CVE-2026-53254: linux Out-of-bounds Read
Vulnerability summary
CVE-2026-53254 is a high (CVSS 8.1) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 18.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 42 · Related 38Timeline
- 25-06-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: validate skb length in MCC handlers The RFCOMM MCC handlers cast skb->data to protocol-specific structs without validating skb->len first. A malicious remote device can send truncated MCC frames and trigger out-of-bounds reads in these handlers. Fix this by using skb_pull_data() to validate and access the required data before dereferencing it. rfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows 1-byte RPN requests. Handle this by validating only the DLCI byte first, and validating the full struct only when len > 1.
CVSS metrics
6 scores · 5 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated8.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated8.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated8.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- NVDNIST8.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
0.27%
Chance of exploitation in the next 30 days
Percentile
19%
Versus all other CVEs
30-day change
+0.01 pp
From 0.27% 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 causeAffected systems
Ubuntu168 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-146.146 | < 7.0.0-31.31
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1066.69 | < 7.0.0-1012.12
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Chainguard6 products
- linux-azure-6.18< 6.18.38-r0
- linux-gcp-6.18< 6.18.38-r0
- linux-gcp-6.18-bootc-boot-installed< 6.18.38-r0
- linux-qemu-6.18< 6.18.38-r0
- linux-qemu-6.18-bootc-boot-installed< 6.18.38-r0
Linux2 products
- linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7c15c7c2878957cbfed93bcc29c13fdace464254 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 0d637136ce89f9a2309b2c3502402ce400dab0ef | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 98377e6b1a1a56561ec66a181573ea2b61b2079e | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 3eabc6d47a0ad22b053329997aaf0ec1e581e392 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 23882b828c3c8c51d0c946446a396b10abb3b16b | 2.6.12
- linux_kernel≥ 2.6.12.1, < 5.15.210 | ≥ 5.16, < 6.1.176 | ≥ 6.2, < 6.6.143 | ≥ 6.7, < 6.12.94 | ≥ 6.13, < 6.18.36 | ≥ 6.19, < 7.0.13 | 2.6.12 | 2.6.12:rc2 | 2.6.12:rc3 | 2.6.12:rc4 | 2.6.12:rc5 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4 | 7.1:rc5 | 7.1:rc6
Debian1 product
- linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.13-1
4 vendors · 177 products
