zram: fix use-after-free in zram_bvec_write_partial()
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 6.6.143, 6.12.94, 6.18.36, 7.0.13
- 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
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
In the Linux kernel, the following vulnerability has been resolved: zram: fix use-after-free in zram_bvec_write_partial() zram_read_page() picks the sync or async backing device read path based on whether the parent bio is NULL. zram_bvec_write_partial() passes its parent bio down, so for ZRAM_WB slots the read is dispatched asynchronously and zram_read_page() returns 0 while the bio is still in flight. The caller then runs memcpy_from_bvec(), zram_write_page() and __free_page() on the buffer, leaving the async read to write into a freed page. zram_bvec_read_partial() was switched to NULL in commit 4e3c87b9421d ("zram: fix synchronous reads") for the same reason; the write_partial counterpart was missed.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From 8e654f8fbff52ac483fb69957222853d7e2fc588 · fixed in 0c2821665ff71be3f4b07ecece384669f2877f6a; From 8e654f8fbff52ac483fb69957222853d7e2fc588 · fixed in 77a602b505ce4802915853cfc435a4722fab3e64; From 8e654f8fbff52ac483fb69957222853d7e2fc588 · fixed in c96786d6ff1acc1d54d9241e97767554c1dfdd5b; From 8e654f8fbff52ac483fb69957222853d7e2fc588 · fixed in 198b5a14cca27263b9c14b20114c8092de15dfcb; From 8e654f8fbff52ac483fb69957222853d7e2fc588 · fixed in 732fd9f0b9c1cdc6dfd77162ded60df005182cc0
- Linux Linux
4.14
- KernelLinux
From 4.14.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.94; From 6.13.0 · fixed in 6.18.36; From 6.19.0 · fixed in 7.0.13