8.8

CVE-2026-31408: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold

Modified
AliasesUBUNTU-CVE-2026-31408DEBIAN-CVE-2026-31408
Published 06-04-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-31408 is a high (CVSS 8.8) Use After Free vulnerability in linux. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 25.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.8, adjacent network); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.32%
0%100%
Low · -0.08 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 44 · Related 30
MGASA-2026-0108MGASA-2026-0110RHSA-2026:19569RHSA-2026:21556RHSA-2026:21706RHSA-2026:21745

Timeline

  1. 06-04-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold sco_recv_frame() reads conn->sk under sco_conn_lock() but immediately releases the lock without holding a reference to the socket. A concurrent close() can free the socket between the lock release and the subsequent sk->sk_state access, resulting in a use-after-free. Other functions in the same file (sco_sock_timeout(), sco_conn_del()) correctly use sco_sock_hold() to safely hold a reference under the lock. Fix by using sco_sock_hold() to take a reference before releasing the lock, and adding sock_put() on all exit paths.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.32%

Chance of exploitation in the next 30 days

Percentile

25%

Versus all other CVEs

30-day change

Decrease -0.08 pp

From 0.40% 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

Affected systems

Version check

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

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 37e18bc8c9a70d77bd099e2273f328b3bc7f6d0d | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < d57384e27d1ebf0047e3f00a6e1181b8be9857a2 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b0a7da0e3f7442545f071499beb36374714bb9de | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 45aaca995e4a7a05b272a58e7ab2fff4f611b8f1 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 108b81514d8f2535eb16651495cefb2250528db3 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e76e8f0581ef555eacc11dbb095e602fb30a5361 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 598dbba9919c5e36c54fe1709b557d64120cb94b | 2.6.12
  • linux_kernel≥ 2.6.12.1, < 5.15.203 | ≥ 5.16, < 6.1.168 | ≥ 6.2, < 6.6.131 | ≥ 6.7, < 6.12.80 | ≥ 6.13, < 6.18.21 | ≥ 6.19, < 6.19.11 | 2.6.12 | 2.6.12:rc2 | 2.6.12:rc3 | 2.6.12:rc4 | 2.6.12:rc5 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.11-1

3 vendors · 160 products

References

40 links
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