CVE-2026-63975: linux Use After Free
Vulnerability summary
CVE-2026-63975 is a high (CVSS 8.8) Use After Free vulnerability in linux. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 27.6% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 41 · Related 37Timeline
- 19-07-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp If dcid is received for an already-assigned destination CID the spec requires that both channels to be discarded, but calling l2cap_chan_del may invalidate the tmp cursor created by list_for_each_entry_safe and in fact it is the wrong procedure as the chan->dcid may be assigned previously it really needs to be disconnected. Calling l2cap_chan_clone directly may still lead to l2cap_chan_del so instead schedule l2cap_chan_timeout with delay 0 to close the channel asynchronously.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST8.8HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.35%
Chance of exploitation in the next 30 days
Percentile
28%
Versus all other CVEs
30-day change
0.00 pp
From 0.35% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
- CWE-667Improper LockingThe product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.
Affected systems
Ubuntu155 products
- linux< 5.15.0-198.208 | < 6.8.0-146.146 | < 7.0.0-28.28
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.15.0-1117.124 | < 6.8.0-1066.69 | < 7.0.0-1009.9
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 15f02b91056253e8cdc592888f431da0731337b8, < 3c8eaa91eb433c450426539290be4ffe282e9f00 | ≥ 15f02b91056253e8cdc592888f431da0731337b8, < ecfed1e0d8efecad6737a0d83e21d2fd021d8c48 | ≥ 15f02b91056253e8cdc592888f431da0731337b8, < e6833e737a51db1e5ea0401322acf5e22abd8be6 | ≥ 15f02b91056253e8cdc592888f431da0731337b8, < 6319b38fe69f56ed95680ade485b957a53fff642 | ≥ 15f02b91056253e8cdc592888f431da0731337b8, < 291eec1041c918c460dc9702e44edd17794b4a4b | ≥ 15f02b91056253e8cdc592888f431da0731337b8, < 41e29548b5e8b5e5fcf708786b3bea67cab107fa | ≥ 15f02b91056253e8cdc592888f431da0731337b8, < d153b8898c0051eb8b6a083b35cbe304a5886bd5 | ≥ 15f02b91056253e8cdc592888f431da0731337b8, < 41c2713b204e6cb6a94587bc6bf6935107df5479 | 5.7
- linux_kernel≥ 5.7, < 5.10.259 | ≥ 5.11, < 5.15.210 | ≥ 5.16, < 6.1.176 | ≥ 6.2, < 6.6.143 | ≥ 6.7, < 6.12.93 | ≥ 6.13, < 6.18.35 | ≥ 6.19, < 7.0.12 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4 | 7.1:rc5
Debian1 product
- linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1
3 vendors · 158 products
