by Kastro
Paper/Archive/CVE-2023-53360

CVE-2023-53360

Linux Linux — NFSv4.2: Rework scratch handling for READ_PLUS (again)

EPSS 0.4%CVSS 9.8
critical.is priorityof 100
37
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 35.3.353 × 207.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

In the Linux kernel, the following vulnerability has been resolved: NFSv4.2: Rework scratch handling for READ_PLUS (again) I found that the read code might send multiple requests using the same nfs_pgio_header, but nfs4_proc_read_setup() is only called once. This is how we ended up occasionally double-freeing the scratch buffer, but also means we set a NULL pointer but non-zero length to the xdr scratch buffer. This results in an oops the first time decoding needs to copy something to scratch, which frequently happens when decoding READ_PLUS hole segments. I fix this by moving scratch handling into the pageio read code. I provide a function to allocate scratch space for decoding read replies, and free the scratch buffer when the nfs_pgio_header is freed.

Affected

ProductAffectedFixed inSource
Linux886959f425b6a936a30b82a297ae3aecb3b8230f – < adac9f0ddd2b291c7ce41f549fdb27a13616cff5adac9f0ddd2b291c7ce41f549fdb27a13616cff5CNA
Linuxfbd2a05f29a95d5b42b294bf47e55a711424965b – < a2f4cb206bd94b3f4a7bb05fcdce9525283b5681a2f4cb206bd94b3f4a7bb05fcdce9525283b5681CNA
Linuxfbd2a05f29a95d5b42b294bf47e55a711424965b – < ae5d5672f1db711e91db6f52df5cb16ecd8f5692ae5d5672f1db711e91db6f52df5cb16ecd8f5692CNA
Linuxfbd2a05f29a95d5b42b294bf47e55a711424965b – < 303a78052091c81e9003915c521fdca1c7e117af303a78052091c81e9003915c521fdca1c7e117afCNA
Linux6.46.4.16CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADP5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgit.kernel.org/stable/c/adac9f0ddd2b291c7ce41f549fdb27a13616cff5refgit.kernel.org/stable/c/a2f4cb206bd94b3f4a7bb05fcdce9525283b5681refgit.kernel.org/stable/c/ae5d5672f1db711e91db6f52df5cb16ecd8f5692refgit.kernel.org/stable/c/303a78052091c81e9003915c521fdca1c7e117af