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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/edid: fix OOB read in drm_parse_tiled_block()\n\ndrm_parse_tiled_block() casts the DisplayID block to a\nstruct displayid_tiled_block and reads the full fixed layout up to\ntile-\u003etopology_id[7] without checking block-\u003enum_bytes. The DisplayID\niterator only validates the declared payload length, so a crafted EDID\ncan advertise a tiled-display block (tag DATA_BLOCK_TILED_DISPLAY, or\nDATA_BLOCK_2_TILED_DISPLAY_TOPOLOGY for v2.0) with a small num_bytes at\nthe end of a DisplayID extension. The read then runs past the end of the\nexact-sized kmemdup()\u0027d EDID allocation, a heap out-of-bounds read.\n\nReject blocks shorter than the spec\u0027s 22-byte tiled payload before\nreading the fixed struct, as drm_parse_vesa_mso_data() already does.\n\n  BUG: KASAN: slab-out-of-bounds in drm_edid_connector_update\n  Read of size 2 at addr ffff888010077700 by task exploit/147\n   dump_stack_lvl (lib/dump_stack.c:94 ...)\n   print_report (mm/kasan/report.c:378 ...)\n   kasan_report (mm/kasan/report.c:595)\n   drm_edid_connector_update (drivers/gpu/drm/drm_edid.c:7581)\n   bochs_connector_helper_get_modes (drivers/gpu/drm/tiny/bochs.c:574)\n   drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:426)\n   status_store (drivers/gpu/drm/drm_sysfs.c:219)\n   ...\n   vfs_write (fs/read_write.c:595 fs/read_write.c:688)\n   ksys_write (fs/read_write.c:740)"
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              "value": "AV:L - The crafted EDID reaches the parser through a local device node \u2014 an unprivileged DRM client supplying a raw EDID buffer via the exynos vidi `DRM_AUTH` ioctl, or root via the connector\u0027s debugfs `edid_override` plus a sysfs re-probe. No network path exists, and local ioctl delivery is the lowest-friction vector (a physically attached malicious monitor/dock is an additional, equally automatic route).\nAC:L - The attacker fully controls the EDID bytes and only needs to place a tiled-display DisplayID block with a small `num_bytes` at the tail of the last extension block; `drm_edid_valid()` checks nothing but the header and checksums, which the attacker computes. No race and no memory-layout precondition is needed to trigger the read.\nPR:L - Handing an arbitrary EDID to `drm_edid_connector_update()` via `DRM_IOCTL_EXYNOS_VIDI_CONNECTION` requires only an authenticated DRM client (`DRM_AUTH`), i.e. an ordinary logged-in user with access to /dev/dri \u2014 no CAP_SYS_ADMIN and no root.\nUI:N - The attacker drives the connector probe itself through the ioctl, and on the hotplug path the EDID is read and parsed automatically by the kernel. No victim action is involved.\nS:U - The out-of-bounds read stays within the kernel\u0027s own heap and the impact is confined to the kernel security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - Up to ~21 bytes of adjacent slab memory are read past the exact-size EDID allocation, and eight of those bytes are persisted into the connector\u0027s tile fields and handed back to userspace in the TILE property blob via `DRM_IOCTL_MODE_GETPROPBLOB`, giving a repeatable heap-content leak usable to defeat KASLR or recover neighbouring object data.\nI:N - The defect is purely a read; `drm_mode_create_tile_group()` copies the OOB source into a properly sized destination, so no out-of-bounds write or control-flow corruption occurs.\nA:H - The read runs past the end of the slab object and, for exact-fit allocations at a slab boundary, can touch unmapped memory; on KASAN or panic_on_warn kernels it is an immediate fatal report, and the resulting garbage tile geometry is propagated to the modesetting path."
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        },
        {
          "url": "https://git.kernel.org/stable/c/faaa1e1155833e7d4ce7e3cfaf64c0d636b190db"
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      "title": "drm/edid: fix OOB read in drm_parse_tiled_block()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64546",
    "datePublished": "2026-07-27T20:10:37.217Z",
    "dateReserved": "2026-07-19T15:36:31.795Z",
    "dateUpdated": "2026-08-05T12:42:52.793Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: net1080: validate packet_len before pad-byte access in rx_fixup\n\nFor an even packet_len, net1080_rx_fixup() reads the pad byte at\nskb-\u003edata[packet_len] before the skb-\u003elen != packet_len check further\ndown, and packet_len is only bounded against NC_MAX_PACKET. A malicious\nNetChip 1080 device can send a short frame advertising a large even\npacket_len (e.g. 0x4000), so the pad-byte read lands past the end of the\nskb:\n\n  BUG: KASAN: slab-out-of-bounds in net1080_rx_fixup\n  Read of size 1 at addr ffff8880106c83c6 by task ksoftirqd/0/14\n   ...\n   net1080_rx_fixup (drivers/net/usb/net1080.c:384)\n   usbnet_bh (drivers/net/usb/usbnet.c:1589)\n   process_one_work (kernel/workqueue.c:3322)\n   bh_worker (kernel/workqueue.c:3708)\n   tasklet_action (kernel/softirq.c:965)\n   handle_softirqs (kernel/softirq.c:622)\n   ...\n\nReject the frame when packet_len \u003e= skb-\u003elen before reading."
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              "value": "AV:A - net1080 implements a point-to-point Ethernet link over a USB host-to-host cable, so the malformed NC frame originates from the logically adjacent peer host/device on that link rather than from a local user; a compromised peer (or a gadget-mode board presenting 0525:1080, which autoloads the default-y driver) sends the frame over an already-established link with no physical interaction at attack time.\nAC:L - The attacker fully and deterministically controls packet_len and the frame length in every received frame, so the out-of-bounds read is triggered on demand with no race, no timing dependency, and no reliance on memory layout the attacker cannot influence.\nPR:N - The rx path runs in softirq/workqueue context on every received URB with no authentication, no capability check, and no local account on the target; USB/link-level peers are entirely untrusted and ungated.\nUI:N - The driver binds automatically via MODULE_DEVICE_TABLE and processes frames in usbnet_bh without any user action; on an already-connected host-to-host cable the victim does nothing at all.\nS:U - The out-of-bounds read stays within the kernel\u0027s own memory and security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The attacker controls the read offset across a ~32 KB range past a 1523-byte slab/page-frag object, and the comparison outcome is leaked back over the wire because only the matching path reaches nc_ensure_sync()\u0027s vendor control transfer, yielding a repeatable oracle for probing kernel heap contents rather than a bounded few-byte read.\nI:N - The path performs only a one-byte read; the subsequent skb-\u003elen != packet_len check still rejects the frame, and the skb_trim calls on the underflow paths are no-ops, so no kernel memory or network data is modified.\nA:H - The read reaches roughly 31 KB beyond the allocation, which can cross into a KFENCE guard page, an unmapped hole, or a page-frag boundary and oops in softirq context, and on KASAN/panic_on_warn hardened kernels it panics the machine outright \u2014 repeatable per frame."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()\n\nWhen the scatterlist ring is full or nearly full, bpf_msg_push_data()\nenters a copy fallback path and computes copy + len for the page\nallocation size. Since len comes from BPF with arg3_type = ARG_ANYTHING\nand both are u32, a crafted len can wrap the sum to a small value,\ncausing an undersized allocation followed by an out-of-bounds memcpy.\n\n BUG: unable to handle page fault for address: ffffed104089a402\n Oops: Oops: 0000 [#1] SMP KASAN NOPTI\n Call Trace:\n  __asan_memcpy (mm/kasan/shadow.c:105)\n  bpf_msg_push_data (net/core/filter.c:2852 net/core/filter.c:2788)\n  bpf_prog_9ed8b5711920a7d7+0x2e/0x36\n  sk_psock_msg_verdict (net/core/skmsg.c:934)\n  tcp_bpf_sendmsg (net/ipv4/tcp_bpf.c:421 net/ipv4/tcp_bpf.c:584)\n  __sys_sendto (net/socket.c:2206)\n  do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nAdd an overflow check before the allocation."
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          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:L - The vulnerable helper only runs from the sk_msg egress verdict path, reached via a local `sendmsg()`/`sendto()` syscall on a sockmap- or kTLS-attached socket (`tcp_bpf_sendmsg` \u2192 `sk_psock_msg_verdict`, `tls_sw_sendmsg`), as shown in the reported call trace. There is no remote-peer input path into `bpf_msg_push_data()`.\nAC:L - Both trigger conditions are fully attacker-controlled and deterministic: the copy-fallback path is forced by sending \u2265 MAX_SKB_FRAGS*PAGE_SIZE bytes in one sendmsg to fill the SG ring, and the wrapping `len` is a constant chosen by the sk_msg program. No race, timing window, or uncontrolled memory state is involved.\nPR:N - The act that triggers the corruption \u2014 `sendmsg()` on a socket already in the sockmap \u2014 requires no privileges whatsoever, and the same helper\u0027s prior flaw (CVE-2026-63926) was scored PR:N on this basis. `ARG_ANYTHING` means the verifier enforces no bound, so a deployed L7-proxy sk_msg program that derives `len` from message content (e.g. a signed `want - have` underflowing to a huge u32) hands the wrapping value to the kernel without any attacker privilege; where program authorship is needed, CAP_BPF+CAP_NET_ADMIN is delegable to unprivileged container users via a bpffs BPF token.\nUI:N - Exploitation is entirely driven by the attacker\u0027s own socket writes and BPF program; no victim action, mount, or file access is required.\nS:U - The undersized allocation and out-of-bounds write corrupt kernel memory within the same security authority as the vulnerable code. No VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The wild-offset write plus the corrupted `sg.size`/element-length/`data_end` state (huge `len` added to `sg.size` while `sg_set_page()` records the wrapped length) lets adjacent kernel memory be exposed to the BPF program and pushed out on the socket, and the write primitive is readily convertible into an arbitrary kernel read.\nI:H - `memcpy(raw + front + len, from, back)` writes up to a full SG element of attacker-supplied payload roughly 4 GiB past a single-page allocation, with the offset tunable over a ~4 MiB window and the source page groomable \u2014 an attacker-controlled write into the direct map, sufficient for control-flow hijack and privilege escalation.\nA:H - The reported reproducer is an unrecoverable oops (\"unable to handle page fault for address: ffffed104089a402\") when the wild pointer hits unmapped direct-map space, and the ~4 GiB `sk_mem_charge()`/`sg.size` accounting corruption further destabilises the socket and allocator."
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          "url": "https://git.kernel.org/stable/c/dd068ef044128db655f48323a4acfd5907e04903"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qualcomm: rmnet: validate MAP frame length before ingress parsing\n\nWhen ingress deaggregation is disabled, rmnet_map_ingress_handler() passes\nthe skb straight to __rmnet_map_ingress_handler(), skipping the length\nvalidation that rmnet_map_deaggregate() performs on the aggregated path.\nThe parser then dereferences the MAP header and csum header/trailer based on\nthe on-wire pkt_len without checking skb-\u003elen, so a short frame is read out\nof bounds:\n\n  BUG: KASAN: slab-out-of-bounds in rmnet_map_checksum_downlink_packet\n  Read of size 1 at addr ffff88801118ed00 by task exploit/147\n  Call Trace:\n   ...\n   rmnet_map_checksum_downlink_packet (drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c:413)\n   __rmnet_map_ingress_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:96)\n   rmnet_rx_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:129)\n   __netif_receive_skb_core.constprop.0 (net/core/dev.c:6089)\n   netif_receive_skb (net/core/dev.c:6460)\n   tun_get_user (drivers/net/tun.c:1955)\n   tun_chr_write_iter (drivers/net/tun.c:2001)\n   vfs_write (fs/read_write.c:688)\n   ksys_write (fs/read_write.c:740)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n   ...\n\nFactor that validation out of rmnet_map_deaggregate() into\nrmnet_map_validate_packet_len() and run it on the no-aggregation path too.\nThe MAP header is bounds-checked first, since this path can receive a frame\nshorter than the header."
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      "metrics": [
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
            "version": "3.1"
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              "value": "AV:L - The vulnerability is reached by `write()` to a tun fd owned by the attacker, exactly as in the reporter\u0027s KASAN trace (`tun_chr_write_iter` \u2192 `netif_receive_skb` \u2192 `rmnet_rx_handler`), requiring a local account. Although rmnet can be stacked on an Ethernet device (commit 74692caf1b0b), the universally available and demonstrated vector is local.\nAC:L - Every precondition is attacker-chosen \u2014 the `data_format` flags (deaggregation off, CKSUMV4 on) via `IFLA_RMNET_FLAGS`, the frame length, and the `pkt_len`/`pad` fields that select the OOB offset \u2014 with no race, timing, or uncontrolled memory-layout dependency. The trigger is a single deterministic `write()` that can be repeated indefinitely to sweep offsets.\nPR:L - Only an unprivileged local account is needed: `/dev/net/tun` is world-accessible, and both `TUNSETIFF` and `rtnl_newlink` gate on namespace-scoped `ns_capable`/`netlink_net_capable(CAP_NET_ADMIN)`, which `unshare -Urn` grants without real root.\nUI:N - The attacker creates the tun device, the rmnet link, and writes the malformed frame entirely on its own. No victim action or pre-existing configuration is required.\nS:U - The out-of-bounds access and its consequences are confined to kernel memory within the same security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is an attacker-positioned read up to 65535 bytes past a small slab object, and the result is disclosed back to userspace through the unprivileged rmnet ethtool counters \u2014 because the pseudo-header checksum is computed from the attacker\u0027s own IP header, the exact 16-bit heap word at a chosen offset is recoverable in a few probes, yielding a precise heap-read primitive for KASLR bypass and secret disclosure.\nI:L - There is no arbitrary write, but out-of-bounds data determines `skb-\u003eip_summed = CHECKSUM_UNNECESSARY`, causing packets whose checksums were never validated to be accepted by the IP stack as verified. On the MAP-command path `rmnet_map_send_ack()` also writes `cmd-\u003ecmd_type` past the end of a short frame after `skb_trim()` underflows into a no-op.\nA:H - A 64 KB overshoot from a small kmalloc object can land on an unmapped page (guard pages, DEBUG_PAGEALLOC/hardened allocators, memory-region edges), faulting in kernel context and producing an oops; on the real WWAN receive path (ipa/qmi_wwan/mhi_net NAPI) this executes in softirq, where the fault is a panic. KASAN builds abort immediately, as the reporter\u0027s trace shows."
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          "url": "https://git.kernel.org/stable/c/f0f1887a9e30712a1df03e152dce6fb91344b1f3"
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      "title": "net: qualcomm: rmnet: validate MAP frame length before ingress parsing",
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    "cveId": "CVE-2026-64550",
    "datePublished": "2026-07-27T20:10:39.459Z",
    "dateReserved": "2026-07-19T15:36:31.796Z",
    "dateUpdated": "2026-08-05T12:42:56.021Z",
    "state": "PUBLISHED"
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        {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: validate STALE_COOKIE cause length before reading staleness\n\nWhen an ERROR chunk with a STALE_COOKIE cause is received in the\nCOOKIE_ECHOED state, sctp_sf_do_5_2_6_stale() reads the 4-byte Measure\nof Staleness that follows the cause header:\n\n\terr   = (struct sctp_errhdr *)(chunk-\u003eskb-\u003edata);\n\tstale = ntohl(*(__be32 *)((u8 *)err + sizeof(*err)));\n\nerr is the first cause in the chunk, not the STALE_COOKIE cause that\ncaused the dispatch, and nothing guarantees the staleness field is\npresent. sctp_walk_errors() only requires a cause to be as long as the\n4-byte header, so for a STALE_COOKIE cause of length 4 the read runs\npast the cause, and for a minimal ERROR chunk past skb-\u003etail. The value\nis echoed to the peer in the Cookie Preservative of the reply INIT,\nleaking uninitialized memory.\n\nsctp_sf_cookie_echoed_err() already walks to the STALE_COOKIE cause, so\ncheck its length there and pass it to sctp_sf_do_5_2_6_stale(), which\nreads that cause instead of the first one. A STALE_COOKIE cause too\nshort to hold the staleness field is discarded.\n\nThe read is reachable by any peer that can drive an association into\nCOOKIE_ECHOED, including an unprivileged process using a raw SCTP socket\nin a user and network namespace."
        }
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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              "value": "AV:N - The vulnerable code is in the SCTP receive-side state machine and is driven entirely by an attacker-crafted ERROR chunk arriving over the network; no local access is needed. Per kernel guidance, net/ stack bugs reachable via received packets (SCTP explicitly) are Network.\nAC:L - The attacker fully controls the trigger: acting as the SCTP peer it answers INIT with INIT-ACK to place the association in COOKIE_ECHOED, then sends a minimal ERROR chunk with a 4-byte STALE_COOKIE cause as the last chunk in the packet. There is no race, no memory-layout dependency, and the vtag needed is the one the victim itself advertised in its INIT.\nPR:N - SCTP association setup is unauthenticated; the only check is sctp_vtag_verify() against a tag the peer already received in the victim\u0027s INIT. The attacker needs no credentials or privileges on the target system.\nUI:N - No human user action is required \u2014 SCTP client daemons (SIGTRAN, Diameter, cluster transports) establish and retry associations automatically, and an on-path attacker can inject the ERROR into an in-progress handshake. In the local variant an unprivileged process creates both sides itself with no user involved.\nS:U - The out-of-bounds read and the resulting disclosure stay within the kernel\u0027s own security authority; no VM, sandbox, or IOMMU boundary is crossed.\nC:H - Uninitialized kernel memory past skb-\u003etail is read and then transmitted straight back to the attacker inside the reply INIT\u0027s Cookie Preservative parameter, and the attack can be repeated indefinitely to sample recycled network-buffer memory that may contain remnants of other connections\u0027 traffic. This is a remote, unauthenticated, repeatable kernel heap disclosure oracle, matching the C:H treatment given to the sibling SCTP uninit-read CVE-2026-53225.\nI:N - The bug is a pure read; nothing in kernel memory or in the victim\u0027s association state is modified. The only affected value is a protocol field in a packet sent to the attacker itself.\nA:H - The read runs past the end of the received packet data, a memory-safety violation whose target is not proven to remain inside the skb\u0027s allocation across all receive paths (GSO/frag_list segments, UDP-encapsulated and linearized skbs), so it can fault and oops; kernel guidance and the CNA\u0027s scoring of the equivalent SCTP out-of-bounds-read bug both treat this class as A:H."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: fix stale prevhdr pointer in br_ip6_fragment()\n\nbr_ip6_fragment() gets prevhdr, a pointer into the skb head, from\nip6_find_1stfragopt(), then calls skb_checksum_help().  For a cloned skb\nskb_checksum_help() reallocates the head via pskb_expand_head(), leaving\nprevhdr dangling.  It is later dereferenced in ip6_frag_next(), causing a\nuse-after-free write.\n\nSave prevhdr\u0027s offset before skb_checksum_help() and recompute it after,\nlike commit ef0efcd3bd3f (\"ipv6: Fix dangling pointer when ipv6\nfragment\").\n\n  BUG: KASAN: slab-use-after-free in ip6_frag_next (net/ipv6/ip6_output.c:857)\n  Write of size 1 at addr ffff888013ff5016 by task exploit/141\n  Call Trace:\n   ...\n   kasan_report (mm/kasan/report.c:595)\n   ip6_frag_next (net/ipv6/ip6_output.c:857)\n   br_ip6_fragment (net/ipv6/netfilter.c:212)\n   nf_ct_bridge_post (net/bridge/netfilter/nf_conntrack_bridge.c:407)\n   nf_hook_slow (net/netfilter/core.c:619)\n   br_forward_finish (net/bridge/br_forward.c:66)\n   __br_forward (net/bridge/br_forward.c:115)\n   maybe_deliver (net/bridge/br_forward.c:191)\n   br_flood (net/bridge/br_forward.c:245)\n   br_handle_frame_finish (net/bridge/br_input.c:229)\n   br_handle_frame (net/bridge/br_input.c:442)\n   ...\n   packet_sendmsg (net/packet/af_packet.c:3114)\n   ...\n   do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n  Kernel panic - not syncing: Fatal exception in interrupt"
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              "value": "AV:A - The vulnerable code is the bridge forwarding/refragmentation path, driven entirely by frames received on a bridge port from an L2 peer \u2014 typically a guest VM over tap/virtio or a container over veth, which per skbuff.h are exactly the sources that deliver CHECKSUM_PARTIAL skbs on receive. This is logically adjacent topology (bridged segment/overlay), not a routed internet path, so AV:A rather than N.\nAC:L - The attacker controls every precondition: send IPv6 fragments (forces conntrack reassembly and sets frag_max_size), set VIRTIO_NET_HDR_F_NEEDS_CSUM for CHECKSUM_PARTIAL, and target a broadcast/multicast/unknown-unicast MAC so br_flood calls deliver_clone() and makes the skb cloned. No race and no attacker-independent condition is involved; the corruption is deterministic once the packet is crafted.\nPR:N - A guest VM or container attached to the host bridge holds no credentials on the vulnerable host and needs none \u2014 it merely emits frames onto the segment. In the equivalent local variant the entire setup (bridge, veth, nft bridge conntrack, AF_PACKET with CAP_NET_RAW) is reachable from an unprivileged user namespace, so no real privilege is required either way.\nUI:N - The corruption happens automatically in softirq context while the bridge forwards the attacker\u0027s packet. No action by any user or administrator on the target is needed.\nS:U - The vulnerable component and the impacted resource are both the host kernel\u0027s network stack; no hypervisor, IOMMU, or sandbox boundary is bypassed by the bug itself. Standard kernel memory corruption is scored Unchanged.\nC:H - This is a use-after-free/out-of-bounds write on the slab; the freed skb head and the write target can be groomed by the attacker, and such heap corruption is routinely leveraged into arbitrary kernel memory disclosure. Per kernel scoring guidance, UAF/OOB corruption is High confidentiality impact.\nI:H - ip6_frag_next() writes NEXTHDR_FRAGMENT (0x2c) at skb_network_header(frag) plus an uncontrolled inter-allocation delta, giving a repeatable 1-byte heap write at a heap-groomable offset \u2014 once per emitted fragment. A controlled byte write into adjacent slab objects is a classic primitive for corrupting kernel data structures and escalating to control-flow hijack.\nA:H - KASAN reports a slab-use-after-free write followed by \"Kernel panic - not syncing: Fatal exception in interrupt\" because the fault occurs in softirq forwarding context, taking down the whole host rather than one task. The attacker can repeat it at will with a stream of crafted fragments."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb()\n\nl2cap_sock_new_connection_cb() returned l2cap_pi(sk)-\u003echan after\nrelease_sock(parent). Once the parent lock is dropped the newly\nenqueued child socket sk is reachable via the accept queue, so another\ntask can accept and free it before the callback dereferences sk,\nresulting in a use-after-free.\n\nRework the -\u003enew_connection() op so the core, rather than the callback,\nowns the child channel\u0027s lifetime. The op now receives a pre-allocated\nnew_chan and returns an errno instead of allocating and returning a\nchannel. l2cap_new_connection() allocates the child channel and links\nit into the conn list via __l2cap_chan_add() before invoking the\ncallback, so the conn-list reference keeps the channel alive once\nrelease_sock(parent) exposes the socket to other tasks.\n\nChannel configuration that was duplicated in l2cap_sock_init() and the\nvarious new_connection callbacks is consolidated into\nl2cap_chan_set_defaults(), which now inherits from the parent channel\nwhen one is supplied."
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              "value": "AV:A - The vulnerable callback is reached only from L2CAP signalling handlers (`l2cap_connect`, `l2cap_le_connect_req`, `l2cap_ecred_conn_req`, `l2cap_connect_cfm`) processing connection requests received from a remote Bluetooth peer. Bluetooth radio range constitutes an adjacent network.\nAC:L - The attacker drives one side of the race by sending unlimited L2CAP connect requests and can induce the other side, since the local daemon accepts (immediately, for DEFER_SETUP listeners) and closes rejected/unauthorized children; on SMP the accepting task runs truly concurrently while the callback is still inside `release_sock()`, so the window is hit reliably with repeated attempts.\nPR:N - `l2cap_connect()` bypasses the link-mode and encryption-key-size checks entirely for PSM 0x0001 (SDP), where bluetoothd holds a listening L2CAP socket, so an unpaired and unauthenticated remote device can reach `l2cap_sock_new_connection_cb()`; LE CoC and low-security BR/EDR listeners are likewise reachable without credentials.\nUI:N - Incoming L2CAP connection requests are processed automatically by the kernel and accepted by the always-running Bluetooth daemon with no victim action, no pairing prompt, and no user confirmation.\nS:U - The corrupted `l2cap_chan`/`sock` objects and the resulting memory corruption are confined to the kernel\u0027s own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - This is a use-after-free: the freed `l2cap_chan` slab object can be reallocated with attacker-groomed data and its fields are subsequently read back and transmitted to the attacker via the connect response and `l2cap_build_conf_req()`, and `__l2cap_chan_add()` deposits kernel list pointers into the reallocated object, giving a kernel-memory disclosure primitive.\nI:H - After the free, `l2cap_connect()`/`l2cap_le_connect_req()` write attacker-supplied PSM, SCID, MTU/MPS and BD_ADDR values plus list pointers into the freed object, and `__set_chan_timer()` arms delayed work whose function pointers live in that freed memory \u2014 a controlled write primitive suitable for heap spraying and control-flow hijack.\nA:H - Even without successful exploitation, the use-after-free reads and writes into freed slab memory and links a dead object into the conn list, reliably producing kernel oops/panic and corrupted list traversal on subsequent L2CAP operations."
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