CVE-2025-21736

nilfs2: fix possible int overflows in nilfs_fiemap()

EPSS 0.2%

Vexday Risk Score

3Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS —EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

27 Feb 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix possible int overflows in nilfs_fiemap() Since nilfs_bmap_lookup_contig() in nilfs_fiemap() calculates its result by being prepared to go through potentially maxblocks == INT_MAX blocks, the value in n may experience an overflow caused by left shift of blkbits. While it is extremely unlikely to occur, play it safe and cast right hand expression to wider type to mitigate the issue. Found by Linux Verification Center (linuxtesting.org) with static analysis tool SVACE.

Affected products

Linux · Linux

References

https://git.kernel.org/stable/c/250423300b4b0335918be187ef3cade248c06e6a https://git.kernel.org/stable/c/58b1c6881081f5ddfb9a14dc241a74732c0f855c https://git.kernel.org/stable/c/6438ef381c183444f7f9d1de18f22661cba1e946 https://git.kernel.org/stable/c/7649937987fed51ed09985da4019d50189fc534e https://git.kernel.org/stable/c/8f41df5fd4c11d26e929a85f7239799641f92da7 https://git.kernel.org/stable/c/b9495a9109abc31d3170f7aad7d48aa64610a1a2 https://git.kernel.org/stable/c/f2bd0f1ab47822fe5bd699c8458b896c4b2edea1 https://git.kernel.org/stable/c/f3d80f34f58445355fa27b9579a449fb186aa64e https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html