recursive acquisition of an rwlock; no memory is read out of bounds, no object is used after free, and no kernel data is disclosed to the attacker.\nI:N - No memory corruption, no out-of-bounds or arbitrary write, and no control-flow influence — the only consequence is that the lock is never released.\nA:H - The CPU spins forever inside `read_lock_bh()` with softirqs and preemption disabled while holding `sk_callback_lock` for write, wedging that CPU (hard lockup / RCU stall) and blocking all other CPUs touching the socket — a full operating-system deadlock as described in the commit." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/core/skmsg.c" ], "versions": [ { "version": "c0809c128dad4c3413818384eb06a341633db973", "lessThan": "221109ba2127eabd0aa64718543638b58b15df56", "status": "affected", "versionType": "git" }, { "version": "5965bc7535fb87510b724e5465ccc1a1cf00916d", "lessThan": "6694f7acd625ed854bf6342926e771d65dad7f69", "status": "affected", "versionType": "git" }, { "version": "39dc9e1442385d6e9be0b6491ee488dddd55ae27", "lessThan": "386efa339e08563dd33e83bc951aea5d407fe578", "status": "affected", "versionType": "git" }, { "version": "b397a0ab8582c533ec0c6b732392f141fc364f87", "lessThan": "da2bc8a0c8f3ac66fdf980fc59936f851a083561", "status": "affected", "versionType": "git" }, { "version": "6648e613226e18897231ab5e42ffc29e63fa3365", "lessThan": "01f1b88acfd79103da0610b45471f6c88ea98d72", "status": "affected", "versionType": "git" }, { "version": "6648e613226e18897231ab5e42ffc29e63fa3365", "lessThan": "f84c5ef6ca23cc2f72f3b830d74f67944684bb05", "status": "affected", "versionType": "git" }, { "version": "6648e613226e18897231ab5e42ffc29e63fa3365", "lessThan": "8ca2a1eeadf09862190b2810697702d803ceef2d", "status": "affected", "versionType": "git" }, { "version": "772d5729b5ff0df0d37b32db600ce635b2172f80", "status": "affected", "versionType": "git" }, { "version": "5.10.223", "lessThan": "5.10.233", "status": "affected", "versionType": "semver" }, { "version": "5.15.159", "lessThan": "5.15.174", "status": "affected", "versionType": "semver" }, { "version": "6.1.91", "lessThan": "6.1.120", "status": "affected", "versionType": "semver" }, { "version": "6.6.31", "lessThan": "6.6.64", "status": "affected", "versionType": "semver" }, { "version": "6.8.10", "lessThan": "6.9", "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/core/skmsg.c" ], "versions": [ { "version": "6.9", "status": "affected" }, { "version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.233", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.174", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.120", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.64", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.11", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.2", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13", "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": "5.10.223", "versionEndExcluding": "5.10.233" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.159", "versionEndExcluding": "5.15.174" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.91", "versionEndExcluding": "6.1.120" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.31", "versionEndExcluding": "6.6.64" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.11.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.12.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/221109ba2127eabd0aa64718543638b58b15df56" }, { "url": "https://git.kernel.org/stable/c/6694f7acd625ed854bf6342926e771d65dad7f69" }, { "url": "https://git.kernel.org/stable/c/386efa339e08563dd33e83bc951aea5d407fe578" }, { "url": "https://git.kernel.org/stable/c/da2bc8a0c8f3ac66fdf980fc59936f851a083561" }, { "url": "https://git.kernel.org/stable/c/01f1b88acfd79103da0610b45471f6c88ea98d72" }, { "url": "https://git.kernel.org/stable/c/f84c5ef6ca23cc2f72f3b830d74f67944684bb05" }, { "url": "https://git.kernel.org/stable/c/8ca2a1eeadf09862190b2810697702d803ceef2d" } ], "title": "bpf: fix recursive lock when verdict program return SK_PASS", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:52:43.997Z" } } ] } }