CVE-2024-53174

SUNRPC: make sure cache entry active before cache_show

State: Published
Severity: 7.8 High
Published: Dec 27, 2024
Updated: Aug 5, 2026
Reserved: Nov 19, 2024

Description

In the Linux kernel, the following vulnerability has been resolved:

SUNRPC: make sure cache entry active before cache_show

The function `c_show` was called with protection from RCU. This only ensures that `cp` will not be freed. Therefore, the reference count for `cp` can drop to zero, which will trigger a refcount use-after-free warning when `cache_get` is called. To resolve this issue, use `cache_get_rcu` to ensure that `cp` remains active.

------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 7 PID: 822 at lib/refcount.c:25 refcount_warn_saturate+0xb1/0x120 CPU: 7 UID: 0 PID: 822 Comm: cat Not tainted 6.12.0-rc3+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:refcount_warn_saturate+0xb1/0x120

Call Trace: <TASK> c_show+0x2fc/0x380 [sunrpc] seq_read_iter+0x589/0x770 seq_read+0x1e5/0x270 proc_reg_read+0xe1/0x140 vfs_read+0x125/0x530 ksys_read+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	d48cf356a13073853f19be6ca5ebbecfc2762ebe to before e9be26735d055c42543a4d047a769cc6d0fb1504Affected d48cf356a13073853f19be6ca5ebbecfc2762ebe to before 02999e135b013d85c6df738746e8e24699befee4Affected d48cf356a13073853f19be6ca5ebbecfc2762ebe to before c7dac3af57e38b2054f990e573256d90bf887958Affected d48cf356a13073853f19be6ca5ebbecfc2762ebe to before 068c0b50f3f700b94f78850834cd91ae3b34c2c1Affected d48cf356a13073853f19be6ca5ebbecfc2762ebe to before acfaf37888e0f0732fb6a50ff093dce6d99994d0Affected d48cf356a13073853f19be6ca5ebbecfc2762ebe to before ec305f303bf070b4f6896b7a76009f702956d402Affected d48cf356a13073853f19be6ca5ebbecfc2762ebe to before d882e2b7fad3f5e5fac66184a347f408813f654aAffected d48cf356a13073853f19be6ca5ebbecfc2762ebe to before 2862eee078a4d2d1f584e7f24fa50dddfa5f3471Affected
LinuxLinux	4.20Affected before 4.20Not affected 5.4.287 through 5.4.Not affected 5.10.231 through 5.10.Not affected 5.15.174 through 5.15.Not affected 6.1.120 through 6.1.Not affected 6.6.64 through 6.6.Not affected 6.11.11 through 6.11.Not affected 6.12.2 through 6.12.*Not affected 6.13 and laterNot affected

Product

Versions

LinuxLinux

d48cf356a13073853f19be6ca5ebbecfc2762ebe to before e9be26735d055c42543a4d047a769cc6d0fb1504Affected
d48cf356a13073853f19be6ca5ebbecfc2762ebe to before 02999e135b013d85c6df738746e8e24699befee4Affected
d48cf356a13073853f19be6ca5ebbecfc2762ebe to before c7dac3af57e38b2054f990e573256d90bf887958Affected
d48cf356a13073853f19be6ca5ebbecfc2762ebe to before 068c0b50f3f700b94f78850834cd91ae3b34c2c1Affected
d48cf356a13073853f19be6ca5ebbecfc2762ebe to before acfaf37888e0f0732fb6a50ff093dce6d99994d0Affected
d48cf356a13073853f19be6ca5ebbecfc2762ebe to before ec305f303bf070b4f6896b7a76009f702956d402Affected
d48cf356a13073853f19be6ca5ebbecfc2762ebe to before d882e2b7fad3f5e5fac66184a347f408813f654aAffected
d48cf356a13073853f19be6ca5ebbecfc2762ebe to before 2862eee078a4d2d1f584e7f24fa50dddfa5f3471Affected

LinuxLinux

4.20Affected
before 4.20Not affected
5.4.287 through 5.4.*Not affected
5.10.231 through 5.10.*Not affected
5.15.174 through 5.15.*Not affected
6.1.120 through 6.1.*Not affected
6.6.64 through 6.6.*Not affected
6.11.11 through 6.11.*Not affected
6.12.2 through 6.12.*Not affected
6.13 and laterNot affected

References

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