316 lines
19 KiB
JSON
316 lines
19 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2024-44946",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2024-08-21T05:34:56.665Z",
|
|
"datePublished": "2024-08-31T13:22:47.250Z",
|
|
"dateUpdated": "2026-08-05T11:37:13.816Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-08-05T11:37:13.816Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkcm: Serialise kcm_sendmsg() for the same socket.\n\nsyzkaller reported UAF in kcm_release(). [0]\n\nThe scenario is\n\n 1. Thread A builds a skb with MSG_MORE and sets kcm->seq_skb.\n\n 2. Thread A resumes building skb from kcm->seq_skb but is blocked\n by sk_stream_wait_memory()\n\n 3. Thread B calls sendmsg() concurrently, finishes building kcm->seq_skb\n and puts the skb to the write queue\n\n 4. Thread A faces an error and finally frees skb that is already in the\n write queue\n\n 5. kcm_release() does double-free the skb in the write queue\n\nWhen a thread is building a MSG_MORE skb, another thread must not touch it.\n\nLet's add a per-sk mutex and serialise kcm_sendmsg().\n\n[0]:\nBUG: KASAN: slab-use-after-free in __skb_unlink include/linux/skbuff.h:2366 [inline]\nBUG: KASAN: slab-use-after-free in __skb_dequeue include/linux/skbuff.h:2385 [inline]\nBUG: KASAN: slab-use-after-free in __skb_queue_purge_reason include/linux/skbuff.h:3175 [inline]\nBUG: KASAN: slab-use-after-free in __skb_queue_purge include/linux/skbuff.h:3181 [inline]\nBUG: KASAN: slab-use-after-free in kcm_release+0x170/0x4c8 net/kcm/kcmsock.c:1691\nRead of size 8 at addr ffff0000ced0fc80 by task syz-executor329/6167\n\nCPU: 1 PID: 6167 Comm: syz-executor329 Tainted: G B 6.8.0-rc5-syzkaller-g9abbc24128bc #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nCall trace:\n dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291\n show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x178/0x518 mm/kasan/report.c:488\n kasan_report+0xd8/0x138 mm/kasan/report.c:601\n __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381\n __skb_unlink include/linux/skbuff.h:2366 [inline]\n __skb_dequeue include/linux/skbuff.h:2385 [inline]\n __skb_queue_purge_reason include/linux/skbuff.h:3175 [inline]\n __skb_queue_purge include/linux/skbuff.h:3181 [inline]\n kcm_release+0x170/0x4c8 net/kcm/kcmsock.c:1691\n __sock_release net/socket.c:659 [inline]\n sock_close+0xa4/0x1e8 net/socket.c:1421\n __fput+0x30c/0x738 fs/file_table.c:376\n ____fput+0x20/0x30 fs/file_table.c:404\n task_work_run+0x230/0x2e0 kernel/task_work.c:180\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0x618/0x1f64 kernel/exit.c:871\n do_group_exit+0x194/0x22c kernel/exit.c:1020\n get_signal+0x1500/0x15ec kernel/signal.c:2893\n do_signal+0x23c/0x3b44 arch/arm64/kernel/signal.c:1249\n do_notify_resume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148\n exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]\n exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]\n el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713\n el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730\n el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\n\nAllocated by task 6166:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x40/0x78 mm/kasan/common.c:68\n kasan_save_alloc_info+0x70/0x84 mm/kasan/generic.c:626\n unpoison_slab_object mm/kasan/common.c:314 [inline]\n __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:340\n kasan_slab_alloc include/linux/kasan.h:201 [inline]\n slab_post_alloc_hook mm/slub.c:3813 [inline]\n slab_alloc_node mm/slub.c:3860 [inline]\n kmem_cache_alloc_node+0x204/0x4c0 mm/slub.c:3903\n __alloc_skb+0x19c/0x3d8 net/core/skbuff.c:641\n alloc_skb include/linux/skbuff.h:1296 [inline]\n kcm_sendmsg+0x1d3c/0x2124 net/kcm/kcmsock.c:783\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg net/socket.c:745 [inline]\n sock_sendmsg+0x220/0x2c0 net/socket.c:768\n splice_to_socket+0x7cc/0xd58 fs/splice.c:889\n do_splice_from fs/splice.c:941 [inline]\n direct_splice_actor+0xec/0x1d8 fs/splice.c:1164\n splice_direct_to_actor+0x438/0xa0c fs/splice.c:1108\n do_splice_direct_actor \n---truncated---"
|
|
}
|
|
],
|
|
"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 code is reached only through local `sendmsg(2)`/`sendfile(2)`/`splice(2)` syscalls on an AF_KCM socket the attacker opened; a remote peer cannot drive `kcm_sendmsg()`. Local code execution on the system is required.\nAC:L - The attacker controls both sides of the race (two threads on one fd it owns) and controls the blocking window itself by shrinking `SO_SNDBUF` so `sk_stream_wait_memory()` reliably blocks with the sock lock dropped; syzbot reproduced it and confirmed the fix.\nPR:L - `kcm_create()` performs no `capable()`/`ns_capable()` check and `__sock_create()` autoloads `net-pf-41` without a capability gate, so any unprivileged local user can open a PF_KCM socket; no psock attach or CAP_NET_ADMIN is needed since the corrupted skb is purged at `kcm_release()`.\nUI:N - The attacker's own two threads perform every step — create the socket, race the sendmsg calls, and close the fd. No victim action is involved.\nS:U - The use-after-free and double free are confined to kernel heap within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A freed `skbuff_head_cache` object stays linked in `sk_write_queue`, so its reclaimed contents are read back and, with an attached psock, `kcm_write_msgs()` can transmit the freed skb's frags to the peer — leaking kernel heap; a UAF of this shape is a general arbitrary-read primitive.\nI:H - `__skb_unlink()` on the freed skb writes through attacker-reclaimable `next`/`prev` pointers (`next->prev = prev; prev->next = next`), yielding a write-what-where primitive, compounded by a genuine double free of the skb — both are exploitable for control-flow hijack and privilege escalation.\nA:H - The reported KASAN slab-use-after-free in `kcm_release()` plus the double free corrupt the skb list and slab freelist, causing kernel oops/panic; any unprivileged user can trigger this repeatedly."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"include/net/kcm.h",
|
|
"net/kcm/kcmsock.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
|
|
"lessThan": "8c9cdbf600143bd6835c8b8351e5ac956da79aec",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
|
|
"lessThan": "6633b17840bf828921254d788ccd15602843fe9b",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
|
|
"lessThan": "eb06c8d3022ce6738711191c89f9b3e9cfb91914",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
|
|
"lessThan": "fa6c23fe6dcac8c8bd63920ee8681292a2bd544e",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
|
|
"lessThan": "72da240aafb142630cf16adc803ccdacb3780849",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
|
|
"lessThan": "00425508f30baa5ab6449a1f478480ca7cffa6da",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
|
|
"lessThan": "9c8d544ed619f704e2b70e63e08ab75630c2ea23",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "ab7ac4eb9832e32a09f4e8042705484d2fb0aad3",
|
|
"lessThan": "807067bf014d4a3ae2cc55bd3de16f22a01eb580",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "affected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"include/net/kcm.h",
|
|
"net/kcm/kcmsock.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "4.6",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "4.6",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "4.19.321",
|
|
"lessThanOrEqual": "4.19.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.4.283",
|
|
"lessThanOrEqual": "5.4.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.10.225",
|
|
"lessThanOrEqual": "5.10.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.15.166",
|
|
"lessThanOrEqual": "5.15.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.1.107",
|
|
"lessThanOrEqual": "6.1.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.6.48",
|
|
"lessThanOrEqual": "6.6.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.10.7",
|
|
"lessThanOrEqual": "6.10.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.11",
|
|
"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": "4.6",
|
|
"versionEndExcluding": "4.19.321"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.6",
|
|
"versionEndExcluding": "5.4.283"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.6",
|
|
"versionEndExcluding": "5.10.225"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.6",
|
|
"versionEndExcluding": "5.15.166"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.6",
|
|
"versionEndExcluding": "6.1.107"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.6",
|
|
"versionEndExcluding": "6.6.48"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.6",
|
|
"versionEndExcluding": "6.10.7"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "4.6",
|
|
"versionEndExcluding": "6.11"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/8c9cdbf600143bd6835c8b8351e5ac956da79aec"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/6633b17840bf828921254d788ccd15602843fe9b"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/eb06c8d3022ce6738711191c89f9b3e9cfb91914"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/fa6c23fe6dcac8c8bd63920ee8681292a2bd544e"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/72da240aafb142630cf16adc803ccdacb3780849"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/00425508f30baa5ab6449a1f478480ca7cffa6da"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/9c8d544ed619f704e2b70e63e08ab75630c2ea23"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/807067bf014d4a3ae2cc55bd3de16f22a01eb580"
|
|
}
|
|
],
|
|
"title": "kcm: Serialise kcm_sendmsg() for the same socket.",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"id": "CVE-2024-44946",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "partial"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2024-09-10T15:27:06.483265Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2024-09-12T17:33:16.399Z"
|
|
}
|
|
},
|
|
{
|
|
"title": "CVE Program Container",
|
|
"references": [
|
|
{
|
|
"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
|
|
},
|
|
{
|
|
"url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
|
|
}
|
|
],
|
|
"providerMetadata": {
|
|
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
|
|
"shortName": "CVE",
|
|
"dateUpdated": "2025-11-03T22:13:51.524Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |