CVE-2022-50459
scsi: iscsi: iscsi_tcp: Fix null-ptr-deref while calling getpeername()
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: scsi: iscsi: iscsi_tcp: Fix null-ptr-deref while calling getpeername() Fix a NULL pointer crash that occurs when we are freeing the socket at the same time we access it via sysfs. The problem is that: 1. iscsi_sw_tcp_conn_get_param() and iscsi_sw_tcp_host_get_param() take the frwd_lock and do sock_hold() then drop the frwd_lock. sock_hold() does a get on the "struct sock". 2. iscsi_sw_tcp_release_conn() does sockfd_put() which does the last put on the "struct socket" and that does __sock_release() which sets the sock->ops to NULL. 3. iscsi_sw_tcp_conn_get_param() and iscsi_sw_tcp_host_get_param() then call kernel_getpeername() which accesses the NULL sock->ops. Above we do a get on the "struct sock", but we needed a get on the "struct socket". Originally, we just held the frwd_lock the entire time but in commit bcf3a2953d36 ("scsi: iscsi: iscsi_tcp: Avoid holding spinlock while calling getpeername()") we switched to refcount based because the network layer changed and started taking a mutex in that path, so we could no longer hold the frwd_lock. Instead of trying to maintain multiple refcounts, this just has us use a mutex for accessing the socket in the interface code paths.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
- affected bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 – < 884a788f065578bb640382279a83d1df433b13e6
- affected bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 – < a26b0658751bb0a3b28386fca715333b104d32a2
- affected bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 – < 897dbbc57d71e8a34ec1af8e573a142de457da38
- affected bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 – < 0a0b861fce2657ba08ec356a74346b37ca4b2008
- affected bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 – < 57569c37f0add1b6489e1a1563c71519daf732cf
- affected 7d29e950766327f658cb92722b9445ac3b3ae023
- affected 5.8.14 – < 5.9
- affected 5.9
- unaffected < 5.9
- unaffected 5.10.150 – ≤ 5.10.*
- unaffected 5.15.75 – ≤ 5.15.*
- unaffected 5.19.17 – ≤ 5.19.*
- unaffected 6.0.3 – ≤ 6.0.*
- unaffected 6.1 – ≤ *
References (5)
- https://git.kernel.org/stable/c/884a788f065578bb640382279a83d1df433b13e6 (opens in a new tab)
- https://git.kernel.org/stable/c/a26b0658751bb0a3b28386fca715333b104d32a2 (opens in a new tab)
- https://git.kernel.org/stable/c/897dbbc57d71e8a34ec1af8e573a142de457da38 (opens in a new tab)
- https://git.kernel.org/stable/c/0a0b861fce2657ba08ec356a74346b37ca4b2008 (opens in a new tab)
- https://git.kernel.org/stable/c/57569c37f0add1b6489e1a1563c71519daf732cf (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2022-50459)Record last updated .