ghsa-4vq4-24qf-gq5w
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
scsi: libiscsi: Initialize iscsi_conn->dd_data only if memory is allocated
In case of an ib_fast_reg_mr allocation failure during iSER setup, the machine hits a panic because iscsi_conn->dd_data is initialized unconditionally, even when no memory is allocated (dd_size == 0). This leads invalid pointer dereference during connection teardown.
Fix by setting iscsi_conn->dd_data only if memory is actually allocated.
Panic trace:
iser: iser_create_fastreg_desc: Failed to allocate ib_fast_reg_mr err=-12 iser: iser_alloc_rx_descriptors: failed allocating rx descriptors / data buffers BUG: unable to handle page fault for address: fffffffffffffff8 RIP: 0010:swake_up_locked.part.5+0xa/0x40 Call Trace: complete+0x31/0x40 iscsi_iser_conn_stop+0x88/0xb0 [ib_iser] iscsi_stop_conn+0x66/0xc0 [scsi_transport_iscsi] iscsi_if_stop_conn+0x14a/0x150 [scsi_transport_iscsi] iscsi_if_rx+0x1135/0x1834 [scsi_transport_iscsi] ? netlink_lookup+0x12f/0x1b0 ? netlink_deliver_tap+0x2c/0x200 netlink_unicast+0x1ab/0x280 netlink_sendmsg+0x257/0x4f0 ? _copy_from_user+0x29/0x60 sock_sendmsg+0x5f/0x70
{
"affected": [],
"aliases": [
"CVE-2025-38700"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-04T16:15:38Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libiscsi: Initialize iscsi_conn-\u003edd_data only if memory is allocated\n\nIn case of an ib_fast_reg_mr allocation failure during iSER setup, the\nmachine hits a panic because iscsi_conn-\u003edd_data is initialized\nunconditionally, even when no memory is allocated (dd_size == 0). This\nleads invalid pointer dereference during connection teardown.\n\nFix by setting iscsi_conn-\u003edd_data only if memory is actually allocated.\n\nPanic trace:\n------------\n iser: iser_create_fastreg_desc: Failed to allocate ib_fast_reg_mr err=-12\n iser: iser_alloc_rx_descriptors: failed allocating rx descriptors / data buffers\n BUG: unable to handle page fault for address: fffffffffffffff8\n RIP: 0010:swake_up_locked.part.5+0xa/0x40\n Call Trace:\n complete+0x31/0x40\n iscsi_iser_conn_stop+0x88/0xb0 [ib_iser]\n iscsi_stop_conn+0x66/0xc0 [scsi_transport_iscsi]\n iscsi_if_stop_conn+0x14a/0x150 [scsi_transport_iscsi]\n iscsi_if_rx+0x1135/0x1834 [scsi_transport_iscsi]\n ? netlink_lookup+0x12f/0x1b0\n ? netlink_deliver_tap+0x2c/0x200\n netlink_unicast+0x1ab/0x280\n netlink_sendmsg+0x257/0x4f0\n ? _copy_from_user+0x29/0x60\n sock_sendmsg+0x5f/0x70",
"id": "GHSA-4vq4-24qf-gq5w",
"modified": "2025-09-05T18:31:16Z",
"published": "2025-09-05T18:31:16Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38700"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2b242ea14386a510010eabfbfc3ce81a101f3802"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/35782c32528d82aa21f84cb5ceb2abd3526a8159"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3ea3a256ed81f95ab0f3281a0e234b01a9cae605"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/66a373f50b4249d57f5a88c7be9676f9d5884865"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9ea6d961566c7d762ed0204b06db05756fdda3b6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a145c269dc5380c063a20a0db7e6df2995962e9d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f53af99f441ee79599d8df6113a7144d74cf9153"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fd5aad080edb501ab5c84b7623d612d0e3033403"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.