CVE-2026-68458

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

binder: cache secctx size before release zeroes it

binder_transaction() bounds the scatter-gather buffer area with

sg_buf_end_offset and subtracts the aligned LSM context size because

the secctx is written at the tail of that area. The subtraction reads

lsmctx.len, but that field has already been cleared by the time the

line runs:

security_secid_to_secctx(secid, &lsmctx) /* lsmctx.len set */

lsmctx_aligned_size = ALIGN(lsmctx.len, sizeof(u64))

extra_buffers_size += lsmctx_aligned_size

...

security_release_secctx(&lsmctx) /* memset zeroes len */

...

sg_buf_end_offset = sg_buf_offset + extra_buffers_size

- ALIGN(lsmctx.len, sizeof(u64)) /* ALIGN(0,8) */

security_release_secctx() does memset(cp, 0, sizeof(*cp)), so lsmctx.len

reads back as 0 and the subtraction contributes nothing, leaving

sg_buf_end_offset too large by the aligned secctx size on every

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References