cvelist/2024/44xxx/CVE-2024-44991.json

124 lines
7.4 KiB
JSON
Raw Normal View History

2024-08-21 06:00:34 +00:00
{
2024-09-04 20:00:35 +00:00
"data_version": "4.0",
2024-08-21 06:00:34 +00:00
"data_type": "CVE",
"data_format": "MITRE",
"CVE_data_meta": {
"ID": "CVE-2024-44991",
2024-09-04 20:00:35 +00:00
"ASSIGNER": "cve@kernel.org",
"STATE": "PUBLIC"
2024-08-21 06:00:34 +00:00
},
"description": {
"description_data": [
{
"lang": "eng",
2024-09-04 20:00:35 +00:00
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: prevent concurrent execution of tcp_sk_exit_batch\n\nIts possible that two threads call tcp_sk_exit_batch() concurrently,\nonce from the cleanup_net workqueue, once from a task that failed to clone\na new netns. In the latter case, error unwinding calls the exit handlers\nin reverse order for the 'failed' netns.\n\ntcp_sk_exit_batch() calls tcp_twsk_purge().\nProblem is that since commit b099ce2602d8 (\"net: Batch inet_twsk_purge\"),\nthis function picks up twsk in any dying netns, not just the one passed\nin via exit_batch list.\n\nThis means that the error unwind of setup_net() can \"steal\" and destroy\ntimewait sockets belonging to the exiting netns.\n\nThis allows the netns exit worker to proceed to call\n\nWARN_ON_ONCE(!refcount_dec_and_test(&net->ipv4.tcp_death_row.tw_refcount));\n\nwithout the expected 1 -> 0 transition, which then splats.\n\nAt same time, error unwind path that is also running inet_twsk_purge()\nwill splat as well:\n\nWARNING: .. at lib/refcount.c:31 refcount_warn_saturate+0x1ed/0x210\n...\n refcount_dec include/linux/refcount.h:351 [inline]\n inet_twsk_kill+0x758/0x9c0 net/ipv4/inet_timewait_sock.c:70\n inet_twsk_deschedule_put net/ipv4/inet_timewait_sock.c:221\n inet_twsk_purge+0x725/0x890 net/ipv4/inet_timewait_sock.c:304\n tcp_sk_exit_batch+0x1c/0x170 net/ipv4/tcp_ipv4.c:3522\n ops_exit_list+0x128/0x180 net/core/net_namespace.c:178\n setup_net+0x714/0xb40 net/core/net_namespace.c:375\n copy_net_ns+0x2f0/0x670 net/core/net_namespace.c:508\n create_new_namespaces+0x3ea/0xb10 kernel/nsproxy.c:110\n\n... because refcount_dec() of tw_refcount unexpectedly dropped to 0.\n\nThis doesn't seem like an actual bug (no tw sockets got lost and I don't\nsee a use-after-free) but as erroneous trigger of debug check.\n\nAdd a mutex to force strict ordering: the task that calls tcp_twsk_purge()\nblocks other task from doing final _dec_and_test before mutex-owner has\nremoved all tw sockets of dying netns."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "n/a"
}
]
2024-08-21 06:00:34 +00:00
}
]
2024-09-04 20:00:35 +00:00
},
"affects": {
"vendor": {
"vendor_data": [
{
"vendor_name": "Linux",
"product": {
"product_data": [
{
"product_name": "Linux",
"version": {
"version_data": [
{
"version_affected": "<",
"version_name": "e9bd0cca09d1",
"version_value": "e3d9de3742f4"
},
{
"version_value": "not down converted",
"x_cve_json_5_version_data": {
"versions": [
{
"version": "6.1",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.1",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.107",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.48",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.10.7",
"lessThanOrEqual": "6.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
2024-09-15 18:03:03 +00:00
"version": "6.11",
2024-09-04 20:00:35 +00:00
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
],
"defaultStatus": "affected"
}
}
]
}
}
]
}
}
]
}
},
"references": {
"reference_data": [
{
"url": "https://git.kernel.org/stable/c/e3d9de3742f4d5c47ae35f888d3023a5b54fcd2f",
"refsource": "MISC",
"name": "https://git.kernel.org/stable/c/e3d9de3742f4d5c47ae35f888d3023a5b54fcd2f"
},
{
"url": "https://git.kernel.org/stable/c/99580ae890ec8bd98b21a2a9c6668f8f1555b62e",
"refsource": "MISC",
"name": "https://git.kernel.org/stable/c/99580ae890ec8bd98b21a2a9c6668f8f1555b62e"
},
{
"url": "https://git.kernel.org/stable/c/f6fd2dbf584a4047ba88d1369ff91c9851261ec1",
"refsource": "MISC",
"name": "https://git.kernel.org/stable/c/f6fd2dbf584a4047ba88d1369ff91c9851261ec1"
},
{
"url": "https://git.kernel.org/stable/c/565d121b69980637f040eb4d84289869cdaabedf",
"refsource": "MISC",
"name": "https://git.kernel.org/stable/c/565d121b69980637f040eb4d84289869cdaabedf"
}
]
},
"generator": {
"engine": "bippy-c9c4e1df01b2"
2024-08-21 06:00:34 +00:00
}
}