CVE-2024-43856

dma: fix call order in dmam_free_coherent

State: Published
Severity: 7.8 High
Published: Aug 17, 2024
Updated: Oct 15, 2026
Reserved: Aug 17, 2024

Description

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

dma: fix call order in dmam_free_coherent

dmam_free_coherent() frees a DMA allocation, which makes the freed vaddr available for reuse, then calls devres_destroy() to remove and free the data structure used to track the DMA allocation. Between the two calls, it is possible for a concurrent task to make an allocation with the same vaddr and add it to the devres list.

If this happens, there will be two entries in the devres list with the same vaddr and devres_destroy() can free the wrong entry, triggering the WARN_ON() in dmam_match.

Fix by destroying the devres entry before freeing the DMA allocation.

kokonut //net/encryption http://sponge2/b9145fe6-0f72-4325-ac2f-a84d81075b03

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

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before fe2d246080f035e0af5793cb79067ba125e4fb63Affected 9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before 2f7bbdc744f2e7051d1cb47c8e082162df1923c9Affected 9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before 257193083e8f43907e99ea633820fc2b3bcd24c7Affected 9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before 87b34c8c94e29fa01d744e5147697f592998d954Affected 9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before f993a4baf6b622232e4c190d34c220179e5d61ebAffected 9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before 1fe97f68fce1ba24bf823bfb0eb0956003473130Affected 9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before 22094f5f52e7bc16c5bf9613365049383650b02eAffected 9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before 28e8b7406d3a1f5329a03aa25a43aa28e087cb20Affected
LinuxLinux	2.6.21Affected before 2.6.21Not affected 4.19.320 through 4.19.Not affected 5.4.282 through 5.4.Not affected 5.10.224 through 5.10.Not affected 5.15.165 through 5.15.Not affected 6.1.103 through 6.1.Not affected 6.6.44 through 6.6.Not affected 6.10.3 through 6.10.*Not affected 6.11 and laterNot affected

Product

Versions

LinuxLinux

9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before fe2d246080f035e0af5793cb79067ba125e4fb63Affected
9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before 2f7bbdc744f2e7051d1cb47c8e082162df1923c9Affected
9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before 257193083e8f43907e99ea633820fc2b3bcd24c7Affected
9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before 87b34c8c94e29fa01d744e5147697f592998d954Affected
9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before f993a4baf6b622232e4c190d34c220179e5d61ebAffected
9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before 1fe97f68fce1ba24bf823bfb0eb0956003473130Affected
9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before 22094f5f52e7bc16c5bf9613365049383650b02eAffected
9ac7849e35f705830f7b016ff272b0ff1f7ff759 to before 28e8b7406d3a1f5329a03aa25a43aa28e087cb20Affected

LinuxLinux

2.6.21Affected
before 2.6.21Not affected
4.19.320 through 4.19.*Not affected
5.4.282 through 5.4.*Not affected
5.10.224 through 5.10.*Not affected
5.15.165 through 5.15.*Not affected
6.1.103 through 6.1.*Not affected
6.6.44 through 6.6.*Not affected
6.10.3 through 6.10.*Not affected
6.11 and laterNot affected

References

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