CVE-2025-38700: debian debian_linux NULL Pointer Dereference
Vulnerability summary
CVE-2025-38700 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in debian debian_linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.6% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 46 · Related 41Timeline
- 04-09-2025PublishedVulnerability first disclosed.
- 12-05-2026Last modifiedVulnerability information updated.
Description
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
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.18%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
+0.01 pp
From 0.17% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu149 products
- linuxAll versions (No fix recorded) | < 5.15.0-163.173 | < 6.8.0-100.100
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1097.104 | < 6.8.0-1046.49
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.153-1 | < 6.12.43-1 | < 6.16.3-1
- debian_linuxEOL11.0
Linux2 products
- linux≥ 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187, < f53af99f441ee79599d8df6113a7144d74cf9153 | ≥ 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187, < 9ea6d961566c7d762ed0204b06db05756fdda3b6 | ≥ 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187, < fd5aad080edb501ab5c84b7623d612d0e3033403 | ≥ 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187, < a145c269dc5380c063a20a0db7e6df2995962e9d | ≥ 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187, < 66a373f50b4249d57f5a88c7be9676f9d5884865 | ≥ 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187, < 35782c32528d82aa21f84cb5ceb2abd3526a8159 | ≥ 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187, < a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19 | ≥ 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187, < 2b242ea14386a510010eabfbfc3ce81a101f3802 | ≥ 5d91e209fb21fb9cc765729d4c6a85a9fb6c9187, < 3ea3a256ed81f95ab0f3281a0e234b01a9cae605 | 2.6.27
- linux_kernel≥ 2.6.27, < 5.4.297 | ≥ 5.5, < 5.10.241 | ≥ 5.11, < 5.15.190 | ≥ 5.16, < 6.1.149 | ≥ 6.2, < 6.6.103 | ≥ 6.7, < 6.12.43 | ≥ 6.13, < 6.15.11 | ≥ 6.16, < 6.16.2
3 vendors · 153 products
