CVE-2025-38700: Linux kernel · scsi: libiscsi: Initialize iscsi_conn->dd_data only if memory is allocated
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in fd5aad080edb501ab5c84b7623d612d0e3033403 : update Linux kernel when convenient.
Data as of 5 Nov 2026, 21:34 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-05.
- Patch
- Available – fixed in fd5aad080edb501ab5c84b7623d612d0e3033403, f53af99f441ee79599d8df6113a7144d74cf9153, a145c269dc5380c063a20a0db7e6df2995962e9d +6
Exploitation evidence
Disclosed: evidence found.
CVE published 4 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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
References
- git.kernel.org/stable/c/f53af99f441ee79599d8df6113a7144d74cf9153 (opens in a new tab)
- git.kernel.org/stable/c/9ea6d961566c7d762ed0204b06db05756fdda3b6 (opens in a new tab)
- git.kernel.org/stable/c/fd5aad080edb501ab5c84b7623d612d0e3033403 (opens in a new tab)
- git.kernel.org/stable/c/a145c269dc5380c063a20a0db7e6df2995962e9d (opens in a new tab)
- git.kernel.org/stable/c/66a373f50b4249d57f5a88c7be9676f9d5884865 (opens in a new tab)
- git.kernel.org/stable/c/35782c32528d82aa21f84cb5ceb2abd3526a8159 (opens in a new tab)
- git.kernel.org/stable/c/a33d42b7fc24fe03f239fbb0880dd5b4b4b97c19 (opens in a new tab)
- git.kernel.org/stable/c/2b242ea14386a510010eabfbfc3ce81a101f3802 (opens in a new tab)
- git.kernel.org/stable/c/3ea3a256ed81f95ab0f3281a0e234b01a9cae605 (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/10/msg00008.html (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/10/msg00007.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-032379.html (opens in a new tab)