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CVE-2023-52699

sysv: don't call sb_bread() with pointers_lock held

Medium5.3EPSS 0.97%
Published
Updated
Reserved
Assigned by
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: sysv: don't call sb_bread() with pointers_lock held syzbot is reporting sleep in atomic context in SysV filesystem [1], for sb_bread() is called with rw_spinlock held. A "write_lock(&pointers_lock) => read_lock(&pointers_lock) deadlock" bug and a "sb_bread() with write_lock(&pointers_lock)" bug were introduced by "Replace BKL for chain locking with sysvfs-private rwlock" in Linux 2.5.12. Then, "[PATCH] err1-40: sysvfs locking fix" in Linux 2.6.8 fixed the former bug by moving pointers_lock lock to the callers, but instead introduced a "sb_bread() with read_lock(&pointers_lock)" bug (which made this problem easier to hit). Al Viro suggested that why not to do like get_branch()/get_block()/ find_shared() in Minix filesystem does. And doing like that is almost a revert of "[PATCH] err1-40: sysvfs locking fix" except that get_branch() from with find_shared() is called without write_lock(&pointers_lock).

Timeline

  1. ID reserved

    By Linux

  2. · 2 months later

    Published

  3. · 2 years 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-2023-52699, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVDNVD · Modified3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS (exploitation in 30 days)
0.97% · top 38% of all CVEs (7 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 5.3.

Weakness

Affected products

  • Linux · Linux

    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 13b33feb2ebddc2b1aa607f553566b18a4af1d76
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 1b4fe801b5bedec2b622ddb18e5c9bf26c63d79f
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 674c1c4229e743070e09db63a23442950ff000d1
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < fd203d2c671bdee9ab77090ff394d3b71b627927
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 53cb1e52c9db618c08335984d1ca80db220ccf09
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 89e8524135a3902e7563a5a59b7b5ec1bf4904ac
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < a69224223746ab96d43e5db9d22d136827b7e2d3
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < f123dc86388cb669c3d6322702dc441abc35c31e

  • Linux · Linux

    • affected 2.6.12
    • unaffected < 2.6.12
    • unaffected 4.19.312 – ≤ 4.19.*
    • unaffected 5.4.274 – ≤ 5.4.*
    • unaffected 5.10.215 – ≤ 5.10.*
    • unaffected 5.15.155 – ≤ 5.15.*
    • unaffected 6.1.86 – ≤ 6.1.*
    • unaffected 6.6.27 – ≤ 6.6.*
    • unaffected 6.8.6 – ≤ 6.8.*
    • unaffected 6.9 – ≤ *

References (11)

Sources

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

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Record last updated .