coresight: ETR: Fix ETR buffer use-after-free issue

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Summary

CVECVE-2025-68376
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-24 11:16:01 UTC
Updated2026-10-21 13:18:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: coresight: ETR: Fix ETR buffer use-after-free issue When ETR is enabled as CS_MODE_SYSFS, if the buffer size is changed and enabled again, currently sysfs_buf will point to the newly allocated memory(buf_new) and free the old memory(buf_old). But the etr_buf that is being used by the ETR remains pointed to buf_old, not updated to buf_new. In this case, it will result in a memory use-after-free issue. Fix this by checking ETR's mode before updating and releasing buf_old, if the mode is CS_MODE_SYSFS, then skip updating and releasing it.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bd2767ec3df2775bc336f441f9068a989ccb919d 5d5d130835b417c7bfd6c942f0149e34397d4463 git Not specified
CNA Linux Linux affected bd2767ec3df2775bc336f441f9068a989ccb919d 4e83434247ff8005a0b9a1ee997864abf8f259ec git Not specified
CNA Linux Linux affected bd2767ec3df2775bc336f441f9068a989ccb919d 70acbc9c77686b7a521af6d7a543dcd9c324cf07 git Not specified
CNA Linux Linux affected bd2767ec3df2775bc336f441f9068a989ccb919d cda077a19f5c8d6ec61e5b97deca203d95e3a422 git Not specified
CNA Linux Linux affected bd2767ec3df2775bc336f441f9068a989ccb919d 35501ac3c7d40a7bb9568c2f89d6b56beaf9bed3 git Not specified
CNA Linux Linux affected fdd3ceb0001da6768bede9779a0190a42e65c404 git Not specified
CNA Linux Linux affected 6.5.8 6.6 semver Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.114 6.12.* semver Not specified
CNA Linux Linux unaffected 6.17.13 6.17.* semver Not specified
CNA Linux Linux unaffected 6.18.2 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5d5d130835b417c7bfd6c942f0149e34397d4463 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/70acbc9c77686b7a521af6d7a543dcd9c324cf07 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cda077a19f5c8d6ec61e5b97deca203d95e3a422 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/35501ac3c7d40a7bb9568c2f89d6b56beaf9bed3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4e83434247ff8005a0b9a1ee997864abf8f259ec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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