Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: ext4: fix missing brelse() in ext4_xattr_inode_dec_ref_all() The commit c8e008b60492 ("ext4: ignore xattrs past end") introduced a refcount leak in when block_csum is false. ext4_xattr_inode_dec_ref_all() calls ext4_get_inode_loc() to get iloc.bh, but never releases it with brelse().

Affected versions

Linux: 76c365fa7e2a8bb85f0190cdb4b8cdc99b2fdce3 through before dd98a5603a212ea9c96c6982ccdbcc748fdb9a56 (git); f737418b6de31c962c7192777ee4018906975383 through before 153ab2c52355fbebcae622db8e7b506492c73a29 (git); cf9291a3449b04688b81e32621e88de8f4314b54 through before b706d00206a9e82362a9633efbd8b5775650169b (git); 362a90cecd36e8a5c415966d0b75b04a0270e4dd through before 1bc1107a3a403a6d440673ed6666f7b07ef868a8 (git); eb59cc31b6ea076021d14b04e7faab1636b87d0e through before 097227f1ffe1a85bc3c359f81c71e3d40e06e920 (git); c8e008b60492cf6fd31ef127aea6d02fd3d314cd through before 1e6b0a69bf2c9c819255c7566e4355536d81d9cf (git); c8e008b60492cf6fd31ef127aea6d02fd3d314cd through before f072906688933bf47fabbaf63560be03357c8298 (git); c8e008b60492cf6fd31ef127aea6d02fd3d314cd through before 77d059519382bd66283e6a4e83ee186e87e7708f (git); 6aff941cb0f7d0c897c3698ad2e30672709135e3 (git); 3bc6317033f365ce578eb6039445fb66162722fd (git); 836e625b03a666cf93ff5be328c8cb30336db872 (git); 5.10.237 through before 5.10.258 (semver); 5.15.181 through before 5.15.209 (semver); 6.1.135 through before 6.1.175 (semver); 6.6.88 through before 6.6.140 (semver); 6.12.24 through before 6.12.86 (semver); 5.4.293 through before 5.5 (semver); 6.13.12 through before 6.14 (semver); 6.14.3 through before 6.15 (semver); 6.15; V3.1.6 through before * (custom) Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.