media: rkvdec: hevc: guard INTER_REF_PIC_SET_PRED index underflow
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 7.2.5
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: media: rkvdec: hevc: guard INTER_REF_PIC_SET_PRED index underflow st_ref_pic_set_prediction() computes the reference RPS index as st_rps_idx - (delta_idx_minus1 + 1) per HEVC spec equation 7-59. Both operands are u8, so when delta_idx_minus1 + 1 exceeds the current index the subtraction wraps and the subsequent array access at calculated_rps_st_sets[ref_rps_idx] reads far out of bounds. A userspace V4L2 client that can open the RKVDEC m2m decoder can submit an EXT_SPS_ST_RPS control with INTER_REF_PIC_SET_PRED set and delta_idx_minus1 crafted to trigger the underflow. Reject the entry early when the reference index would underflow.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From c9a59dc2acc72789d5c778af080d1e65af84862c · fixed in 74938f83a8abbee8f502dfb5d94213b2497d1edf; From c9a59dc2acc72789d5c778af080d1e65af84862c · fixed in 052c5ed5a1d96a6b24fd50ccda16fc6841ee7ca3
- Linux Linux
7.0
- KernelLinux
From 7.0.0 · fixed in 7.2.5