9.8

CVE-2023-54269: SUNRPC: double free xprt_ctxt while still in use

Deferred
AliasesUBUNTU-CVE-2023-54269DEBIAN-CVE-2023-54269
Published 30-12-2025Last modified 15-10-2026

Vulnerability summary

CVE-2023-54269 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 45.9% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.55%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 6 · Related 4
RHSA-2023:6583RHSA-2024:7000SUSE-SU-2026:0263-1SUSE-SU-2026:0317-1SUSE-SU-2026:0411-1SUSE-SU-2026:0617-1

Timeline

  1. 30-12-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: double free xprt_ctxt while still in use When an RPC request is deferred, the rq_xprt_ctxt pointer is moved out of the svc_rqst into the svc_deferred_req. When the deferred request is revisited, the pointer is copied into the new svc_rqst - and also remains in the svc_deferred_req. In the (rare?) case that the request is deferred a second time, the old svc_deferred_req is reused - it still has all the correct content. However in that case the rq_xprt_ctxt pointer is NOT cleared so that when xpo_release_xprt is called, the ctxt is freed (UDP) or possible added to a free list (RDMA). When the deferred request is revisited for a second time, it will reference this ctxt which may be invalid, and the free the object a second time which is likely to oops. So change svc_defer() to *always* clear rq_xprt_ctxt, and assert that the value is now stored in the svc_deferred_req.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.55%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.55% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu109 products
  • linux< 5.15.0-83.92
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1044.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.37-1 | < 6.3.7-1
Linux1 product
  • linux≥ f5e13d700a4d40ccde3d36e383f9247dcb3c1d2d, < 7851771789e87108a92697194105ef0c9307dc5e | ≥ 773f91b2cf3f52df0d7508fdbf60f37567cdaee4, < fd86534872f445f54dc01e7db001e25eadf063a8 | ≥ 773f91b2cf3f52df0d7508fdbf60f37567cdaee4, < e0c648627322a4c7e018e5c7f837c3c03e297dbb | ≥ 773f91b2cf3f52df0d7508fdbf60f37567cdaee4, < eb8d3a2c809abd73ab0a060fe971d6b9019aa3c1 | 11fab500f86403b2ebf6795feeade6e10302e448 | ≥ 5.15.35, < 5.15.113 | ≥ 5.17.4, < 5.18 | 5.18

3 vendors · 111 products

References

8 links