Medium 5.3Published May 19, 2024

CVE-2023-52699sysv: don't call sb_bread() with pointers_lock held

Updated under an hour ago (Oct 26, 2026, 1:30 PM ET)

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Exploited in the last 30 days

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).

CVSS: 5.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 13b33feb2ebddc2b1aa607f553566b18a4af1d76; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 builds before 1b4fe801b5bedec2b622ddb18e5c9bf26c63d79f; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 674c1c4229e743070e09db63a23442950ff000d1; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before fd203d2c671bdee9ab77090ff394d3b71b627927; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 53cb1e52c9db618c08335984d1ca80db220ccf09; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 89e8524135a3902e7563a5a59b7b5ec1bf4904ac; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a69224223746ab96d43e5db9d22d136827b7e2d3; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f123dc86388cb669c3d6322702dc441abc35c31e	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
linux linux_kernel linux:linux_kernel	before 4.19.312; from 4.20 before 5.4.274; from 5.5 before 5.10.215; from 5.11 before 5.15.155; from 5.16 before 6.1.86; from 6.2 before 6.6.27; from 6.7 before 6.8.6	NVD
debian debian_linux debian:debian_linux	10.0	NVD

References

References

https://git.kernel.org/stable/c/13b33feb2ebddc2b1aa607f553566b18a4af1d76	patch
https://git.kernel.org/stable/c/1b4fe801b5bedec2b622ddb18e5c9bf26c63d79f	patch
https://git.kernel.org/stable/c/674c1c4229e743070e09db63a23442950ff000d1	patch
https://git.kernel.org/stable/c/fd203d2c671bdee9ab77090ff394d3b71b627927	patch
https://git.kernel.org/stable/c/53cb1e52c9db618c08335984d1ca80db220ccf09	patch
https://git.kernel.org/stable/c/89e8524135a3902e7563a5a59b7b5ec1bf4904ac	patch
https://git.kernel.org/stable/c/a69224223746ab96d43e5db9d22d136827b7e2d3	patch
https://git.kernel.org/stable/c/f123dc86388cb669c3d6322702dc441abc35c31e	patch
https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html	mailing-list, third-party-advisory
https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html	mailing-list, third-party-advisory
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.