{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-56605", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-27T14:03:06.013Z", "datePublished": "2024-12-27T14:51:10.344Z", "dateUpdated": "2026-08-05T11:45:26.035Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:45:26.035Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: do not leave dangling sk pointer on error in l2cap_sock_create()\n\nbt_sock_alloc() allocates the sk object and attaches it to the provided\nsock object. On error l2cap_sock_alloc() frees the sk object, but the\ndangling pointer is still attached to the sock object, which may create\nuse-after-free in other code." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable path is entered only from the local `socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP)` syscall via `__sock_create()` → `bt_sock_create()` → `l2cap_sock_create()`; no remote or adjacent Bluetooth peer data is involved, since the inbound-connection caller `l2cap_sock_new_connection_cb()` passes `sock == NULL` and never sets a dangling pointer.\nAC:L - The sole precondition is failure of `kzalloc(sizeof(*chan), GFP_ATOMIC)` in `l2cap_chan_create()`, and the attacker controls both sides — driving system memory pressure with their own allocations (GFP_ATOMIC has no reclaim fallback and fails readily under pressure) while looping on `socket()` from many threads, retrying indefinitely at no cost. No race the attacker cannot influence and no unpredictable memory layout is required.\nPR:L - `l2cap_sock_create()` imposes no capability check for SOCK_SEQPACKET/SOCK_STREAM/SOCK_DGRAM — `CAP_NET_RAW` gates only SOCK_RAW and `CAP_NET_BIND_SERVICE` applies later at `bind()` — so any unprivileged local user on a Bluetooth-enabled system can reach the allocation failure path.\nUI:N - The attacker triggers the entire sequence themselves with a single syscall under self-induced memory pressure; no victim must open a file, pair a device, or take any other action.\nS:U - The freed `struct sock`, the stale `sock->sk` reference, and every downstream effect remain within the kernel's own security authority — no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - `sock->sk` is left pointing at slab memory freed by `sk_free()`, and `__sock_create()`'s error path skips the `sock->sk = NULL` clearing in `__sock_release()` (it sits inside the `if (ops)` block after `sock->ops = NULL`), so any subsequent dereference reads freed memory — as KASAN-confirmed in the parent fix, `__sock_gen_cookie()` performs an 8-byte read of the dead object, and the attacker can reclaim that `l2cap_pinfo`-sized slab object by heap spray to control and disclose its contents.\nI:H - The same dangling pointer yields a write primitive, not just a read: `__sock_gen_cookie()` issues `atomic64_cmpxchg(&sk->sk_cookie, ...)` into the freed object at a fixed offset, corrupting whatever attacker-groomed structure has reclaimed that slot — a classic use-after-free write usable for control-flow hijacking.\nA:H - Use of the freed `struct sock` corrupts the slab allocator and produces oops or panic even when not weaponized; additionally the `DEBUG_NET_WARN_ONCE(sock->sk, ...)` added to `__sock_create()` for exactly this bug class fires on CONFIG_DEBUG_NET kernels, which is fatal under `panic_on_warn`." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/l2cap_sock.c" ], "versions": [ { "version": "49dfbb9129c4edb318578de35cc45c555df37884", "lessThan": "f6ad641646b67f29c7578dcd6c25813c7dcbf51e", "status": "affected", "versionType": "git" }, { "version": "49dfbb9129c4edb318578de35cc45c555df37884", "lessThan": "daa13175a6dea312a76099066cb4cbd4fc959a84", "status": "affected", "versionType": "git" }, { "version": "49dfbb9129c4edb318578de35cc45c555df37884", "lessThan": "a8677028dd5123e5e525b8195483994d87123de4", "status": "affected", "versionType": "git" }, { "version": "49dfbb9129c4edb318578de35cc45c555df37884", "lessThan": "bb2f2342a6ddf7c04f9aefbbfe86104cd138e629", "status": "affected", "versionType": "git" }, { "version": "49dfbb9129c4edb318578de35cc45c555df37884", "lessThan": "8ad09ddc63ace3950ac43db6fbfe25b40f589dd6", "status": "affected", "versionType": "git" }, { "version": "49dfbb9129c4edb318578de35cc45c555df37884", "lessThan": "61686abc2f3c2c67822aa23ce6f160467ec83d35", "status": "affected", "versionType": "git" }, { "version": "49dfbb9129c4edb318578de35cc45c555df37884", "lessThan": "7c4f78cdb8e7501e9f92d291a7d956591bf73be9", "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/bluetooth/l2cap_sock.c" ], "versions": [ { "version": "3.6", "status": "affected" }, { "version": "0", "lessThan": "3.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.287", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.231", "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": "6.6.66", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.5", "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": "3.6", "versionEndExcluding": "5.4.287" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "5.10.231" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "5.15.174" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "6.1.120" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "6.6.66" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "6.12.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.6", "versionEndExcluding": "6.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f6ad641646b67f29c7578dcd6c25813c7dcbf51e" }, { "url": "https://git.kernel.org/stable/c/daa13175a6dea312a76099066cb4cbd4fc959a84" }, { "url": "https://git.kernel.org/stable/c/a8677028dd5123e5e525b8195483994d87123de4" }, { "url": "https://git.kernel.org/stable/c/bb2f2342a6ddf7c04f9aefbbfe86104cd138e629" }, { "url": "https://git.kernel.org/stable/c/8ad09ddc63ace3950ac43db6fbfe25b40f589dd6" }, { "url": "https://git.kernel.org/stable/c/61686abc2f3c2c67822aa23ce6f160467ec83d35" }, { "url": "https://git.kernel.org/stable/c/7c4f78cdb8e7501e9f92d291a7d956591bf73be9" } ], "title": "Bluetooth: L2CAP: do not leave dangling sk pointer on error in l2cap_sock_create()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-56605", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-02-11T15:42:08.177341Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-11T15:45:22.950Z" } }, { "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": "2025-11-03T20:50:51.126Z" } } ] } }