CVE-2023-53121
tcp: tcp_make_synack() can be called from process context
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: tcp: tcp_make_synack() can be called from process context tcp_rtx_synack() now could be called in process context as explained in 0a375c822497 ("tcp: tcp_rtx_synack() can be called from process context"). tcp_rtx_synack() might call tcp_make_synack(), which will touch per-CPU variables with preemption enabled. This causes the following BUG: BUG: using __this_cpu_add() in preemptible [00000000] code: ThriftIO1/5464 caller is tcp_make_synack+0x841/0xac0 Call Trace: <TASK> dump_stack_lvl+0x10d/0x1a0 check_preemption_disabled+0x104/0x110 tcp_make_synack+0x841/0xac0 tcp_v6_send_synack+0x5c/0x450 tcp_rtx_synack+0xeb/0x1f0 inet_rtx_syn_ack+0x34/0x60 tcp_check_req+0x3af/0x9e0 tcp_rcv_state_process+0x59b/0x2030 tcp_v6_do_rcv+0x5f5/0x700 release_sock+0x3a/0xf0 tcp_sendmsg+0x33/0x40 ____sys_sendmsg+0x2f2/0x490 __sys_sendmsg+0x184/0x230 do_syscall_64+0x3d/0x90 Avoid calling __TCP_INC_STATS() with will touch per-cpu variables. Use TCP_INC_STATS() which is safe to be called from context switch.
Timeline
ID reserved
By Linux
Published
- 18 months later
· 18 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 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)
- 0.19% · top 91% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 8336886f786fdacbc19b719c1f7ea91eb70706d4 – < d493d4fe88195a144d6a277a90062a7534ed2192
- affected 8336886f786fdacbc19b719c1f7ea91eb70706d4 – < e23ca307745be3df7fe9762f3e2a7e311a57852e
- affected 8336886f786fdacbc19b719c1f7ea91eb70706d4 – < 442aa78ed70188b21ccd8669738448702c0a3281
- affected 8336886f786fdacbc19b719c1f7ea91eb70706d4 – < 77ad58bca0119e8cc3e0e9d91a3f22caa66e4dfa
- affected 8336886f786fdacbc19b719c1f7ea91eb70706d4 – < ad07290d63ff6689f50565b02f5b6f34ec15a5ca
- affected 8336886f786fdacbc19b719c1f7ea91eb70706d4 – < 9180aa4622a720b433e842b4d3aa34d73eec577a
- affected 8336886f786fdacbc19b719c1f7ea91eb70706d4 – < 7613cde8c0c1f02a7ec2e1d536c01b65b135fc1c
- affected 8336886f786fdacbc19b719c1f7ea91eb70706d4 – < bced3f7db95ff2e6ca29dc4d1c9751ab5e736a09
- affected 3.7
- unaffected < 3.7
- unaffected 4.14.311 – ≤ 4.14.*
- unaffected 4.19.279 – ≤ 4.19.*
- unaffected 5.4.238 – ≤ 5.4.*
- unaffected 5.10.176 – ≤ 5.10.*
- unaffected 5.15.104 – ≤ 5.15.*
- unaffected 6.1.21 – ≤ 6.1.*
- unaffected 6.2.8 – ≤ 6.2.*
- unaffected 6.3 – ≤ *
References (8)
- https://git.kernel.org/stable/c/d493d4fe88195a144d6a277a90062a7534ed2192 (opens in a new tab)
- https://git.kernel.org/stable/c/e23ca307745be3df7fe9762f3e2a7e311a57852e (opens in a new tab)
- https://git.kernel.org/stable/c/442aa78ed70188b21ccd8669738448702c0a3281 (opens in a new tab)
- https://git.kernel.org/stable/c/77ad58bca0119e8cc3e0e9d91a3f22caa66e4dfa (opens in a new tab)
- https://git.kernel.org/stable/c/ad07290d63ff6689f50565b02f5b6f34ec15a5ca (opens in a new tab)
- https://git.kernel.org/stable/c/9180aa4622a720b433e842b4d3aa34d73eec577a (opens in a new tab)
- https://git.kernel.org/stable/c/7613cde8c0c1f02a7ec2e1d536c01b65b135fc1c (opens in a new tab)
- https://git.kernel.org/stable/c/bced3f7db95ff2e6ca29dc4d1c9751ab5e736a09 (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)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-53121)Record last updated .