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CVE-2024-35844f2fs: compress: fix reserve_cblocks counting error when out of space

Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: compress: fix reserve_cblocks counting error when out of space When a file only needs one direct_node, performing the following operations will cause the file to be unrepairable: unisoc # ./f2fs_io compress test.apk unisoc #df -h | grep dm-48 /dev/block/dm-48 112G 112G 1.2M 100% /data unisoc # ./f2fs_io release_cblocks test.apk 924 unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 4.8M 100% /data unisoc # dd if=/dev/random of=file4 bs=1M count=3 3145728 bytes (3.0 M) copied, 0.025 s, 120 M/s unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 1.8M 100% /data unisoc # ./f2fs_io reserve_cblocks test.apk F2FS_IOC_RESERVE_COMPRESS_BLOCKS failed: No space left on device adb reboot unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 11M 100% /data unisoc # ./f2fs_io reserve_cblocks test.apk 0 This is because the file has only one direct_node. After returning to -ENOSPC, reserved_blocks += ret will not be executed. As a result, the reserved_blocks at this time is still 0, which is not the real number of reserved blocks. Therefore, fsck cannot be set to repair the file. After this patch, the fsck flag will be set to fix this problem. unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 1.8M 100% /data unisoc # ./f2fs_io reserve_cblocks test.apk F2FS_IOC_RESERVE_COMPRESS_BLOCKS failed: No space left on device adb reboot then fsck will be executed unisoc # df -h | grep dm-48 /dev/block/dm-48 112G 112G 11M 100% /data unisoc # ./f2fs_io reserve_cblocks test.apk 924

Timeline

  1. ID reserved

    By Linux

  2. Published

  3. · 24 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2024-35844, by who scored it
Scored byCVSSScoreVector
NVDNVD · Analyzed3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.24% · top 84% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected c75488fb4d82b697f381f855bf5b16779df440aa – < fa3ac8b1a227d9b470b87972494293348b5839ee
    • affected c75488fb4d82b697f381f855bf5b16779df440aa – < 889846dfc8ee2cf31148a44bfd2faeb2faadc685
    • affected c75488fb4d82b697f381f855bf5b16779df440aa – < f0bf89e84c3afb79d7a3a9e4bc853ad6a3245c0a
    • affected c75488fb4d82b697f381f855bf5b16779df440aa – < 569c198c9e2093fd29cc071856a4e548fda506bc
    • affected c75488fb4d82b697f381f855bf5b16779df440aa – < fc0aed88afbf6f606205129a7466eebdf528e3f3
    • affected c75488fb4d82b697f381f855bf5b16779df440aa – < 2f6d721e14b69d6e1251f69fa238b48e8374e25f

  • Linux · Linux

    • affected 5.8
    • unaffected < 5.8
    • unaffected 5.15.153 – ≤ 5.15.*
    • unaffected 6.1.83 – ≤ 6.1.*
    • unaffected 6.6.23 – ≤ 6.6.*
    • unaffected 6.7.11 – ≤ 6.7.*
    • unaffected 6.8.2 – ≤ 6.8.*
    • unaffected 6.9 – ≤ *

References

References8

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .