CVE-2023-52699
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.
Does this matter?
Lower severity and a low EPSS score (0.97%). Track it; it rarely justifies an emergency change on its own.
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).
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- EPSS
- 0.97% probability · 60th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-667
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/13b33feb2ebddc2b1aa607f553566b18a4af1d76Patch
- https://git.kernel.org/stable/c/1b4fe801b5bedec2b622ddb18e5c9bf26c63d79fPatch
- https://git.kernel.org/stable/c/53cb1e52c9db618c08335984d1ca80db220ccf09Patch
- https://git.kernel.org/stable/c/674c1c4229e743070e09db63a23442950ff000d1Patch
- https://git.kernel.org/stable/c/89e8524135a3902e7563a5a59b7b5ec1bf4904acPatch
- https://git.kernel.org/stable/c/a69224223746ab96d43e5db9d22d136827b7e2d3Patch
- https://git.kernel.org/stable/c/f123dc86388cb669c3d6322702dc441abc35c31ePatch
- https://git.kernel.org/stable/c/fd203d2c671bdee9ab77090ff394d3b71b627927Patch
- https://git.kernel.org/stable/c/13b33feb2ebddc2b1aa607f553566b18a4af1d76Patch
- https://git.kernel.org/stable/c/1b4fe801b5bedec2b622ddb18e5c9bf26c63d79fPatch
- https://git.kernel.org/stable/c/53cb1e52c9db618c08335984d1ca80db220ccf09Patch
- https://git.kernel.org/stable/c/674c1c4229e743070e09db63a23442950ff000d1Patch
- https://git.kernel.org/stable/c/89e8524135a3902e7563a5a59b7b5ec1bf4904acPatch
- https://git.kernel.org/stable/c/a69224223746ab96d43e5db9d22d136827b7e2d3Patch
- https://git.kernel.org/stable/c/f123dc86388cb669c3d6322702dc441abc35c31ePatch
- https://git.kernel.org/stable/c/fd203d2c671bdee9ab77090ff394d3b71b627927Patch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlMailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.