xfrm: fix stale skb->prev after async crypto steals a GSO segment
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.160, 6.12.114, 6.18.42, 7.1.6
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: total
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: fix stale skb->prev after async crypto steals a GSO segment skb_gso_segment() leaves the segment list head with ->prev pointing at the last segment, an invariant validate_xmit_skb_list() relies on when it sets its tail pointer (tail = skb->prev). When validate_xmit_xfrm() walks a GSO list and some segments are stolen by async crypto (->xmit() returns -EINPROGRESS), those segments are unlinked from the list but the head ->prev is never updated. If the last segment is the one stolen, the returned head still has ->prev pointing at it, even though it is now owned by the crypto engine and may be freed. validate_xmit_skb_list() later does tail->next = skb, writing through that stale pointer -- a use-after-free. Repoint skb->prev at the last retained segment before returning.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From f53c723902d1ac5f0b0a11d7c9dcbff748dde74e · fixed in 4927ab8a8acc8db4fad33e803d1d35e0b16cef83; From f53c723902d1ac5f0b0a11d7c9dcbff748dde74e · fixed in b58731e0570bfd3989999fc2baf9ee4fecd5bec6; From f53c723902d1ac5f0b0a11d7c9dcbff748dde74e · fixed in 33e1b0d25ca0d2818c635ff80e6aa0d295e08a98; From f53c723902d1ac5f0b0a11d7c9dcbff748dde74e · fixed in bbca7cc3b2b4b10afbfee99b81d9ee78f5423046; From f53c723902d1ac5f0b0a11d7c9dcbff748dde74e · fixed in 3f4c3919baf0944ad96580467c302bc6c7758b00
- Linux Linux
4.16
- KernelLinux
From 4.16.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.114; From 6.13.0 · fixed in 6.18.42; From 6.19.0 · fixed in 7.1.6