5.5

CVE-2025-21736

nilfs2: fix possible int overflows in nilfs_fiemap()

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 2.6.38 < 6.1.129
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.78
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.14
Linux ≫ Linux Kernel Version >= 6.13 < 6.13.3
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.22% 0.12
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-190 Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

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